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RFC 7275

 
 
 

Inter-Chassis Communication Protocol for Layer 2 Virtual Private Network (L2VPN) Provider Edge (PE) Redundancy

Part 3 of 4, p. 35 to 64
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prevText      Top      Up      ToC       Page 35 
7.  Application TLVs

7.1.  Pseudowire Redundancy (PW-RED) Application TLVs

   This section discusses the "ICCP TLVs" for the Pseudowire Redundancy
   application.

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7.1.1.  PW-RED Connect TLV

   This TLV is included in the "RG Connect" message to signal the
   establishment of a PW-RED Application Connection.

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |U|F|     Type = 0x0010         |    Length                     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |      Protocol Version         |A|         Reserved            |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                      Optional Sub-TLVs                        |
     ~                                                               ~
     |                                                               |
     +                                 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |             ...                 |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   - U-bit and F-bit

     Both are set to 0.

   - Type

     Set to 0x0010 for "PW-RED Connect TLV".

   - Length

     Length of the TLV in octets, excluding the "U-bit", "F-bit",
     "Type", and "Length" fields.

   - Protocol Version

     The version of this particular protocol for the purposes of ICCP.
     This is set to 0x0001.

   - A-bit

     Acknowledgement bit.  Set to 1 if the sender has received a "PW-RED
     Connect TLV" from the recipient.  Otherwise, set to 0.

   - Reserved

     Reserved for future use.

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   - Optional Sub-TLVs

     There are no optional sub-TLVs defined for this version of the
     protocol.  This document does not impose any restrictions on the
     length of the sub-TLVs.

7.1.2.  PW-RED Disconnect TLV

   This TLV is used in an "RG Disconnect" message to indicate that the
   connection for the PW-RED application is to be terminated.

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |U|F|     Type = 0x0011         |    Length                     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                       Optional Sub-TLVs                       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   - U-bit and F-bit

     Both are set to 0.

   - Type

     Set to 0x0011 for "PW-RED Disconnect TLV".

   - Length

     Length of the TLV in octets, excluding the "U-bit", "F-bit",
     "Type", and "Length" fields.

   - Optional Sub-TLVs

     The only optional sub-TLV defined for this version of the protocol
     is the "PW-RED Disconnect Cause TLV" defined in Section 7.1.2.1.

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7.1.2.1.  PW-RED Disconnect Cause TLV

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |U|F|     Type = 0x0019         |    Length                     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                      Disconnect Cause String                  |
     ~                                                               ~
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   - U-bit and F-bit

     Both are set to 0.

   - Type

     Set to 0x0019 for "PW-RED Disconnect Cause TLV".

   - Length

     Length of the TLV in octets, excluding the "U-bit", "F-bit",
     "Type", and "Length" fields.

   - Disconnect Cause String

     Variable-length string specifying the reason for the disconnect,
     encoded in UTF-8 format.  The string does not include a terminating
     null character.  Used for network management.

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7.1.3.  PW-RED Config TLV

   The "PW-RED Config TLV" is used in the "RG Application Data" message
   and has the following format:

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |U|F|   Type = 0x0012           |    Length                     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                              ROID                             |
     +                                                               +
     |                                                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |      PW Priority              |            Flags              |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                  Service Name TLV                             |
     ~                                                               ~
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |            PW ID TLV or Generalized PW ID TLV                 |
     ~                                                               ~
     |                                                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   - U-bit and F-bit

     Both are set to 0.

   - Type

     Set to 0x0012 for "PW-RED Config TLV".

   - Length

     Length of the TLV in octets, excluding the "U-bit", "F-bit",
     "Type", and "Length" fields.

   - ROID

     As defined in Section 6.1.3.

   - PW Priority

     2 octets.  Pseudowire Priority.  Used to indicate which PW has
     better priority to go into active state.  Numerically lower numbers
     are better priority.  In case of a tie, the PE with the numerically
     lower identifier (i.e., IP Address) has better priority.

