Network Working Group C. DeSanti

Network Working Group C. DeSanti
Request for Comments: 4983 H.K. Vivek
Category: Standards Track K. McCloghrie
Cisco Systems
S. Gai
Nuova Systems
August 2007

Fibre Channel Registered State Change Notification (RSCN) MIB

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.

Abstract

This memo defines a portion of the Management Information Base (MIB)
for use with network management protocols in the Internet community.
In particular, it describes managed objects for information related
to the management of Fibre Channel's Registered State Change
Notifications (RSCNs).

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RFC 4983 Fibre Channel RSCN MIB August 2007

Table of Contents

1. Introduction ....................................................3
2. The Internet-Standard Management Framework ......................3
3. Short Overview of Fibre Channel .................................3
4. Relationship to Other MIBs ......................................5
5. MIB Overview ....................................................5
5.1. Fibre Channel Management Instance ..........................5
5.2. Switch Index ...............................................6
5.3. Fabric Index ...............................................6
5.4. The t11FcRscnRegistrationGroup Group .......................6
5.5. The t11FcRscnNotifyGroup Group .............................6
5.6. The t11FcRscnNotifyControlGroup Group ......................7
5.7. The t11FcRscnStatsGroup Group ..............................7
6. Definitions .....................................................8
6.1. The T11-FC-RSCN-MIB Module .................................8
7. IANA Considerations ............................................23
8. Security Considerations ........................................24
9. Acknowledgements ...............................................25
10. Normative References ..........................................25
11. Informative References ........................................26

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RFC 4983 Fibre Channel RSCN MIB August 2007

1. Introduction

This memo defines a portion of the Management Information Base (MIB)
for use with network management protocols in the Internet community.
In particular, it describes managed objects for information related
to Registered State Change Notifications (RSCNs) [FC-LS] in a Fibre
Channel network, including which Nx_Ports are registered to receive
which types of RSCNs, the control and generation of Simple Network
Management Protocol (SNMP) notifications on registration failures,
and RSCN-related statistics.

This memo was previously approved by INternational Committee for
Information Technology Standards (INCITS) Task Group T11.5
(http://www.t11.org); this document is a product of the IETF's IMSS
working group.

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 BCP 14, RFC 2119
[RFC2119].

2. 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
[RFC2580].

3. Short Overview of Fibre Channel

The Fibre Channel (FC) is logically a bidirectional point-to-point
serial data channel, structured for high performance. Fibre Channel
provides a general transport vehicle for higher level protocols such
as Small Computer System Interface (SCSI) command sets, the High-
Performance Parallel Interface (HIPPI) data framing, IP (Internet
Protocol), IEEE 802.2, and others.

Physically, Fibre Channel is an interconnection of multiple
communication points, called N_Ports, interconnected either by a
switching network, called a Fabric, or by a point-to-point link. A

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Fibre Channel "node" consists of one or more N_Ports. A Fabric may
consist of multiple Interconnect Elements, some of which are
switches. An N_Port connects to the Fabric via a port on a switch
called an F_Port. When multiple FC nodes are connected to a single
port on a switch via an "Arbitrated Loop" topology, the switch port
is called an FL_Port, and the nodes' ports are called NL_Ports. The
term Nx_Port is used to refer to either an N_Port or an NL_Port. The
term Fx_Port is used to refer to either an F_Port or an FL_Port. A
switch port, which is interconnected to another switch port via an
Inter-Switch Link (ISL), is called an E_Port. A B_Port connects a
bridge device with an E_Port on a switch; a B_Port provides a subset
of E_Port functionality.

Many Fibre Channel components, including the fabric, each node, and
most ports, have globally unique names. These globally unique names
are typically formatted as World Wide Names (WWNs). More information
on WWNs can be found in [FC-FS]. WWNs are expected to be persistent
across agent and unit resets.

