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RFC 4011

 
 
 

Policy Based Management MIB

Part 3 of 4, p. 59 to 89
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8.3.  Utility Library Functions

   Utility Library Functions are provided to enable more efficient
   policy scripts.

8.3.1.  regexp()

      integer regexp(string pattern, string str,
                     integer case [, string &match])

         regexp searches 'str' for matches to the regular expression
         given in `pattern`.  regexp uses the POSIX extended regular
         expressions defined in POSIX 1003.2.

         If `case` is 0, the search will be case insensitive; otherwise,
         it will be case sensitive.

         If a match is found, 1 is returned, otherwise 0 is returned.

         If the optional argument 'match' is provided and a match is
         found, 'match' will be replaced with the text of the first
         substring of 'str' that matches 'pattern'.  If no match is
         found, it will be unchanged.

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8.3.2.  regexpReplace()

      string regexpReplace(string pattern, string replacement,
                            string str, integer case)

         regexpReplace searches 'str' for matches to the regular
         expression given in 'pattern', replacing each occurrence of
         matched text with 'replacement'.  regexpReplace uses the POSIX
         extended regular expressions defined in POSIX 1003.2.

         If `case` is 0, the search will be case insensitive; otherwise,
         it will be case sensitive.

         The modified string is returned (it would be the same as the
         original string if no matches were found).

8.3.3.  oidlen()

      integer oidlen(string oid)

         oidlen returns the number of subidentifiers in 'oid'.  'oid' is
         a string containing an ASCII dotted-decimal representation of
         an object identifier (e.g., "1.3.6.1.2.1.1.1.0").

8.3.4.  oidncmp()

      integer oidncmp(string oid1, string oid2, integer n)

         Arguments 'oid1' and 'oid2' are strings containing ASCII
         dotted-decimal representations of object identifiers (e.g.,
         "1.3.6.1.2.1.1.1.0").

         oidcmp compares not more than n subidentifiers of 'oid1' and
         'oid2' and returns -1 if 'oid1' is less than 'oid2', 0 if they
         are equal, and 1 if 'oid1' is greater than 'oid2'.

8.3.5.  inSubtree()

      integer inSubtree(string oid, string prefix)

         Arguments 'oid' and 'prefix' are strings containing ASCII
         dotted-decimal representations of object identifiers (e.g.,
         "1.3.6.1.2.1.1.1.0").

         inSubtree returns 1 if every subidentifier in 'prefix' equals
         the corresponding subidentifier in 'oid', otherwise it returns
         0.  The is equivalent to oidncmp(oid1, prefix, oidlen(prefix))

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         is provided because this is an idiom and because it avoids
         evaluating 'prefix' twice if it is an expression.

8.3.6.  subid()

      integer subid(string oid, integer n)

         subid returns the value of the nth (starting at zero)
         subidentifier of 'oid'.  'oid' is a string containing an ASCII
         dotted-decimal representation of an object identifier (e.g.,
         "1.3.6.1.2.1.1.1.0").

         If n specifies a subidentifier beyond the length of 'oid', a
         value of -1 is returned.

8.3.7.  subidWrite()

      integer subidWrite(string oid, integer n, integer subid)

         subidWrite sets the value of the nth (starting at zero)
         subidentifier of 'oid' to 'subid'.  'oid' is a string
         containing an ASCII dotted-decimal representation of an object
         identifier (e.g., "1.3.6.1.2.1.1.1.0").

         If n specifies a subidentifier beyond the length of 'oid', a
         value of -1 is returned.  Note that appending subidentifiers
         can be accomplished with the string concatenation '+' operator.
         If no error occurs, zero is returned.

8.3.8.  oidSplice()

      string oidSplice(string oid1, integer offset, integer len, string
         oid2)

         oidSplice returns an OID formed by replacing 'len'
         subidentifiers in 'oid1' with all of the subidentifiers from
         'oid2', starting at 'offset' in 'oid1' (the first subidentifier
         is at offset 0).  The OID length will be extended, if
         necessary, if 'offset' + 'len' extends beyond the end of
         'oid1'.  If 'offset' is larger than the length of oid1, then an
         RTE will occur.

         The resulting OID is returned.

         For example:
             oidSplice("1.3.6.1.2.1", 5, 1, "7")     => "1.3.6.1.2.7"
             oidSplice("1.3.6.1.2.1", 4, 2, "7.7")   => "1.3.6.1.7.7"
             oidSplice("1.3.6.1.2.1", 4, 3, "7.7.7") => "1.3.6.1.7.7.7"

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8.3.9.  parseIndex()

   ParseIndex is provided to make it easy to pull index values from OIDs
   into variables.

      var parseIndex(string oid, integer &index, integer type,
                     integer len)

         parseIndex pulls values from the instance identification
         portion of 'oid', encoded as per Section 7.7, "Mapping of the
         INDEX Clause", of the SMIv2 [2].

         'oid' is the OID to be parsed.

         'index' describes which subid to begin parsing at.  'index'
         will be modified to indicate the subid after the last one
         parsed (even if this points past the last subid).  The first
         subid is index 0.  If any error occurs, 'index' will be set to
         -1 on return.  If the input index is less than 0 or refers past
         the end of the OID, 'index' will be set to -1 on return and the
         function will return 0.

         If 'type' is Integer, 'len' will not be consulted.  The return
         value is the integer value of the next subid.

         If 'type' is String and 'len' is greater than zero, 'len'
         subids will be parsed.  For each subid parsed, the chr() value
         of the subid will be appended to the returned string.  If any
         subid is greater than 255, 'index' will be set to -1 on return,
         and an empty string will be returned.  If there are fewer than
         'len' subids left in 'oid', 'index' will be set to -1 on
         return, but a string will be returned containing a character
         for each subid that was left.

         If 'type' is String and 'len' is zero, the next subid will be
         parsed to find N, the length of the string.  Then, that many
         subids will be parsed.  For each subid parsed, the chr() value
         of the subid will be appended to the returned string.  If any
         subid is greater than 255, 'index' will be set to -1 on return,
         and an empty string will be returned.  If there are fewer than
         N subids left in 'oid', 'index' will be set to -1 on return,
         but a string will be returned containing a character for each
         subid that was left.