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   - Flags

     Valid values are as follows:

       i. Synchronized (0x01)

          Indicates that the sender has concluded transmitting all
          pseudowire configuration for a given service.

      ii. Purge Configuration (0x02)

          Indicates that the pseudowire is no longer configured for
          PW-RED operation.

     iii. Independent Mode (0x04)

          Indicates that the pseudowire is configured for redundancy
          using the Independent Mode of operation, per Section 5.1 of
          [RFC6870].

      iv. Independent Mode with Request Switchover (0x08)

          Indicates that the pseudowire is configured for redundancy
          using the Independent Mode of operation with the use of the
          "Request Switchover" bit, per Section 6.3 of [RFC6870].

       v. Master Mode (0x10)

          Indicates that the pseudowire is configured for redundancy
          using the Master/Slave Mode of operation, with the advertising
          PE acting as Master, per Section 5.2 of [RFC6870].

      vi. Slave Mode (0x20)

          Indicates that the pseudowire is configured for redundancy
          using the Master/Slave Mode of operation, with the advertising
          PE acting as Slave, per Section 5.2 of [RFC6870].

   - Sub-TLVs

     The "PW-RED Config TLV" includes the following two sub-TLVs:

       i. Service Name TLV

      ii. One of the following: PW ID TLV or Generalized PW ID TLV

     The format of the sub-TLVs is defined in Sections 7.1.3.1 through
     7.1.3.3.

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7.1.3.1.  Service Name TLV

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |U|F|    Type = 0x0013          |    Length                     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                        Service Name                           |
     ~                                                               ~
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   - U-bit and F-bit

     Both are set to 0.

   - Type

     Set to 0x0013 for "Service Name TLV".

   - Length

     Length of the TLV in octets, excluding the "U-bit", "F-bit",
     "Type", and "Length" fields.

   - Service Name

     The name of the L2VPN service instance, encoded in UTF-8 format and
     up to 80 octets in length.  The string does not include a
     terminating null character.

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7.1.3.2.  PW ID TLV

   This TLV is used to communicate the configuration of PWs for VPWS.

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |U|F|    Type = 0x0014          |    Length                     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                         Peer ID                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                         Group ID                              |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                         PW ID                                 |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   - U-bit and F-bit

     Both are set to 0.

   - Type

     Set to 0x0014 for "PW ID TLV".

   - Length

     Length of the TLV in octets, excluding the "U-bit", "F-bit",
     "Type", and "Length" fields.

   - Peer ID

     4-octet LDP Router ID of the peer at the far end of the PW.

   - Group ID

     Same as Group ID in [RFC4447], Section 5.2.

   - PW ID

     Same as PW ID in [RFC4447], Section 5.2.

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7.1.3.3.  Generalized PW ID TLV

   This TLV is used to communicate the configuration of PWs for VPLS.

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |U|F|   Type = 0x0015           |    Length                     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |   AGI Type    |    Length     |      Value                    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     ~                    AGI  Value (continued)                     ~
     |                                                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |   AII Type    |    Length     |      Value                    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     ~                   SAII  Value (continued)                     ~
     |                                                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |   AII Type    |    Length     |      Value                    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     ~                   TAII Value (continued)                      ~
     |                                                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   - U-bit and F-bit

     Both are set to 0.

   - Type

     Set to 0x0015 for "Generalized PW ID TLV".

   - Length

     Length of the TLV in octets, excluding the "U-bit", "F-bit",
     "Type", and "Length" fields.

   - AGI, AII, SAII, and TAII

     Defined in [RFC4447], Section 5.3.2.

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7.1.4.  PW-RED State TLV

   The "PW-RED State TLV" is used in the "RG Application Data" message.
   This TLV is used by a device to report its PW status to other members
   in the RG.

   The format of this TLV is as follows:

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |U|F|     Type = 0x0016         |    Length                     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                              ROID                             |
     +                                                               +
     |                                                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                      Local PW State                           |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                      Remote PW State                          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   - U-bit and F-bit

     Both are set to 0.

   - Type

     Set to 0x0016 for "PW-RED State TLV".

   - Length

     Length of the TLV in octets, excluding the "U-bit", "F-bit",
     "Type", and "Length" fields.

   - ROID

     As defined in Section 6.1.3.

   - Local PW State

     The status of the PW as determined by the sending PE, encoded in
     the same format as the "Status Code" field of the "PW Status TLV"
     defined in [RFC4447] and extended in [RFC6870].

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   - Remote PW State

     The status of the PW as determined by the remote peer of the
     sending PE.  Encoded in the same format as the "Status Code" field
     of the "PW Status TLV" defined in [RFC4447] and extended in
     [RFC6870].