Fibre Channel frames contain 24-bit address identifiers that identify
the frame's source and destination ports. Each FC port has both an
address identifier and a WWN. When a fabric is in use, the FC
address identifiers are dynamically assigned by a switch. Each octet
of a 24-bit address represents a level in an address hierarchy, with
a Domain_ID being the highest level of the hierarchy.

Registered State Change Notifications (RSCNs) are defined in [FC-LS]
as a means to provide Nx_Ports that have registered to receive such
notifications with a timely indication of changes in the state of
nodes attached to the fabric. Specifically, an Nx_Port may choose to
register, using a State Change Registration (SCR) request [FC-LS] to
receive RSCNs. When an event occurs that may affect a registered
Nx_Port's port's state, the registered Nx_Port will receive an RSCN.
For example, an Nx_Port can use RSCNs as the means by which it is
informed of the failures of other nodes, of new devices coming
online, or even of more network-accessible storage becoming
available. The payload of the RSCN indicates the type of change and
includes the address of the changed port. RSCNs are often generated
by the fabric, but an Nx_Port can also generate (and send to the
fabric) an RSCN if and when it detects an event not visible to the
fabric. The sender of an RSCN may coalesce several events into a
single RSCN message. Each RSCN is a "request" that is acknowledged
by the receiver with an accept or reject.

An RSCN is received by an Nx_Port from the Fabric as an Extended Link
Service (ELS) request [FC-LS]. The Fabric distributes RSCNs between
Switches using an SW_ILS frame with an Inter-Switch RSCN payload,
also known as an SW_RSCN [FC-SW-4]. So, when a Switch has directly

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attached Nx_Ports that have registered to receive RSCNs, it converts
received SW_RSCNs (i.e., SW_ILS frames containing SW_RSCN payloads)
into ELS requests containing the corresponding RSCN which it sends to
each such Nx_Port.

The latest standard for an interconnecting Fabric containing multiple
Fabric Switch elements is [FC-SW-4]. [FC-SW-4] carries forward the
earlier specification for the operation of a single Fabric in a
physical infrastructure, and augments it with the definition of
Virtual Fabrics and with the specification of how multiple Virtual
Fabrics can operate within one (or more) physical infrastructures.
The use of Virtual Fabrics provides for each frame to be tagged in
its header to indicate which one of several Virtual Fabrics that
frame is being transmitted on. All frames entering a particular
"Core Switch" [FC-SW-4] (i.e., a physical switch) on the same Virtual
Fabric are processed by the same "Virtual Switch" within that Core
Switch.

4. Relationship to Other MIBs

The first standardized MIB for Fibre Channel [RFC2837] was focused on
Fibre Channel switches. It was replaced by the more generic Fibre
Channel Management MIB [RFC4044] which defines basic information for
Fibre Channel hosts and switches, including extensions to the
standard [IF-MIB] for Fibre Channel interfaces. [RFC4044] includes
the specification of how the generic objects defined in [IF-MIB]
apply to Fibre Channel interfaces.

This MIB imports some common Textual Conventions defined in the
T11-TC-MIB [RFC4439] and in the T11-FC-NAME-SERVER-MIB [RFC4438].

5. MIB Overview

This section explains the use of a Fibre Channel management instance,
a Switch Index, and a Fabric Index. It also describes the four MIB
groups contained in the MIB.

5.1. Fibre Channel Management Instance

A Fibre Channel management instance is defined in [RFC4044] as a
separable managed instance of Fibre Channel functionality. Fibre
Channel functionality may be grouped into Fibre Channel management
instances in whatever way is most convenient for the
implementation(s). For example, one such grouping accommodates a
single SNMP agent having multiple AgentX [RFC2741] sub-agents, with
each sub-agent implementing a different Fibre Channel management
instance.

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The object, fcmInstanceIndex, is IMPORTed from the FC-MGMT-MIB
[RFC4044] as the index value to uniquely identify each Fibre Channel
management instance, for example, within the same SNMP context
([RFC3411], section 3.3.1).