         If 'type' is String and 'len' is -1, subids will be parsed
         until the end of 'oid'.  For each subid parsed, the chr() value
         of the subid will be appended to the returned string.  If any

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         subid is greater than 255, 'index' will be set to -1 on return,
         and an empty string will be returned.

         If 'type' is Oid and 'len' is greater than zero, 'len' subids
         will be parsed.  For each subid parsed, the decimal-encoded
         value of the subid will be appended to the returned string,
         with a '.' character appended between each output subid, but
         not after the last subid.  If there are fewer than 'len' subids
         left in 'oid', 'index' will be set to -1 on return, but a
         string will be returned containing an encoding for each subid
         that was left.

         If 'type' is Oid and 'len' is zero, the next subid will be
         parsed to find N, the number of subids to parse.  For each
         subid parsed, the decimal-encoded value of the subid will be
         appended to the returned string, with a '.' character appended
         between each output subid but not after the last subid.  If
         there are fewer than N subids left in 'oid', 'index' will be
         set to -1 on return, but a string will be returned containing
         an encoding for each subid that was left.

         If 'type' is Oid and 'len' is -1, subids will be parsed until
         the end of 'oid'.  For each subid parsed, the decimal-encoded
         value of the subid will be appended to the returned string,
         with a '.' character appended between each output subid, but
         not after the last subid.

   For example, to decode the index component of an instance of the
   ipForward table:

      oid = "ipForwardIfIndex.0.0.0.0.13.0.192.168.1.1";
      index = 11;
      dest   =  parseIndex(oid, index, String, 4);
      proto  =  parseIndex(oid, index, Integer, 0);
      policy =  parseIndex(oid, index, Integer, 0);
      nextHop = parseIndex(oid, index, String, 4);
      // proto and policy now contain integer values
      // dest and nextHop now contain 4 byte IP addresses.  Use
      // stringToDotted to get them to dotted decimal notation:
      // e.g.: stringToDotted(nextHop) => "192.168.1.1"

8.3.10.  stringToDotted()

   stringToDotted() is provided to encode strings suitable for the index
   portion of an OID or to convert the binary encoding of an IP address
   to a dotted-decimal encoding.

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      string stringToDotted(string value)

         If 'value' is the zero-length string, the zero-length string is
         returned.

         The decimal encoding of the first byte of 'value' is appended
         to the output string.  Then, for each additional byte in
         'value', a '.' is appended to the output string, followed by
         the decimal encoding of the additional byte.

8.3.11.  integer()

      integer integer(var input)

         integer converts 'input' into an integer by using the rules
         specified for ToInteger(), returning the integer-typed results.

8.3.12.  string()

      string string(var input)

         string converts 'input' into a string by using the rules
         specified for ToString(), returning the string-typed results.

8.3.13.  type()

      string type(var variable)

         type returns the type of its argument as either the string
         'String' or the string 'Integer'.

8.3.14.  chr()

      string chr(integer char)

         Returns a one-character string containing the character
         specified by the ASCII code contained in 'char'.

8.3.15.  ord()

      integer ord(string str)

         Returns the ASCII value of the first character of 'str'.  This
         function complements chr().

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8.3.16.  substr()

      string substr(string &str, integer offset
                    [, integer len, string replacement])

         Extracts a substring out of 'str' and returns it.  The first
         octet is at offset 0.  If the offset is negative, the returned
         string starts that far from the end of 'str'.  If 'len' is
         positive, the returned string contains up to 'len' octets, up
         to the end of the string.  If 'len' is omitted, the returned
         string includes everything to the end of 'str'.  If 'len' is
         negative, abs(len) octets are left off the end of the string.

         If a substring is specified that is partly outside the string,
         the part within the string is returned.  If the substring is
         totally outside the string, a zero-length string is produced.

         If the optional 'replacement' argument is included, 'str' is
         modified.  'offset' and 'len' act as above to select a range of
         octets in 'str'.  These octets are replaced with octets from
         'replacement'.  If the replacement string is shorter or longer
         than the number of octets selected, 'str' will shrink or grow,
         respectively.  If 'replacement' is included, the 'len' argument
         must also be included.

         Note that to replace everything from offset to the end of the
         string, substr() should be called as follows:

            substr(str, offset, strlen(str) - offset, replacement)

8.4.  General Functions

   The following POSIX standard library functions are provided:

       strncmp()
       strncasecmp()
       strlen()
       random()
       sprintf()
       sscanf()

9.  International String Library

   This library is optional for systems that wish to have support for
   collating (sorting) and verifying equality of international strings
   in a manner that will be least surprising to humans.  International

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   strings are encoded in the UTF-8 transformation format described in
   [14].  This library is registered with the name
   "pmInternationalStringLibrary".

   When verifying equality of international strings in the Unicode
   character set, it is recommended to normalize the strings with the
   stringprep() function before checking for equality.

   When attempting to sort international strings in the Unicode
   character set, normalization should also be performed, but note that
   the result is highly context dependent and hard to implement
   correctly.  Just ordering by Unicode Codepoint Value is in many cases
   not what the end user expects.  See Unicode technical note 9 for more
   information about sorting.

9.1.  stringprep()

      integer stringprep(string utf8Input, string &utf8Output)

         Performs the Stringprep [13] transformation for appropriate
         comparison of internationalized strings.  The transformation is
         performed on 'utf8Input'; if the transformation finishes
         without error, the resulting string is written to utf8Output.
         The stringprep profile used is specified below in Section 9.
         If it is successful, the function returns 1.

         If the stringprep transformation encounters an error, 0 is
         returned, and the utf8Output parameter remains unchanged.

         For example, to compare UTF8 strings 'one' and 'two':

         if (stringprep(one, a) && stringprep(two, b)){
             if (a == b){
                // strings are identical
             } else {
                // strings are different
             }
         } else {
             // strings couldn't be transformed for comparison
         }

         See Stringprep [13] for more information.

9.1.1.  Stringprep Profile

   The Stringprep specification [13] describes a framework for preparing
   Unicode text strings in order to increase the likelihood that string
   input and string comparison work in ways that make sense for typical

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   users throughout the world.  Specifications that specify stringprep
   (as this one does) are required to fully specify stringprep's
   processing options by documenting a stringprep profile.