7.1.5.  PW-RED Synchronization Request TLV

   The "PW-RED Synchronization Request TLV" is used in the "RG
   Application Data" message.  This TLV is used by a device to request
   that its peer retransmit configuration or operational state.  The
   following information can be requested:

   - configuration and/or state for one or more pseudowires

   - configuration and/or state for all pseudowires

   - configuration and/or state for all pseudowires in a given service

   The format of the TLV is as follows:

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |U|F|     Type = 0x0017         |    Length                     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |      Request Number           |C|S|    Request Type           |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                    Optional Sub-TLVs                          |
     ~                                                               ~
     |                                                               |
     +                                 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |             ...                 |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   - U-bit and F-bit

     Both are set to 0.

   - Type

     Set to 0x0017 for "PW-RED Synchronization Request TLV".

   - Length

     Length of the TLV in octets, excluding the "U-bit", "F-bit",
     "Type", and "Length" fields.

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   - Request Number

     2 octets.  Unsigned integer uniquely identifying the request.  Used
     to match the request with a response.  The value of 0 is reserved
     for unsolicited synchronization and MUST NOT be used in the "PW-RED
     Synchronization Request TLV".  Given the use of TCP, there are no
     issues associated with the wrap-around of the Request Number.

   - C-bit

     Set to 1 if the request is for configuration data.  Otherwise,
     set to 0.

   - S-bit

     Set to 1 if the request is for running state data.  Otherwise,
     set to 0.

   - Request Type

     14 bits specifying the request type, encoded as follows:

       0x00    Request Data for specified pseudowire(s)
       0x01    Request Data for all pseudowires in specified service(s)
       0x3FFF  Request All Data

   - Optional Sub-TLVs

     A set of zero or more TLVs, as follows:

     If the "Request Type" field is set to 0x00, then this field
     contains one or more "PW ID TLVs" or "Generalized PW ID TLVs".  If
     the "Request Type" field is set to 0x01, then this field contains
     one or more "Service Name TLVs".  If the "Request Type" field is
     set to 0x3FFF, then this field MUST be empty.  This document does
     not impose any restrictions on the length of the sub-TLVs.

7.1.6.  PW-RED Synchronization Data TLV

   The "PW-RED Synchronization Data TLV" is used in the "RG Application
   Data" message.  A pair of these TLVs is used by a device to delimit a
   set of TLVs that are sent in response to a "PW-RED Synchronization
   Request TLV".  The delimiting TLVs signal the start and end of the
   synchronization data and associate the response with its
   corresponding request via the "Request Number" field.

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   The "PW-RED Synchronization Data TLVs" are also used for unsolicited
   advertisements of complete PW-RED configuration and operational state
   data.  In this case, the "Request Number" field MUST be set to 0.

   This TLV has the following format:

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |U|F|    Type = 0x0018          |    Length                     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |     Request Number            |     Flags                     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   - U-bit and F-bit

     Both are set to 0.

   - Type

     Set to 0x0018 for "PW-RED Synchronization Data TLV".

   - Length

     Length of the TLV in octets, excluding the "U-bit", "F-bit",
     "Type", and "Length" fields.

   - Request Number

     2 octets.  Unsigned integer identifying the Request Number from the
     "PW-RED Synchronization Request TLV" that solicited this
     synchronization data response.

   - Flags

     2 octets.  Response flags encoded as follows:

       0x00  Synchronization Data Start
       0x01  Synchronization Data End

Top      Up      ToC       Page 48 
7.2.  Multi-Chassis LACP (mLACP) Application TLVs

   This section discusses the "ICCP TLVs" for Ethernet attachment
   circuit redundancy using the multi-chassis LACP (mLACP) application.

7.2.1.  mLACP Connect TLV

   This TLV is included in the "RG Connect" message to signal the
   establishment of an mLACP Application Connection.

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |U|F|     Type = 0x0030         |    Length                     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |      Protocol Version         |A|         Reserved            |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                    Optional Sub-TLVs                          |
     ~                                                               ~
     |                                                               |
     +                                 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |             ...                 |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   - U-bit and F-bit

     Both are set to 0.

   - Type

     Set to 0x0030 for "mLACP Connect TLV".

   - Length

     Length of the TLV in octets, excluding the "U-bit", "F-bit",
     "Type", and "Length" fields.

   - Protocol Version

     The version of this particular protocol for the purposes of ICCP.
     This is set to 0x0001.

   - A-bit

     Acknowledgement bit.  Set to 1 if the sender has received an "mLACP
     Connect TLV" from the recipient.  Otherwise, set to 0.

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   - Reserved

     Reserved for future use.