5.2. Switch Index

The FC-MGMT-MIB [RFC4044] defines the fcmSwitchTable as a table of
information about Fibre Channel switches which are managed by Fibre
Channel management instances. Each Fibre Channel management instance
can manage one or more Fibre Channel switches. The Switch Index,
fcmSwitchIndex, is IMPORTed from the FC-MGMT-MIB as the index value
to uniquely identify a Fibre Channel switch amongst those (one or
more) managed by the same Fibre Channel management instance.

5.3. Fabric Index

Whether operating on a Physical Fabric (i.e., without Virtual
Fabrics) or within a Virtual Fabric, the manner of operation of RSCNs
within a/each Fabric is identical. Therefore, this MIB defines all
Fabric-related information in tables that are INDEXed by an arbitrary
integer, named a "Fabric Index", the syntax of which is IMPORTed from
the T11-TC-MIB [RFC4439]. When a device is connected to a single
Physical Fabric, without use of any Virtual Fabrics, the value of
this Fabric Index will always be 1. In an environment of multiple
Virtual and/or Physical Fabrics, this index provides a means to
distinguish one Fabric from another.

It is quite possible, and may even be likely, that a Fibre Channel
switch will have ports connected to multiple Virtual and/or Physical
Fabrics. Thus, in order to simplify a management protocol query
concerning all the Fabrics to which a single switch is connected,
fcmSwitchIndex will be listed before t11FcRscnFabricIndex when they
both appear in the same INDEX clause.

5.4. The t11FcRscnRegistrationGroup Group

This group contains information about the Nx_Ports which have
registered to receive RSCNs.

5.5. The t11FcRscnNotifyGroup Group

This group contains two notifications: one generated when a switch
rejects an SCR or RSCN; the other when a switch rejects an SW_RSCN.

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RFC 4983 Fibre Channel RSCN MIB August 2007

5.5.1. Flow-Control for Notifications

When defining SNMP notifications for events that occur in the data-
plane, the maximum frequency of their generation needs to be
considered. Unless there is some limiting factor, such notifications
need to be flow-controlled in some way, e.g., defined such that after
some maximum number within a specified time interval have occurred,
further notifications are suppressed for some subsequent time
interval. However, when such a suppression occurs, the Network
Management System (NMS) that didn't receive the notifications
(because they were suppressed) needs to be able to obtain an
indication of how many were suppressed. Therefore, an additional
Counter32 object needs to be defined, and/or a new type of
notification needs to be defined for use at the end of the interval.
While this is extra complexity, it is necessary for notifications
that need to be flow-controlled.

In contrast, for notifications such as both the ones defined in this
MIB module, which are generated due to control-plane events (and are
not able to start a chain reaction), the extra complexity of flow-
controlling these types of notifications is not warranted.

5.6. The t11FcRscnNotifyControlGroup Group

This group contains one object for each notification in the
t11FcRscnNotifyGroup group to enable/disable that notification, as
well as three objects that record information about the latest
rejection of an SCR, RSCN or SW_RSCN. Specifically, they record the
content (if available) of the rejected request, the source of the
rejected request, and the reason for the rejection.

5.7. The t11FcRscnStatsGroup Group

This group contains RSCN-related statistics. Two levels of
statistics are included:

1) counters at the message-type level, for:
- the number of SCRs received/rejected,
- the number of RSCNs sent/received/rejected,
- the number of SW_RSCNs sent/received/rejected.

2) counters for each different category of sent/received RSCNs,
where different categories are indicated by different values of
the 'Event Qualifier' contained in an RSCN message. Note that
if and when several RSCN events are coalesced into a single
RSCN message, then that message may be counted in more than one
of these counters. No counters are defined in this MIB for the
'Event Qualifier' value of '0001'b (meaning "Changed Name

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RFC 4983 Fibre Channel RSCN MIB August 2007

Server Object") because these types of RSCNs are counted by the
t11NsInRscns and t11NsOutRscns objects already defined in
[RFC4438].