   This profile defines the following, as required by Stringprep:

   - The intended applicability of the profile: internationalized
     network management information.

   - The character repertoire that is the input and output to
     stringprep: Unicode 3.2, as defined in Stringprep [13], Appendix
     A.1.

   - The mapping tables used: Table B.1 from Stringprep [13].

   - Any additional mapping tables specific to the profile: None.

   - The Unicode normalization used: Form KC, as described in Stringprep
     [13].

   - The characters that are prohibited as output: As specified in the
     following tables from Stringprep [13]:

       Table C.2
       Table C.3
       Table C.4
       Table C.5
       Table C.6
       Table C.7
       Table C.8
       Table C.9

   - Bidirectional character handling: not performed.

   - Any additional characters that are prohibited as output:  None.

9.2.  utf8Strlen()

      integer utf8Strlen(string str)

         Returns the number of UTF-8 characters in 'str', which may be
         less than the number of octets in 'str' if one or more
         characters are multi-byte characters.

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9.3.  utf8Chr()

      string utf8Chr(integer utf8)

         Returns a one-character string containing the character
         specified by the UTF-8 code contained in 'utf8'.  Although it
         contains only 1 UTF-8 character, the resulting string may be
         more than 1 octet in length.

9.4.  utf8Ord()

      integer utf8Ord(string str)

         Returns the UTF-8 code-point value of the first character of
         'str'.  Note that the first UTF-8 character in 'str' may be
         more than 1 octet in length.  This function complements chr().

9.5.  utf8Substr()

      string utf8Substr(string &str, integer offset
                    [, integer len, string replacement])

         Extracts a substring out of 'str' and returns it, keeping track
         of UTF-8 character boundaries and using them, instead of
         octets, as the basis for offset and length calculations.  The
         first character is at offset 0.  If offset is negative, the
         returned string starts that far from the end of 'str'.  If
         'len' is positive, the returned string contains up to 'len'
         characters, up to the end of the string.  If 'len' is omitted,
         the returned string includes everything to the end of 'str'.
         If 'len' is negative, abs(len) characters are left off the end
         of the string.

         If you specify a substring that is partly outside the string,
         the part within the string is returned.  If the substring is
         totally outside the string, a zero-length string is produced.

         If the optional 'replacement' argument is included, 'str' is
         modified.  'offset' and 'len' act as above to select a range of
         characters in 'str'.  These characters are replaced with
         characters from 'replacement'.  If the replacement string is
         shorter or longer than the number of characters selected, 'str'
         will shrink or grow, respectively.  If 'replacement' is
         included, the 'len' argument must also be included.

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         Note that to replace everything from offset to the end of the
         string, substr() should be called as follows:

            substr(str, offset, strlen(str) - offset, replacement)

10.  Schedule Table

   This table is an adapted form of the policyTimePeriodCondition class
   defined in the Policy Core Information Model, RFC 3060 [18].  Some of
   the objects describing a schedule are expressed in formats defined in
   the iCalendar specification [15].

   The policy schedule table allows control over when a valid policy
   will be ready, based on the date and time.

   A policy's pmPolicySchedule variable refers to a group of one or more
   schedules in the schedule table.  At any given time, if any of these
   schedules are active, the policy will be ready (assuming that it is
   enabled and thus valid), and its conditions and actions will be
   executed, as appropriate.  At times when none of these schedules are
   active, the policy will not be ready and will have no effect.  A
   policy will always be ready if its pmPolicySchedule variable is 0.
   If a policy has a non-zero pmPolicySchedule that doesn't refer to a
   group that includes an active schedule, then the policy will not be
   ready, even if this is due to a misconfiguration of the
   pmPolicySchedule object or the pmSchedTable.

   A policy that is controlled by a schedule group immediately executes
   its policy condition (and conditionally the policyAction) when the
   schedule group becomes active, periodically re-executing these
   scripts as appropriate until the schedule group becomes inactive
   (i.e., all schedules are inactive).

   An individual schedule item is active at those times that match all
   the variables that define the schedule:  pmSchedTimePeriod,
   pmSchedMonth, pmSchedDay, pmSchedWeekDay, and pmSchedTimeOfDay.  It
   is possible to specify multiple values for each schedule item.  This
   provides a mechanism for defining complex schedules.  For example, a
   schedule that is active the entire workday each weekday could be
   defined.

   Months, days, and weekdays are specified by using the objects
   pmSchedMonth, pmSchedDay, and pmSchedWeekDay of type BITS.  Setting
   multiple bits in these objects causes an OR operation.  For example,
   setting the bits monday(1) and friday(5) in pmSchedWeekDay restricts
   the schedule to Mondays and Fridays.

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   The matched times for pmSchedTimePeriod, pmSchedMonth, pmSchedDay
   pmSchedWeekDay, and pmSchedTimeOfDay are ANDed together to determine
   the time periods when the schedule will be active; in other words,
   the schedule is only active for those times when ALL of these
   schedule attributes match.  For example, a schedule with an overall
   validity range of January 1, 2000, through December 31, 2000; a month
   mask that selects March and April; a day-of-the-week mask that
   selects Fridays; and a time-of-day range of 0800 through 1600 would
   represent the following time periods:

      Friday, March  5, 2000, from 0800 through 1600
      Friday, March 12, 2000, from 0800 through 1600
      Friday, March 19, 2000, from 0800 through 1600
      Friday, March 26, 2000, from 0800 through 1600
      Friday, April  2, 2000, from 0800 through 1600
      Friday, April  9, 2000, from 0800 through 1600
      Friday, April 16, 2000, from 0800 through 1600
      Friday, April 23, 2000, from 0800 through 1600
      Friday, April 30, 2000, from 0800 through 1600

   Wildcarding of schedule attributes of type BITS is achieved by
   setting all bits to one.

   It is possible to define schedules that will never cause a policy to
   be activated.  For example, one can define a schedule that should be
   active on February 31st.