   - Optional Sub-TLVs

     There are no optional sub-TLVs defined for this version of the
     protocol.

7.2.2.  mLACP Disconnect TLV

   This TLV is used in an "RG Disconnect" message to indicate that the
   connection for the mLACP application is to be terminated.

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |U|F|     Type = 0x0031         |    Length                     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                       Optional Sub-TLVs                       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   - U-bit and F-bit

     Both are set to 0.

   - Type

     Set to 0x0031 for "mLACP Disconnect TLV".

   - Length

     Length of the TLV in octets, excluding the "U-bit", "F-bit",
     "Type", and "Length" fields.

   - Optional Sub-TLVs

     The only optional sub-TLV defined for this version of the protocol
     is the "mLACP Disconnect Cause TLV" defined in Section 7.2.2.1.

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7.2.2.1.  mLACP Disconnect Cause TLV

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |U|F|     Type = 0x003A         |    Length                     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                      Disconnect Cause String                  |
     ~                                                               ~
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   - U-bit and F-bit

     Both are set to 0.

   - Type

     Set to 0x003A for "mLACP Disconnect Cause TLV".

   - Length

     Length of the TLV in octets, excluding the "U-bit", "F-bit",
     "Type", and "Length" fields.

   - Disconnect Cause String

     Variable-length string specifying the reason for the disconnect.
     Used for network management.

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7.2.3.  mLACP System Config TLV

   The "mLACP System Config TLV" is sent in the "RG Application Data"
   message.  This TLV announces the local node's LACP system parameters
   to the RG peers.

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |U|F|     Type = 0x0032         |    Length                     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                         System ID                             |
     +                               +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                               |         System Priority       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |    Node ID    |
     +-+-+-+-+-+-+-+-+

   - U-bit and F-bit

     Both are set to 0.

   - Type

     Set to 0x0032 for "mLACP System Config TLV".

   - Length

     Length of the TLV in octets, excluding the "U-bit", "F-bit",
     "Type", and "Length" fields.

   - System ID

     6-octet field encoding the System ID used by LACP, as specified in
     [IEEE-802.1AX], Section 5.3.2.

   - System Priority

     2 octets encoding the LACP System Priority, as defined in
     [IEEE-802.1AX], Section 5.3.2.

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   - Node ID

     1 octet.  LACP Node ID.  Used to ensure that the LACP Port Numbers
     are unique across all devices in an RG.  Valid values are in the
     range 0-7.  Uniqueness of the LACP Port Numbers across RG members
     is ensured by encoding the Port Numbers as follows:

     - Most significant bit always set to 1

     - The next 3 most significant bits set to Node ID

     - Remaining 12 bits freely assigned by the system

7.2.4.  mLACP Aggregator Config TLV

   The "mLACP Aggregator Config TLV" is sent in the "RG Application
   Data" message.  This TLV is used to notify RG peers about the local
   configuration state of an Aggregator.

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |U|F|     Type = 0x0036         |    Length                     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                              ROID                             |
     +                                                               +
     |                                                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Aggregator ID           |    MAC Address                |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+                               +
     |                                                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Actor Key               |    Member Ports Priority      |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |     Flags     | Agg Name Len  |    Aggregator Name            |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+                               +
     ~                                                               ~
     |                                        ...                    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   - U-bit and F-bit

     Both are set to 0.

   - Type

     Set to 0x0036 for "mLACP Aggregator Config TLV".

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   - Length

     Length of the TLV in octets, excluding the "U-bit", "F-bit",
     "Type", and "Length" fields.

   - ROID

     Defined in Section 6.1.3 above.

   - Aggregator ID

     2 octets.  LACP Aggregator Identifier, as specified in
     [IEEE-802.1AX], Section 5.4.6.

   - MAC Address

     6 octets encoding the Aggregator Media Access Control (MAC)
     address.

   - Actor Key

     2 octets.  LACP Actor Key for the corresponding Aggregator, as
     specified in [IEEE-802.1AX], Section 5.3.5.

   - Member Ports Priority

     2 octets.  LACP administrative port priority associated with all
     interfaces bound to the Aggregator.  This field is valid only when
     the "Flags" field has "Priority Set" asserted.

   - Flags

     Valid values are as follows:

       i. Synchronized (0x01)

          Indicates that the sender has concluded transmitting all
          Aggregator configuration information.

      ii. Purge Configuration (0x02)

          Indicates that the Aggregator is no longer configured for
          mLACP operation.

     iii. Priority Set (0x04)

          Indicates that the "Member Ports Priority" field is valid.