6. Definitions

6.1. The T11-FC-RSCN-MIB Module

T11-FC-RSCN-MIB DEFINITIONS ::= BEGIN

-- The Fibre Channel RSCN MIB
--
-- for the monitoring of registrations by Nx_Ports to receive
-- Registered State Change Notifications (RSCNs), and the
-- monitoring of RSCN usage.
--

IMPORTS
MODULE-IDENTITY, OBJECT-TYPE,
NOTIFICATION-TYPE,
Counter32, mib-2 FROM SNMPv2-SMI -- [RFC2578]
MODULE-COMPLIANCE, OBJECT-GROUP,
NOTIFICATION-GROUP FROM SNMPv2-CONF -- [RFC2580]
TruthValue FROM SNMPv2-TC -- [RFC2579]
fcmInstanceIndex, fcmSwitchIndex,
FcNameIdOrZero, FcAddressIdOrZero FROM FC-MGMT-MIB -- [RFC4044]
T11NsGs4RejectReasonCode FROM T11-FC-NAME-SERVER-MIB -- [RFC4438]
T11FabricIndex FROM T11-TC-MIB; -- [RFC4439]

t11FcRscnMIB MODULE-IDENTITY
LAST-UPDATED "200701080000Z"
ORGANIZATION "For the initial versions, T11.
For later versions, the IETF's IMSS Working Group."
CONTACT-INFO
" Claudio DeSanti
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA 95134 USA
EMail: [email protected]

Keith McCloghrie
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA 95134 USA
EMail: [email protected]"

DESCRIPTION
"The MIB module for the management of registrations

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RFC 4983 Fibre Channel RSCN MIB August 2007

by Nx_Ports to receive RSCNs (Registered State Change
Notifications) on a Fibre Channel Fabric, as defined
in FC-LS, and for the monitoring of RSCNs sent/received
or rejected in a Fibre Channel Fabric.

Copyright (C) The Internet Society (2007). This version of
this MIB module is part of RFC 4983; see the RFC itself for
full legal notices."
REVISION "200701080000Z"
DESCRIPTION
"Initial version of this MIB module, published as RFC 4983."
::= { mib-2 161 }

t11FcRscnNotifications OBJECT IDENTIFIER ::= { t11FcRscnMIB 0 }
t11FcRscnObjects OBJECT IDENTIFIER ::= { t11FcRscnMIB 1 }
t11FcRscnConformance OBJECT IDENTIFIER ::= { t11FcRscnMIB 2 }
t11FcRscnRegistrations OBJECT IDENTIFIER ::= { t11FcRscnObjects 1 }
t11FcRscnStats OBJECT IDENTIFIER ::= { t11FcRscnObjects 2 }
t11FcRscnInformation OBJECT IDENTIFIER ::= { t11FcRscnObjects 3 }

-- State Change Registration Table

t11FcRscnRegTable OBJECT-TYPE
SYNTAX SEQUENCE OF T11FcRscnRegEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A table of Nx_Ports that have registered to receive
RSCNs on all Fabrics configured on one or more Fibre
Channel switches."
::= { t11FcRscnRegistrations 1 }

t11FcRscnRegEntry OBJECT-TYPE
SYNTAX T11FcRscnRegEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry containing information about one Nx_Port that
has registered with a particular switch (identified by
values of fcmInstanceIndex and fcmSwitchIndex) for a
particular Fabric (identified by a t11FcRscnFabricIndex
value)."
INDEX { fcmInstanceIndex, fcmSwitchIndex, t11FcRscnFabricIndex,
t11FcRscnRegFcId }
::= { t11FcRscnRegTable 1 }

T11FcRscnRegEntry ::= SEQUENCE {

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RFC 4983 Fibre Channel RSCN MIB August 2007

t11FcRscnFabricIndex T11FabricIndex,
t11FcRscnRegFcId FcAddressIdOrZero,
t11FcRscnRegType BITS
}

t11FcRscnFabricIndex OBJECT-TYPE
SYNTAX T11FabricIndex
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An index value that uniquely identifies a particular
Fabric.

