Network Working Group K. Gibbons
Request for Comments: 4939 2Wire, Inc.
Category: Standards Track G. Ramkumar
July 2007 Definitions of Managed Objects for iSNS
(Internet Storage Name Service)
Status of This Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright (C) The IETF Trust (2007).
The iSNS (Internet Storage Name Service) protocol provides storage
name service functionality on an IP network that is being used for
iSCSI (Internet Small Computer System Interface) or iFCP (Internet
Fibre Channel Protocol) storage. This document provides a mechanism
to monitor multiple iSNS Servers, including information about
registered objects in an iSNS Server.
1. The Internet-Standard Management Framework
For a detailed overview of the documents that describe the current
Internet-Standard Management Framework, please refer to section 7 of
RFC 3410 [RFC3410].
Managed objects are accessed via a virtual information store, termed
the Management Information Base or MIB. MIB objects are generally
accessed through the Simple Network Management Protocol (SNMP).
Objects in the MIB are defined using the mechanisms defined in the
Structure of Management Information (SMI). This memo specifies a MIB
module that is compliant to the SMIv2, which is described in STD 58,
RFC 2578 [RFC2578], STD 58, RFC 2579 [RFC2579] and STD 58, RFC 2580
The iSNS protocol, as described in RFC 4171 [RFC4171], can be used by
IP-based storage devices for dynamic registration and discovery of
other storage devices in the network. It has the capability to group
devices into storage Discovery Domains, and Discovery Domains into
Discovery Domain Sets. The iSNS MIB is designed to allow Simple
Network Management Protocol (SNMP) to be used to monitor iSNS servers
supporting iSCSI [RFC3720] and iFCP [RFC4172].
2.1. Requirement Levels
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
3.2. iSNS MIB Structure
The MIB is divided into sections for iSNS server information, iSNS
server registered objects information, and iSNS notifications.
| MANAGED iSNS |1 *| CONTROL NODE |
| SERVER |----| INFO |
| INFO | +--------------+
| | +--------------+
| | *| DDS AND DD |
| +------| INFO |
| | |
| *| REGISTERED |
+------------| ENTITIES |
| INFO |
| iSNS |
| NOTIFICATION |
| INFO |
The sections that are required to implement are for iSNS Server
management and notification.
3.3. iSNS Server Info
The isnsServerInfo section provides the ability to monitor multiple
iSNS Server instances. The isnsServerTable table provides
information on each server instance. This table is indexed by the
variable isnsServerIndex. The table indicates current settings for
each iSNS server being managed. The network address, TCP and UDP
ports being used by a server for iSNSP registrations and queries can
be determined from this table.
The count of objects registered in each iSNS server instance is shown
in the table isnsNumObjectsTable. The provides a summary of the
number Discovery Domain Sets, Discovery Domains, Entities, Portals,
Portal Groups, iSCSI Nodes, and iFCP FC Nodes and Ports.
3.3.1. Control Node Information
As defined in the iSNS specification, Control Nodes are objects that
have been registered with the server and are allowed to manage the
iSNS server. These Control Nodes are identified by their iSCSI Node
Name or iFCP FC Port Name. The isnsControlNodeInfo section of the
MIB provides the ability to view the currently registered set of
iSCSI and iFCP control nodes.
3.3.2. Discovery Domain Set (DDS)
The isnsDdsInfo section provides information on each registered DDS,
the Discovery Domain members of each DDS, for each iSNS Server
instance being managed. DDSs provide a method to group multiple
Discovery Domains for easier control. As described in the iSNS
Specification [RFC4171], a DDS can be enabled or disabled, which in
turn enables or disables the member Discovery Domains. Discovery
Domains that are contained in an enabled DDS are then enforced by an
3.3.3. Discovery Domain (DD)
The isnsDdInfo section provides information on each registered DD,
and the DD members, for each iSNS Server instance being managed. DDs
are collections of storage nodes and portals that are allowed to
discover one another. DD members can be iSCSI nodes, Entity Portals,
or iFCP nodes.
3.3.4. Registered Storage Objects
The isnsReg section provides information on the registered storage
objects for a specific iSNS Server instance. This section is divided
into subsections for Entities, Portals, and iSCSI Nodes, as well as
iFCP Port and Node information.
188.8.131.52. Registered Entities
The isnsRegEntityInfo section provides information on the registered
entities. Entities are collections of storage nodes and portals.
184.108.40.206. Registered Portals
The isnsRegPortalInfo section provides information on the registered
portals for a specific iSNS Server instance. Portals are logical
IP-Address, TCP/UDP Port pairs that provide access to storage nodes
contained in the associated Entity.
220.127.116.11. Registered Portal Groups
The isnsRegPortalGroupInfo section provides information on the
registered portal groups for a specific iSNS Server instance. As
described in iSCSI [RFC3720], Portal Groups provide a mapping between
Portals and iSCSI Storage Nodes contained in an Entity.
18.104.22.168. Registered iSCSI Nodes
The isnsRegIscsiNodeInfo section provides information on the
registered iSCSI Nodes for a specific iSNS Server instance. The
iSCSI nodes are individual storage targets or initiators.
22.214.171.124. Registered FC Ports
The isnsRegFcPortInfo section provides information on the registered
FC Ports for a specific iSNS Server instance. The FC Ports are ports
associated with an iFCP gateway.
126.96.36.199. Registered FC Nodes
The isnsRegFcNodeInfo section provides information on the registered
FC Nodes for a specific iSNS Server instance. The FC nodes are
individual storage devices associated with an iFCP gateway.
3.4. Multiple Server Instances
The management of multiple instances of iSNS servers by the agent is
supported. As described in Section 3.3, each managed iSNS server
instance has an entry in the table isnsServerTable.
3.5. iSNS Notifications
The isnsNotification section provides SNMP notifications for iSNS
Server state changes.
4. MIB References
The following MIB module has IMPORTS from [RFC2578], [RFC2579],
[RFC2580], [RFC3411], [RFC4001], [RFC4044], and [RFC4133]. In
REFERENCE clauses, it also refers to [RFC3720], [RFC4171], and