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   - Agg Name Len

     1 octet.  Length of the "Aggregator Name" field in octets.

   - Aggregator Name

     Aggregator name, encoded in UTF-8 format, up to a maximum of
     20 octets.  Used for ease of management.  The string does not
     include a terminating null character.

7.2.5.  mLACP Port Config TLV

   The "mLACP Port Config TLV" is sent in the "RG Application Data"
   message.  This TLV is used to notify RG peers about the local
   configuration state of a port.

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |U|F|     Type = 0x0033         |    Length                     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Port Number             |    MAC Address                |
     +-------------------------------+                               +
     |                                                               |
     +---------------------------------------------------------------+
     |       Actor Key               |     Port Priority             |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                          Port Speed                           |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |     Flags     | Port Name Len |         Port Name             |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+                               +
     ~                                                               ~
     |                                        ...                    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   - U-bit and F-bit

     Both are set to 0.

   - Type

     Set to 0x0033 for "mLACP Port Config TLV".

   - Length

     Length of the TLV in octets, excluding the "U-bit", "F-bit",
     "Type", and "Length" fields.

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   - Port Number

     2 octets.  LACP Port Number for the corresponding interface, as
     specified in [IEEE-802.1AX], Section 5.3.4.  The Port Number MUST
     be encoded with the Node ID, as discussed above.

   - MAC Address

     6 octets encoding the port MAC address.

   - Actor Key

     2 octets.  LACP Actor Key for the corresponding interface, as
     specified in [IEEE-802.1AX], Section 5.3.5.

   - Port Priority

     2 octets.  LACP administrative port priority for the corresponding
     interface, as specified in [IEEE-802.1AX], Section 5.3.4.  This
     field is valid only when the "Flags" field has "Priority Set"
     asserted.

   - Port Speed

     4-octet integer encoding the port's current bandwidth in units of
     1,000,000 bits per second.  This field corresponds to the
     ifHighSpeed object of the IF-MIB [RFC2863].

   - Flags

     Valid values are as follows:

       i. Synchronized (0x01)

          Indicates that the sender has concluded transmitting all
          member link port configurations for a given Aggregator.

      ii. Purge Configuration (0x02)

          Indicates that the port is no longer configured for mLACP
          operation.

     iii. Priority Set (0x04)

          Indicates that the "Port Priority" field is valid.

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   - Port Name Len

     1 octet.  Length of the "Port Name" field in octets.

   - Port Name

     Corresponds to the ifName object of the IF-MIB [RFC2863].  Encoded
     in UTF-8 format and truncated to 20 octets.  Port Name does not
     include a terminating null character.

7.2.6.  mLACP Port Priority TLV

   The "mLACP Port Priority TLV" is sent in the "RG Application Data"
   message.  This TLV is used by a device to either advertise its
   operational Port Priority to other members in the RG or
   authoritatively request that a particular member of an RG change its
   port priority.

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |U|F|     Type = 0x0034         |    Length                     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          OpCode               |          Port Number          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |         Aggregator ID         |    Last Port Priority         |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |    Current Port Priority      |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   - U-bit and F-bit

     Both are set to 0.

   - Type

     Set to 0x0034 for "mLACP Port Priority TLV".

   - Length

     Length of the TLV in octets, excluding the "U-bit", "F-bit",
     "Type", and "Length" fields.

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   - OpCode

     2 octets identifying the operational code point for the TLV,
     encoded as follows:

       0x00  Local Priority Change Notification
       0x01  Remote Request for Priority Change

   - Port Number

     2-octet field representing the LACP Port Number, as specified in
     [IEEE-802.1AX], Section 5.3.4.  When the value of this field is 0,
     it denotes all ports bound to the Aggregator specified in the
     "Aggregator ID" field.  When non-zero, the Port Number MUST be
     encoded with the Node ID, as discussed above.

   - Aggregator ID

     2 octets.  LACP Aggregator Identifier, as specified in
     [IEEE-802.1AX], Section 5.4.6.

   - Last Port Priority

     2 octets.  LACP port priority for the corresponding interface, as
     specified in [IEEE-802.1AX], Section 5.3.4.  For local ports, this
     field encodes the previous operational value of port priority.  For
     remote ports, this field encodes the operational port priority last
     known to the PE via notifications received from its peers in the
     RG.