In a Fabric conformant to FC-SW-4, multiple Virtual Fabrics
can operate within one (or more) physical infrastructures.
In such a case, this index value is used to uniquely
identify a particular Fabric within a physical
infrastructure.

In a Fabric that has (or can have) only a single Fabric
operating within the physical infrastructure, the
value of this Fabric Index will always be 1."
REFERENCE
"ANSI INCITS 418-2006, Fibre Channel - Switch Fabric - 4
(FC-SW-4), December 2006."
::= { t11FcRscnRegEntry 1 }

t11FcRscnRegFcId OBJECT-TYPE
SYNTAX FcAddressIdOrZero (SIZE (3))
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The Fibre Channel Address Identifier of the
registering Nx_Port."
::= { t11FcRscnRegEntry 2 }

t11FcRscnRegType OBJECT-TYPE
SYNTAX BITS {
fromFabricController(0),
fromNxPort(1)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object indicates the type of registration
desired by the registering Nx_Port, one bit per type:

'fromFabricController' -- RSCNs generated for events

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RFC 4983 Fibre Channel RSCN MIB August 2007

detected by the Fabric Controller.

'fromNxPorts' -- RSCNs generated for events
detected by the affected Nx_Port."
REFERENCE
"ANSI INCITS 433-2007, Fibre Channel - Link Services
(FC-LS), July 2007, Table 40."
::= { t11FcRscnRegEntry 3 }

-- Statistics

t11FcRscnStatsTable OBJECT-TYPE
SYNTAX SEQUENCE OF T11FcRscnStatsEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The RSCN-related statistics on all Fabrics configured
on one or more Fibre Channel switches.

Two levels of statistics are included:

1) counters at the message-type level, for:
- the number of SCRs received/rejected,
- the number of RSCNs sent/received/rejected,
- the number of SW_RSCNs sent/received/rejected.

2) counters of sent/received RSCNs per 'Event
Qualifier' value. Note that if and when several
RSCN events are coalesced into a single RSCN
message, then that message may be counted in
more than one of these counters."
::= { t11FcRscnStats 1 }

t11FcRscnStatsEntry OBJECT-TYPE
SYNTAX T11FcRscnStatsEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry containing statistics for a particular Fabric
(identified by a t11FcRscnFabricIndex value) on a particular
switch (identified by values of fcmInstanceIndex and
fcmSwitchIndex)."
INDEX { fcmInstanceIndex, fcmSwitchIndex, t11FcRscnFabricIndex }
::= { t11FcRscnStatsTable 1 }

T11FcRscnStatsEntry ::= SEQUENCE {
t11FcRscnInScrs Counter32,

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RFC 4983 Fibre Channel RSCN MIB August 2007

t11FcRscnInRscns Counter32,
t11FcRscnOutRscns Counter32,
t11FcRscnInSwRscns Counter32,
t11FcRscnOutSwRscns Counter32,
t11FcRscnScrRejects Counter32,
t11FcRscnRscnRejects Counter32,
t11FcRscnSwRscnRejects Counter32,
t11FcRscnInUnspecifiedRscns Counter32,
t11FcRscnOutUnspecifiedRscns Counter32,
t11FcRscnInChangedAttribRscns Counter32,
t11FcRscnOutChangedAttribRscns Counter32,
t11FcRscnInChangedServiceRscns Counter32,
t11FcRscnOutChangedServiceRscns Counter32,
t11FcRscnInChangedSwitchRscns Counter32,
t11FcRscnOutChangedSwitchRscns Counter32,
t11FcRscnInRemovedRscns Counter32,
t11FcRscnOutRemovedRscns Counter32
}

t11FcRscnInScrs OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of SCRs received from Nx_Ports
by this switch on this Fabric.