11.  Definitions

POLICY-BASED-MANAGEMENT-MIB DEFINITIONS ::= BEGIN
IMPORTS
    MODULE-IDENTITY, OBJECT-TYPE, NOTIFICATION-TYPE,
    Counter32, Gauge32, Unsigned32,
    mib-2                                       FROM SNMPv2-SMI
    RowStatus, RowPointer, TEXTUAL-CONVENTION,
    DateAndTime, StorageType                    FROM SNMPv2-TC
    MODULE-COMPLIANCE, OBJECT-GROUP,
    NOTIFICATION-GROUP                          FROM SNMPv2-CONF
    SnmpAdminString                             FROM SNMP-FRAMEWORK-MIB;

--  Policy-Based Management MIB

pmMib MODULE-IDENTITY
    LAST-UPDATED "200502070000Z"  -- February 7, 2005
    ORGANIZATION "IETF SNMP Configuration Working Group"
    CONTACT-INFO
        "

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        Steve Waldbusser
        Phone: +1-650-948-6500
        Fax:   +1-650-745-0671
        Email: waldbusser@nextbeacon.com

        Jon Saperia (WG Co-chair)
        JDS Consulting, Inc.
        84 Kettell Plain Road.
        Stow MA 01775
        USA
        Phone: +1-978-461-0249
        Fax:   +1-617-249-0874
        Email: saperia@jdscons.com

        Thippanna Hongal
        Riverstone Networks, Inc.
        5200 Great America Parkway
        Santa Clara, CA, 95054
        USA

        Phone: +1-408-878-6562
        Fax:   +1-408-878-6501
        Email: hongal@riverstonenet.com

        David Partain (WG Co-chair)
        Postal: Ericsson AB
                P.O. Box 1248
                SE-581 12 Linkoping
                Sweden
        Tel: +46 13 28 41 44
        E-mail: David.Partain@ericsson.com

        Any questions or comments about this document can also be
        directed to the working group at snmpconf@snmp.com."
    DESCRIPTION
        "The MIB module for policy-based configuration of SNMP
        infrastructures.

        Copyright (C) The Internet Society (2005).  This version of
        this MIB module is part of RFC 4011; see the RFC itself for
        full legal notices."

    REVISION "200502070000Z"    -- February 7, 2005
    DESCRIPTION
        "The original version of this MIB, published as RFC4011."
    ::= { mib-2 124 }

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PmUTF8String ::= TEXTUAL-CONVENTION
    STATUS       current
    DESCRIPTION
        "An octet string containing information typically in
        human-readable form.

        To facilitate internationalization, this
        information is represented by using the ISO/IEC
        IS 10646-1 character set, encoded as an octet
        string using the UTF-8 transformation format
        described in RFC 3629.

        As additional code points are added by
        amendments to the 10646 standard from time
        to time, implementations must be prepared to
        encounter any code point from 0x00000000 to
        0x10FFFF.  Byte sequences that do not
        correspond to the valid UTF-8 encoding of a
        code point or that are outside this range are
        prohibited.

        The use of control codes should be avoided.

        When it is necessary to represent a newline,
        the control code sequence CR LF should be used.

        For code points not directly supported by user
        interface hardware or software, an alternative
        means of entry and display, such as hexadecimal,
        may be provided.

        For information encoded in 7-bit US-ASCII,
        the UTF-8 encoding is identical to the
        US-ASCII encoding.

        UTF-8 may require multiple bytes to represent a
        single character/code point; thus, the length
        of this object in octets may be different from
        the number of characters encoded.  Similarly,
        size constraints refer to the number of encoded
        octets, not the number of characters represented
        by an encoding.

        Note that when this TC is used for an object
        used or envisioned to be used as an index, then
        a SIZE restriction MUST be specified so that the
        number of sub-identifiers for any object instance
        does not exceed the limit of 128, as defined by

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        RFC 3416.

        Note that the size of PmUTF8String object is
        measured in octets, not characters."
       SYNTAX       OCTET STRING (SIZE (0..65535))

-- The policy table

pmPolicyTable OBJECT-TYPE
    SYNTAX      SEQUENCE OF PmPolicyEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "The policy table.  A policy is a pairing of a
        policyCondition and a policyAction that is used to apply the
        action to a selected set of elements."
    ::= { pmMib 1 }

pmPolicyEntry OBJECT-TYPE
    SYNTAX      PmPolicyEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "An entry in the policy table representing one policy."
    INDEX { pmPolicyAdminGroup, pmPolicyIndex }
    ::= { pmPolicyTable 1 }

PmPolicyEntry ::= SEQUENCE {
    pmPolicyAdminGroup            PmUTF8String,
    pmPolicyIndex                 Unsigned32,
    pmPolicyPrecedenceGroup       PmUTF8String,
    pmPolicyPrecedence            Unsigned32,
    pmPolicySchedule              Unsigned32,
    pmPolicyElementTypeFilter     PmUTF8String,
    pmPolicyConditionScriptIndex  Unsigned32,
    pmPolicyActionScriptIndex     Unsigned32,
    pmPolicyParameters            OCTET STRING,
    pmPolicyConditionMaxLatency   Unsigned32,
    pmPolicyActionMaxLatency      Unsigned32,
    pmPolicyMaxIterations         Unsigned32,
    pmPolicyDescription           PmUTF8String,
    pmPolicyMatches               Gauge32,
    pmPolicyAbnormalTerminations  Gauge32,
    pmPolicyExecutionErrors       Counter32,
    pmPolicyDebugging             INTEGER,
    pmPolicyAdminStatus           INTEGER,
    pmPolicyStorageType           StorageType,
    pmPolicyRowStatus             RowStatus

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}

pmPolicyAdminGroup OBJECT-TYPE
    SYNTAX      PmUTF8String (SIZE(0..32))
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "An administratively assigned string that can be used to group
        policies for convenience, for readability, or to simplify
        configuration of access control.

        The value of this string does not affect policy processing in
        any way.  If grouping is not desired or necessary, this object
        may be set to a zero-length string."
    ::= { pmPolicyEntry 1 }

pmPolicyIndex OBJECT-TYPE
    SYNTAX      Unsigned32 (1..4294967295)
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
         "A unique index for this policy entry, unique among all
         policies regardless of administrative group."
    ::= { pmPolicyEntry 2 }

pmPolicyPrecedenceGroup OBJECT-TYPE
    SYNTAX      PmUTF8String (SIZE (0..32))
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "An administratively assigned string that is used to group
        policies.  For each element, only one policy in the same
        precedence group may be active on that element.  If multiple
        policies would be active on an element (because their
        conditions return non-zero), the execution environment will
        only allow the policy with the highest value of
        pmPolicyPrecedence to be active.