   - Current Port Priority

     2 octets.  LACP port priority for the corresponding interface, as
     specified in [IEEE-802.1AX], Section 5.3.4.  For local ports, this
     field encodes the new operational value of port priority being
     advertised by the PE.  For remote ports, this field specifies the
     new port priority being requested by the PE.

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7.2.7.  mLACP Port State TLV

   The "mLACP Port State TLV" is used in the "RG Application Data"
   message.  This TLV is used by a device to report its LACP port status
   to other members in the RG.

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |U|F|     Type = 0x0035         |    Length                     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                      Partner System ID                        |
     +                               +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                               |     Partner System Priority   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |     Partner Port Number       |     Partner Port Priority     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Partner Key             | Partner State |  Actor State  |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |      Actor Port Number        |           Actor Key           |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  Selected     |  Port State   |        Aggregator ID          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   - U-bit and F-bit

     Both are set to 0.

   - Type

     Set to 0x0035 for "mLACP Port State TLV".

   - Length

     Length of the TLV in octets, excluding the "U-bit", "F-bit",
     "Type", and "Length" fields.

   - Partner System ID

     6 octets.  The LACP Partner System ID for the corresponding
     interface, encoded as a MAC address as specified in [IEEE-802.1AX],
     Section 5.4.2.2, item r.

   - Partner System Priority

     2-octet field specifying the LACP Partner System Priority, as
     specified in [IEEE-802.1AX], Section 5.4.2.2, item q.

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   - Partner Port Number

     2 octets encoding the LACP Partner Port Number, as specified in
     [IEEE-802.1AX], Section 5.4.2.2, item u.  The Port Number MUST be
     encoded with the Node ID, as discussed above.

   - Partner Port Priority

     2-octet field encoding the LACP Partner Port Priority, as specified
     in [IEEE-802.1AX], Section 5.4.2.2, item t.

   - Partner Key

     2-octet field representing the LACP Partner Key, as defined in
     [IEEE-802.1AX], Section 5.4.2.2, item s.

   - Partner State

     1-octet field encoding the LACP Partner State Variable, as defined
     in [IEEE-802.1AX], Section 5.4.2.2, item v.

   - Actor State

     1 octet encoding the LACP Actor State Variable for the port, as
     specified in [IEEE-802.1AX], Section 5.4.2.2, item m.

   - Actor Port Number

     2-octet field representing the LACP Actor Port Number, as specified
     in [IEEE-802.1AX], Section 5.3.4.  The Port Number MUST be encoded
     with the Node ID, as discussed above.

   - Actor Key

     2-octet field encoding the LACP Actor Operational Key, as specified
     in [IEEE-802.1AX], Section 5.3.5.

   - Selected

     1 octet encoding the LACP "Selected" variable, defined in
     [IEEE-802.1AX], Section 5.4.8 as follows:

       0x00  SELECTED
       0x01  UNSELECTED
       0x02  STANDBY

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   - Port State

     1 octet encoding the operational state of the port as follows:

       0x00  Up
       0x01  Down
       0x02  Administratively Down
       0x03  Test (e.g., IEEE 802.3ah OAM Intrusive Loopback mode)

   - Aggregator ID

     2 octets.  LACP Aggregator Identifier to which this port is bound
     based on the outcome of the LACP selection logic.

7.2.8.  mLACP Aggregator State TLV

   The "mLACP Aggregator State TLV" is used in the "RG Application Data"
   message.  This TLV is used by a device to report its Aggregator
   status to other members in the RG.

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |U|F|     Type = 0x0037         |    Length                     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                      Partner System ID                        |
     +                               +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                               |     Partner System Priority   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |      Partner Key              |         Aggregator ID         |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |      Actor Key                |   Agg State   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   - U-bit and F-bit

     Both are set to 0.

   - Type

     Set to 0x0037 for "mLACP Aggregator State TLV".

   - Length

     Length of the TLV in octets, excluding the "U-bit", "F-bit",
     "Type", and "Length" fields.

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   - Partner System ID

     6 octets.  The LACP Partner System ID for the corresponding
     interface, encoded as a MAC address as specified in [IEEE-802.1AX],
     Section 5.4.2.2, item r.

   - Partner System Priority

     2-octet field specifying the LACP Partner System Priority, as
     specified in [IEEE-802.1AX], Section 5.4.2.2, item q.

   - Partner Key

     2-octet field representing the LACP Partner Key, as defined in
     [IEEE-802.1AX], Section 5.4.2.2, item s.