This counter has no discontinuities other than
those that all Counter32s have when sysUpTime=0."
::= { t11FcRscnStatsEntry 1 }

t11FcRscnInRscns OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of RSCNs received from Nx_Ports
by this switch on this Fabric.

This counter has no discontinuities other than
those that all Counter32s have when sysUpTime=0."
::= { t11FcRscnStatsEntry 2 }

t11FcRscnOutRscns OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current

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RFC 4983 Fibre Channel RSCN MIB August 2007

DESCRIPTION
"The number of RSCNs transmitted to Nx_Ports
by this switch on this Fabric.

This counter has no discontinuities other than
those that all Counter32s have when sysUpTime=0."
::= { t11FcRscnStatsEntry 3 }

t11FcRscnInSwRscns OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of SW_RSCNs received by this switch from
other switches on this Fabric.

This counter has no discontinuities other than
those that all Counter32s have when sysUpTime=0."
::= { t11FcRscnStatsEntry 4 }

t11FcRscnOutSwRscns OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of SW_RSCNs transmitted by this switch
from other switches on this Fabric.

This counter has no discontinuities other than
those that all Counter32s have when sysUpTime=0."
::= { t11FcRscnStatsEntry 5 }

t11FcRscnScrRejects OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of SCRs rejected by this switch on
this Fabric.

This counter has no discontinuities other than
those that all Counter32s have when sysUpTime=0."
::= { t11FcRscnStatsEntry 6 }

t11FcRscnRscnRejects OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only

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RFC 4983 Fibre Channel RSCN MIB August 2007

STATUS current
DESCRIPTION
"The number of RSCNs rejected by this switch on this
Fabric.

This counter has no discontinuities other than
those that all Counter32s have when sysUpTime=0."
::= { t11FcRscnStatsEntry 7 }

t11FcRscnSwRscnRejects OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of SW_RSCN rejected by this switch on this
Fabric.

This counter has no discontinuities other than
those that all Counter32s have when sysUpTime=0."
::= { t11FcRscnStatsEntry 8 }

t11FcRscnInUnspecifiedRscns OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Registered State Change Notifications
(RSCNs) received by this switch on this Fabric which
contained an RSCN Event Qualifier value of '0000'b
meaning 'Event is not specified'.

This counter has no discontinuities other than
those that all Counter32s have when sysUpTime=0."
REFERENCE
"ANSI INCITS 433-2007, Fibre Channel - Link Services
(FC-LS), July 2007, Table 36."
::= { t11FcRscnStatsEntry 9 }

t11FcRscnOutUnspecifiedRscns OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Registered State Change Notifications
(RSCNs) sent by this switch on this Fabric which
contained an RSCN Event Qualifier value of '0000'b
meaning 'Event is not specified'.

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RFC 4983 Fibre Channel RSCN MIB August 2007

This counter has no discontinuities other than
those that all Counter32s have when sysUpTime=0."
REFERENCE
"ANSI INCITS 433-2007, Fibre Channel - Link Services
(FC-LS), July 2007, Table 36."
::= { t11FcRscnStatsEntry 10 }

t11FcRscnInChangedAttribRscns OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Registered State Change Notifications
(RSCNs) received by this switch on this Fabric which
contained an RSCN Event Qualifier value of '0002'b
meaning 'Changed Port Attribute'.

This counter has no discontinuities other than
those that all Counter32s have when sysUpTime=0."
REFERENCE
"ANSI INCITS 433-2007, Fibre Channel - Link Services
(FC-LS), July 2007, Table 36."
::= { t11FcRscnStatsEntry 11 }

t11FcRscnOutChangedAttribRscns OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Registered State Change Notifications
(RSCNs) sent by this switch on this Fabric which
contained an RSCN Event Qualifier value of '0002'b
meaning 'Changed Port Attribute'.