        All values of this object must have been successfully
        transformed by Stringprep RFC 3454.  Management stations
        must perform this translation and must only set this object to
        string values that have been transformed."
    ::= { pmPolicyEntry 3 }

pmPolicyPrecedence OBJECT-TYPE
    SYNTAX      Unsigned32 (0..65535)
    MAX-ACCESS  read-create
    STATUS      current

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    DESCRIPTION
        "If, while checking to see which policy conditions match an
        element, 2 or more ready policies in the same precedence group
        match the same element, the pmPolicyPrecedence object provides
        the rule to arbitrate which single policy will be active on
        'this element'.  Of policies in the same precedence group, only
        the ready and matching policy with the highest precedence
        value (e.g., 2 is higher than 1) will have its policy action
        periodically executed on 'this element'.

        When a policy is active on an element but the condition ceases
        to match the element, its action (if currently running) will
        be allowed to finish and then the condition-matching ready
        policy with the next-highest precedence will immediately
        become active (and have its action run immediately).  If the
        condition of a higher-precedence ready policy suddenly begins
        matching an element, the previously-active policy's action (if
        currently running) will be allowed to finish and then the
        higher precedence policy will immediately become active.  Its
        action will run immediately, and any lower-precedence matching
        policy will not be active anymore.

        In the case where multiple ready policies share the highest
        value, it is an implementation-dependent matter as to which
        single policy action will be chosen.

        Note that if it is necessary to take certain actions after a
        policy is no longer active on an element, these actions should
        be included in a lower-precedence policy that is in the same
        precedence group."
    ::= { pmPolicyEntry 4 }

pmPolicySchedule OBJECT-TYPE
    SYNTAX      Unsigned32 (1..4294967295)
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
         "This policy will be ready if any of the associated schedule
         entries are active.

         If the value of this object is 0, this policy is always
         ready.

         If the value of this object is non-zero but doesn't
         refer to a schedule group that includes an active schedule,
         then the policy will not be ready, even if this is due to a
         misconfiguration of this object or the pmSchedTable."
    ::= { pmPolicyEntry 5 }

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pmPolicyElementTypeFilter OBJECT-TYPE
    SYNTAX      PmUTF8String (SIZE (0..128))
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "This object specifies the element types for which this policy
        can be executed.

        The format of this object will be a sequence of
        pmElementTypeRegOIDPrefix values, encoded in the following
        BNF form:

        elementTypeFilter:   oid [ ';' oid ]*
                      oid:   subid [ '.' subid ]*
                    subid:   '0' | decimal_constant

        For example, to register for the policy to be run on all
        interface elements, the 'ifEntry' element type will be
        registered as '1.3.6.1.2.1.2.2.1'.

        If a value is included that does not represent a registered
        pmElementTypeRegOIDPrefix, then that value will be ignored."
    ::= { pmPolicyEntry 6 }

pmPolicyConditionScriptIndex OBJECT-TYPE
    SYNTAX      Unsigned32 (1..4294967295)
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
         "A pointer to the row or rows in the pmPolicyCodeTable that
         contain the condition code for this policy.  When a policy
         entry is created, a pmPolicyCodeIndex value unused by this
         policy's adminGroup will be assigned to this object.

         A policy condition is one or more PolicyScript statements
         that result(s) in a boolean value that represents whether
         an element is a member of a set of elements upon which an
         action is to be performed.  If a policy is ready and the
         condition returns true for an element of a proper element
         type, and if no higher-precedence policy should be active,
         then the policy is active on that element.

         Condition evaluation stops immediately when any run-time
         exception is detected, and the policyAction is not executed.

         The policyCondition is evaluated for various elements.  Any
         element for which the policyCondition returns any nonzero value
         will match the condition and will have the associated

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         policyAction executed on that element unless a
         higher-precedence policy in the same precedence group also
         matches 'this element'.

         If the condition object is empty (contains no code) or
         otherwise does not return a value, the element will not be
         matched.

         When this condition is executed, if SNMP requests are made to
         the local system and secModel/secName/secLevel aren't
         specified, access to objects is under the security
         credentials of the requester who most recently modified the
         associated pmPolicyAdminStatus object.  If SNMP requests are
         made in which secModel/secName/secLevel are specified, then
         the specified credentials are retrieved from the local
         configuration datastore only if VACM is configured to
         allow access to the requester who most recently modified the
         associated pmPolicyAdminStatus object.  See the Security
         Considerations section for more information."
    ::= { pmPolicyEntry 7 }

pmPolicyActionScriptIndex OBJECT-TYPE
    SYNTAX      Unsigned32 (1..4294967295)
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
         "A pointer to the row or rows in the pmPolicyCodeTable that
         contain the action code for this policy.  When a policy entry
         is created, a pmPolicyCodeIndex value unused by this policy's
         adminGroup will be assigned to this object.

         A PolicyAction is an operation performed on a
         set of elements for which the policy is active.

         Action evaluation stops immediately when any run-time
         exception is detected.

         When this condition is executed, if SNMP requests are made to
         the local system and secModel/secName/secLevel aren't
         specified, access to objects is under the security
         credentials of the requester who most recently modified the
         associated pmPolicyAdminStatus object.  If SNMP requests are
         made in which secModel/secName/secLevel are specified, then
         the specified credentials are retrieved from the local
         configuration datastore only if VACM is configured to
         allow access to the requester who most recently modified the
         associated pmPolicyAdminStatus object.  See the Security
         Considerations section for more information."