   - Aggregator ID

     2 octets.  LACP Aggregator Identifier, as specified in
     [IEEE-802.1AX], Section 5.4.6.

   - Actor Key

     2-octet field encoding the LACP Actor Operational Key, as specified
     in [IEEE-802.1AX], Section 5.3.5.

   - Agg State

     1 octet encoding the operational state of the Aggregator as
     follows:

       0x00  Up
       0x01  Down
       0x02  Administratively Down
       0x03  Test (e.g., IEEE 802.3ah OAM Intrusive Loopback mode)

7.2.9.  mLACP Synchronization Request TLV

   The "mLACP Synchronization Request TLV" is used in the "RG
   Application Data" message.  This TLV is used by a device to request
   that its peer retransmit configuration or operational state.  The
   following information can be requested:

   - system configuration and/or state

   - configuration and/or state for a specific port

   - configuration and/or state for all ports with a specific LACP Key

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   - configuration and/or state for all mLACP ports

   - configuration and/or state for a specific Aggregator

   - configuration and/or state for all Aggregators with a specific LACP
     Key

   - configuration and/or state for all mLACP Aggregators

   The format of the TLV is as follows:

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |U|F|     Type = 0x0038         |    Length                     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |      Request Number           |C|S|    Request Type           |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  Port Number / Aggregator ID  |             Actor Key         |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   - U-bit and F-bit

     Both are set to 0.

   - Type

     Set to 0x0038 for "mLACP Synchronization Request TLV".

   - Length

     Length of the TLV in octets, excluding the "U-bit", "F-bit",
     "Type", and "Length" fields.

   - Request Number

     2 octets.  Unsigned integer uniquely identifying the request.  Used
     to match the request with a response.  The value of 0 is reserved
     for unsolicited synchronization and MUST NOT be used in the "mLACP
     Synchronization Request TLV".

   - C-bit

     Set to 1 if the request is for configuration data.  Otherwise,
     set to 0.

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   - S-bit

     Set to 1 if the request is for running state data.  Otherwise,
     set to 0.

   - Request Type

     14 bits specifying the request type, encoded as follows:

       0x00    Request System Data
       0x01    Request Aggregator Data
       0x02    Request Port Data
       0x3FFF  Request All Data

   - Port Number / Aggregator ID

     2 octets.  When the "Request Type" field is set to "Request Port
     Data", this field encodes the LACP Port Number for the requested
     port.  When the "Request Type" field is set to "Request Aggregator
     Data", this field encodes the Aggregator ID of the requested
     Aggregator.  When the value of this field is 0, it denotes that
     information for all ports (or Aggregators) whose LACP Key is
     specified in the "Actor Key" field is being requested.

   - Actor Key

     2 octets.  LACP Actor Key for the corresponding port or Aggregator.
     When the value of this field is 0 (and the
     Port Number / Aggregator ID field is 0 as well), it denotes that
     information for all ports or Aggregators in the system is being
     requested.

7.2.10.  mLACP Synchronization Data TLV

   The "mLACP Synchronization Data TLV" is used in the "RG Application
   Data" message.  A pair of these TLVs is used by a device to delimit a
   set of TLVs that are being transmitted in response to an "mLACP
   Synchronization Request TLV".  The delimiting TLVs signal the start
   and end of the synchronization data and associate the response with
   its corresponding request via the "Request Number" field.

   The "mLACP Synchronization Data TLVs" are also used for unsolicited
   advertisements of complete mLACP configuration and operational state
   data.  The "Request Number" field MUST be set to 0 in this case.  For
   such unsolicited synchronization, the PE MUST advertise all system,
   Aggregator, and port information, as done during the initialization
   sequence.

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   This TLV has the following format:

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |U|F|     Type = 0x0039         |    Length                     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |     Request Number            |     Flags                     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   - U-bit and F-bit

     Both are set to 0.

   - Type

     Set to 0x0039 for "mLACP Synchronization Data TLV".

   - Length

     Length of the TLV in octets, excluding the "U-bit", "F-bit",
     "Type", and "Length" fields.

   - Request Number

     2 octets.  Unsigned integer identifying the Request Number from the
     "mLACP Synchronization Request TLV" that solicited this
     synchronization data response.

   - Flags

     2 octets.  Response flags, encoded as follows:

       0x00  Synchronization Data Start
       0x01  Synchronization Data End


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