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    ::= { pmPolicyEntry 8 }

pmPolicyParameters OBJECT-TYPE
    SYNTAX      OCTET STRING (SIZE (0..65535))
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "From time to time, policy scripts may seek one or more
        parameters (e.g., site-specific constants).  These parameters
        may be installed with the script in this object and are
        accessible to the script via the getParameters() function.  If
        it is necessary for multiple parameters to be passed to the
        script, the script can choose whatever encoding/delimiting
        mechanism is most appropriate."
    ::= { pmPolicyEntry 9 }

pmPolicyConditionMaxLatency OBJECT-TYPE
    SYNTAX      Unsigned32 (0..2147483647)
    UNITS       "milliseconds"
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "Every element under the control of this agent is
        re-checked periodically to see whether it is under control
        of this policy by re-running the condition for this policy.
        This object lets the manager control the maximum amount of
        time that may pass before an element is re-checked.

        In other words, in any given interval of this duration, all
        elements must be re-checked.  Note that how the policy agent
        schedules the checking of various elements within this
        interval is an implementation-dependent matter.
        Implementations may wish to re-run a condition more
        quickly if they note a change to the role strings for an
        element."
    ::= { pmPolicyEntry 10 }

pmPolicyActionMaxLatency OBJECT-TYPE
    SYNTAX      Unsigned32 (0..2147483647)
    UNITS       "milliseconds"
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "Every element that matches this policy's condition and is
        therefore under control of this policy will have this policy's
        action executed periodically to ensure that the element
        remains in the state dictated by the policy.
        This object lets the manager control the maximum amount of

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        time that may pass before an element has the action run on
        it.

        In other words, in any given interval of this duration, all
        elements under control of this policy must have the action run
        on them.  Note that how the policy agent schedules the policy
        action on various elements within this interval is an
        implementation-dependent matter."
    ::= { pmPolicyEntry 11 }

pmPolicyMaxIterations OBJECT-TYPE
    SYNTAX      Unsigned32
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "If a condition or action script iterates in loops too many
        times in one invocation, the execution environment may
        consider it in an infinite loop or otherwise not acting
        as intended and may be terminated by the execution
        environment.  The execution environment will count the
        cumulative number of times all 'for' or 'while' loops iterated
        and will apply a threshold to determine when to terminate the
        script.  What threshold the execution environment uses is an
        implementation-dependent manner, but the value of
        this object SHOULD be the basis for choosing the threshold for
        each script.  The value of this object represents a
        policy-specific threshold and can be tuned for policies of
        varying workloads.  If this value is zero, no
        threshold will be enforced except for any
        implementation-dependent maximum.  Regardless of this value,
        the agent is allowed to terminate any script invocation that
        exceeds a local CPU or memory limitation.

        Note that the condition and action invocations are tracked
        separately."
    ::= { pmPolicyEntry 12 }

pmPolicyDescription OBJECT-TYPE
    SYNTAX      PmUTF8String
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
         "A description of this rule and its significance, typically
         provided by a human."
    ::= { pmPolicyEntry 13 }

pmPolicyMatches OBJECT-TYPE
    SYNTAX      Gauge32

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    UNITS       "elements"
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
         "The number of elements that, in their most recent execution
         of the associated condition, were matched by the condition."
    ::= { pmPolicyEntry 14 }

pmPolicyAbnormalTerminations OBJECT-TYPE
    SYNTAX      Gauge32
    UNITS       "elements"
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
         "The number of elements that, in their most recent execution
         of the associated condition or action, have experienced a
         run-time exception and terminated abnormally.  Note that if a
         policy was experiencing a run-time exception while processing
         a particular element but runs normally on a subsequent
         invocation, this number can decline."
    ::= { pmPolicyEntry 15 }

pmPolicyExecutionErrors OBJECT-TYPE
    SYNTAX      Counter32
    UNITS       "errors"
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
         "The total number of times that execution of this policy's
         condition or action has been terminated due to run-time
         exceptions."
    ::= { pmPolicyEntry 16 }

pmPolicyDebugging OBJECT-TYPE
    SYNTAX      INTEGER {
                    off(1),
                    on(2)
                }
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
         "The status of debugging for this policy.  If this is turned
         on(2), log entries will be created in the pmDebuggingTable
         for each run-time exception that is experienced by this
         policy."
    DEFVAL { off }
    ::= { pmPolicyEntry 17 }

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pmPolicyAdminStatus OBJECT-TYPE
    SYNTAX      INTEGER {
                    disabled(1),
                    enabled(2),
                    enabledAutoRemove(3)
                }
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
         "The administrative status of this policy.

         The policy will be valid only if the associated
         pmPolicyRowStatus is set to active(1) and this object is set
         to enabled(2) or enabledAutoRemove(3).

         If this object is set to enabledAutoRemove(3), the next time
         the associated schedule moves from the active state to the
         inactive state, this policy will immediately be deleted,
         including any associated entries in the pmPolicyCodeTable.

         The following related objects may not be changed unless this
         object is set to disabled(1):
             pmPolicyPrecedenceGroup, pmPolicyPrecedence,
             pmPolicySchedule, pmPolicyElementTypeFilter,
             pmPolicyConditionScriptIndex, pmPolicyActionScriptIndex,
             pmPolicyParameters, and any pmPolicyCodeTable row
             referenced by this policy.
         In order to change any of these parameters, the policy must
         be moved to the disabled(1) state, changed, and then
         re-enabled.

         When this policy moves to either enabled state from the
         disabled state, any cached values of policy condition must be
         erased, and any Policy or PolicyElement scratchpad values for
         this policy should be removed.  Policy execution will begin by
         testing the policy condition on all appropriate elements."
    ::= { pmPolicyEntry 18 }

pmPolicyStorageType OBJECT-TYPE
    SYNTAX      StorageType
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "This object defines whether this policy and any associated
         entries in the pmPolicyCodeTable are kept in volatile storage
         and lost upon reboot or if this row is backed up by
         non-volatile or permanent storage.

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         If the value of this object is 'permanent', the values for
         the associated pmPolicyAdminStatus object must remain
         writable."
    ::= { pmPolicyEntry 19 }

pmPolicyRowStatus OBJECT-TYPE
    SYNTAX      RowStatus
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
         "The row status of this pmPolicyEntry.

         The status may not be set to active if any of the related
         entries in the pmPolicyCode table do not have a status of
         active or if any of the objects in this row are not set to
         valid values.  Only the following objects may be modified
         while in the active state:
             pmPolicyParameters
             pmPolicyConditionMaxLatency
             pmPolicyActionMaxLatency
             pmPolicyDebugging
             pmPolicyAdminStatus

         If this row is deleted, any associated entries in the
         pmPolicyCodeTable will be deleted as well."
    ::= { pmPolicyEntry 20 }

-- Policy Code Table

pmPolicyCodeTable OBJECT-TYPE
    SYNTAX      SEQUENCE OF PmPolicyCodeEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "The pmPolicyCodeTable stores the code for policy conditions and
        actions.

        An example of the relationships between the code table and the
        policy table follows:

        pmPolicyTable
            AdminGroup  Index   ConditionScriptIndex  ActionScriptIndex
        A   ''          1       1                     2
        B   'oper'      1       1                     2
        C   'oper'      2       3                     4

        pmPolicyCodeTable
        AdminGroup  ScriptIndex  Segment    Note

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        ''          1            1          Filter for policy A
        ''          2            1          Action for policy A
        'oper'      1            1          Filter for policy B
        'oper'      2            1          Action 1/2 for policy B
        'oper'      2            2          Action 2/2 for policy B
        'oper'      3            1          Filter for policy C
        'oper'      4            1          Action for policy C

        In this example, there are 3 policies: 1 in the '' adminGroup,
        and 2 in the 'oper' adminGroup.  Policy A has been assigned
        script indexes 1 and 2 (these script indexes are assigned out of
        a separate pool per adminGroup), with 1 code segment each for
        the filter and the action.  Policy B has been assigned script
        indexes 1 and 2 (out of the pool for the 'oper' adminGroup).
        While the filter has 1 segment, the action is longer and is
        loaded into 2 segments.  Finally, Policy C has been assigned
        script indexes 3 and 4, with 1 code segment each for the filter
        and the action."
    ::= { pmMib 2 }

pmPolicyCodeEntry OBJECT-TYPE
    SYNTAX      PmPolicyCodeEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "An entry in the policy code table representing one code
        segment.  Entries that share a common AdminGroup/ScriptIndex
        pair make up a single script.  Valid values of ScriptIndex are
        retrieved from pmPolicyConditionScriptIndex and
        pmPolicyActionScriptIndex after a pmPolicyEntry is
        created.  Segments of code can then be written to this table
        with the learned ScriptIndex values.

        The StorageType of this entry is determined by the value of
        the associated pmPolicyStorageType.

        The pmPolicyAdminGroup element of the index represents the
        administrative group of the policy of which this code entry is
        a part."
    INDEX { pmPolicyAdminGroup, pmPolicyCodeScriptIndex,
            pmPolicyCodeSegment }
    ::= { pmPolicyCodeTable 1 }

PmPolicyCodeEntry ::= SEQUENCE {
    pmPolicyCodeScriptIndex    Unsigned32,
    pmPolicyCodeSegment        Unsigned32,
    pmPolicyCodeText           PmUTF8String,
    pmPolicyCodeStatus         RowStatus

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}

pmPolicyCodeScriptIndex OBJECT-TYPE
    SYNTAX      Unsigned32 (1..4294967295)
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
         "A unique index for each policy condition or action.  The code
         for each such condition or action may be composed of multiple
         entries in this table if the code cannot fit in one entry.
         Values of pmPolicyCodeScriptIndex may not be used unless
         they have previously been assigned in the
         pmPolicyConditionScriptIndex or pmPolicyActionScriptIndex
         objects."
    ::= { pmPolicyCodeEntry 1 }

pmPolicyCodeSegment OBJECT-TYPE
    SYNTAX      Unsigned32 (1..4294967295)
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
         "A unique index for each segment of a policy condition or
         action.

         When a policy condition or action spans multiple entries in
         this table, the code of that policy starts from the
         lowest-numbered segment and continues with increasing segment
         values until it ends with the highest-numbered segment."
    ::= { pmPolicyCodeEntry 2 }

pmPolicyCodeText OBJECT-TYPE
    SYNTAX      PmUTF8String (SIZE (1..1024))
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
         "A segment of policy code (condition or action).  Lengthy
         Policy conditions or actions may be stored in multiple
         segments in this table that share the same value of
         pmPolicyCodeScriptIndex.  When multiple segments are used, it
         is recommended that each segment be as large as is practical.

         Entries in this table are associated with policies by values
         of the pmPolicyConditionScriptIndex and
         pmPolicyActionScriptIndex objects.  If the status of the
         related policy is active, then this object may not be
         modified."
    ::= { pmPolicyCodeEntry 3 }

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pmPolicyCodeStatus OBJECT-TYPE
    SYNTAX      RowStatus
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
         "The status of this code entry.

         Entries in this table are associated with policies by values
         of the pmPolicyConditionScriptIndex and
         pmPolicyActionScriptIndex objects.  If the status of the
         related policy is active, then this object can not be
         modified (i.e., deleted or set to notInService), nor may new
         entries be created.

         If the status of this object is active, no objects in this
         row may be modified."
    ::= { pmPolicyCodeEntry 4 }

-- Element Type Registration Table

pmElementTypeRegTable OBJECT-TYPE
    SYNTAX      SEQUENCE OF PmElementTypeRegEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A registration table for element types managed by this
        system.

        The Element Type Registration table allows the manager to
        learn what element types are being managed by the system and
        to register new types, if necessary.  An element type is
        registered by providing the OID of an SNMP object (i.e.,
        without the instance).  Each SNMP instance that exists under
        that object is a distinct element.  The index of the element is
        the index part of the discovered OID.  This index will be
        supplied to policy conditions and actions so that this code
        can inspect and configure the element.

        For example, this table might contain the following entries.
        The first three are agent-installed, and the 4th was
        downloaded by a management station:

  OIDPrefix        MaxLatency  Description               StorageType
  ifEntry          100 mS      interfaces - builtin      readOnly
  0.0              100 mS      system element - builtin  readOnly
  frCircuitEntry   100 mS      FR Circuits - builtin     readOnly
  hrSWRunEntry     60 sec      Running Processes         volatile

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        Note that agents may automatically configure elements in this
        table for frequently used element types (interfaces, circuits,
        etc.).  In particular, it may configure elements for whom
        discovery is optimized in one or both of the following ways:

        1. The agent may discover elements by scanning internal data
           structures as opposed to issuing local SNMP requests.  It is
           possible to recreate the exact semantics described in this
           table even if local SNMP requests are not issued.

        2. The agent may receive asynchronous notification of new
           elements (for example, 'card inserted') and use that
           information to instantly create elements rather than
           through polling.  A similar feature might be available for
           the deletion of elements.

        Note that the disposition of agent-installed entries is
        described by the pmPolicyStorageType object."
    ::= { pmMib 3 }

pmElementTypeRegEntry OBJECT-TYPE
    SYNTAX      PmElementTypeRegEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "A registration of an element type.

        Note that some values of this table's index may result in an
        instance name that exceeds a length of 128 sub-identifiers,
        which exceeds the maximum for the SNMP protocol.
        Implementations should take care to avoid such values."
    INDEX       { pmElementTypeRegOIDPrefix }
    ::= { pmElementTypeRegTable 1 }

PmElementTypeRegEntry ::= SEQUENCE {
    pmElementTypeRegOIDPrefix     OBJECT IDENTIFIER,
    pmElementTypeRegMaxLatency    Unsigned32,
    pmElementTypeRegDescription   PmUTF8String,
    pmElementTypeRegStorageType   StorageType,
    pmElementTypeRegRowStatus     RowStatus
}

pmElementTypeRegOIDPrefix OBJECT-TYPE
    SYNTAX      OBJECT IDENTIFIER
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "This OBJECT IDENTIFIER value identifies a table in which all

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        elements of this type will be found.  Every row in the
        referenced table will be treated as an element for the
        period of time that it remains in the table.  The agent will
        then execute policy conditions and actions as appropriate on
        each of these elements.

        This object identifier value is specified down to the 'entry'
        component (e.g., ifEntry) of the identifier.

        The index of each discovered row will be passed to each
        invocation of the policy condition and policy action.

        The actual mechanism by which instances are discovered is
        implementation dependent.  Periodic walks of the table to
        discover the rows in the table is one such mechanism.  This
        mechanism has the advantage that it can be performed by an
        agent with no knowledge of the names, syntax, or semantics
        of the MIB objects in the table.  This mechanism also serves as
        the reference design.  Other implementation-dependent
        mechanisms may be implemented that are more efficient (perhaps
        because they are hard coded) or that don't require polling.
        These mechanisms must discover the same elements as would the
        table-walking reference design.

        This object can contain a OBJECT IDENTIFIER, '0.0'.
        '0.0' represents the single instance of the system
        itself and provides an execution context for policies to
        operate on the 'system element' and on MIB objects
        modeled as scalars.  For example, '0.0' gives an execution
        context for policy-based selection of the operating system
        code version (likely modeled as a scalar MIB object).  The
        element type '0.0' always exists; as a consequence, no actual
        discovery will take place, and the pmElementTypeRegMaxLatency
        object will have no effect for the '0.0' element
        type.  However, if the '0.0' element type is not registered in
        the table, policies will not be executed on the '0.0' element.

        When a policy is invoked on behalf of a '0.0' entry in this
        table, the element name will be '0.0', and there is no index
        of 'this element' (in other words, it has zero length).

        As this object is used in the index for the
        pmElementTypeRegTable, users of this table should be careful
        not to create entries that would result in instance names with
        more than 128 sub-identifiers."
    ::= { pmElementTypeRegEntry 2 }

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pmElementTypeRegMaxLatency OBJECT-TYPE
    SYNTAX      Unsigned32
    UNITS       "milliseconds"
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "The PM agent is responsible for discovering new elements of
        types that are registered.  This object lets the manager
        control the maximum amount of time that may pass between the
        time an element is created and when it is discovered.

        In other words, in any given interval of this duration, all
        new elements must be discovered.  Note that how the policy
        agent schedules the checking of various elements within this
        interval is an implementation-dependent matter."
    ::= { pmElementTypeRegEntry 3 }

pmElementTypeRegDescription OBJECT-TYPE
    SYNTAX      PmUTF8String (SIZE (0..64))
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "A descriptive label for this registered type."
    ::= { pmElementTypeRegEntry 4 }

pmElementTypeRegStorageType OBJECT-TYPE
    SYNTAX      StorageType
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "This object defines whether this row is kept
         in volatile storage and lost upon reboot or
         backed up by non-volatile or permanent storage.

         If the value of this object is 'permanent', no values in the
         associated row have to be writable."
    ::= { pmElementTypeRegEntry 5 }

pmElementTypeRegRowStatus OBJECT-TYPE
    SYNTAX      RowStatus
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
        "The status of this registration entry.

        If the value of this object is active, no objects in this row
        may be modified."
    ::= { pmElementTypeRegEntry 6 }

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-- Role Table

pmRoleTable OBJECT-TYPE
    SYNTAX      SEQUENCE OF PmRoleEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
        "The pmRoleTable is a read-create table that organizes role
        strings sorted by element.  This table is used to create and
        modify role strings and their associations, as well as to allow
        a management station to learn about the existence of roles and
        their associations.

        It is the responsibility of the agent to keep track of any
        re-indexing of the underlying SNMP elements and to continue to
        associate role strings with the element with which they were
        initially configured.

        Policy MIB agents that have elements in multiple local SNMP
        contexts have to allow some roles to be assigned to elements
        in particular contexts.  This is particularly true when some
        elements have the same names in different contexts and the
        context is required to disambiguate them.  In those situations,
        a value for the pmRoleContextName may be provided.  When a
        pmRoleContextName value is not provided, the assignment is to
        the element in the default context.

        Policy MIB agents that discover elements on other systems and
        execute policies on their behalf need to have access to role
        information for these remote elements.  In such situations,
        role assignments for other systems can be stored in this table
        by providing values for the pmRoleContextEngineID parameters.

    For example:
    Example:
    element       role    context ctxEngineID   #comment
    ifindex.1     gold                          local, default context
    ifindex.2     gold                          local, default context
    repeaterid.1  foo     rptr1                 local, rptr1 context
    repeaterid.1  bar     rptr2                 local, rptr2 context
    ifindex.1     gold    ''      A             different system
    ifindex.1     gold    ''      B             different system

         The agent must store role string associations in non-volatile
         storage."
    ::= { pmMib 4 }


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