This counter has no discontinuities other than
those that all Counter32s have when sysUpTime=0."
REFERENCE
"ANSI INCITS 433-2007, Fibre Channel - Link Services
(FC-LS), July 2007, Table 36."
::= { t11FcRscnStatsEntry 12 }

t11FcRscnInChangedServiceRscns OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Registered State Change Notifications
(RSCNs) received by this switch on this Fabric which

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RFC 4983 Fibre Channel RSCN MIB August 2007

contained an RSCN Event Qualifier value of '0003'b
meaning 'Changed Service Object'.

This counter has no discontinuities other than
those that all Counter32s have when sysUpTime=0."
REFERENCE
"ANSI INCITS 433-2007, Fibre Channel - Link Services
(FC-LS), July 2007, Table 36."
::= { t11FcRscnStatsEntry 13 }

t11FcRscnOutChangedServiceRscns OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Registered State Change Notifications
(RSCNs) sent by this switch on this Fabric which
contained an RSCN Event Qualifier value of '0003'b
meaning 'Changed Service Object'.

This counter has no discontinuities other than
those that all Counter32s have when sysUpTime=0."
REFERENCE
"ANSI INCITS 433-2007, Fibre Channel - Link Services
(FC-LS), July 2007, Table 36."
::= { t11FcRscnStatsEntry 14 }

t11FcRscnInChangedSwitchRscns OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Registered State Change Notifications
(RSCNs) received by this switch on this Fabric which
contained an RSCN Event Qualifier value of '0004'b
meaning 'Changed Switch Configuration'.

This counter has no discontinuities other than
those that all Counter32s have when sysUpTime=0."
REFERENCE
"ANSI INCITS 433-2007, Fibre Channel - Link Services
(FC-LS), July 2007, Table 36."
::= { t11FcRscnStatsEntry 15 }

t11FcRscnOutChangedSwitchRscns OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current

DeSanti, et al. Standards Track [Page 16]

RFC 4983 Fibre Channel RSCN MIB August 2007

DESCRIPTION
"The number of Registered State Change Notifications
(RSCNs) sent by this switch on this Fabric which
contained an RSCN Event Qualifier value of '0004'b
meaning 'Changed Switch Configuration'.

This counter has no discontinuities other than
those that all Counter32s have when sysUpTime=0."
REFERENCE
"ANSI INCITS 433-2007, Fibre Channel - Link Services
(FC-LS), July 2007, Table 36."
::= { t11FcRscnStatsEntry 16 }

t11FcRscnInRemovedRscns OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Registered State Change Notifications
(RSCNs) received by this switch on this Fabric which
contained an RSCN Event Qualifier value of '0005'b
meaning 'Removed Object'.

This counter has no discontinuities other than
those that all Counter32s have when sysUpTime=0."
REFERENCE
"ANSI INCITS 433-2007, Fibre Channel - Link Services
(FC-LS), July 2007, Table 36."
::= { t11FcRscnStatsEntry 17 }

t11FcRscnOutRemovedRscns OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Registered State Change Notifications
(RSCNs) sent by this switch on this Fabric which
contained an RSCN Event Qualifier value of '0005'b
meaning 'Removed Object'.

This counter has no discontinuities other than
those that all Counter32s have when sysUpTime=0."
REFERENCE
"ANSI INCITS 433-2007, Fibre Channel - Link Services
(FC-LS), July 2007, Table 36."
::= { t11FcRscnStatsEntry 18 }

DeSanti, et al. Standards Track [Page 17]

RFC 4983 Fibre Channel RSCN MIB August 2007

--
-- Notification Control Table
--
t11FcRscnNotifyControlTable OBJECT-TYPE
SYNTAX SEQUENCE OF T11FcRscnNotifyControlEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A table of control information for notifications
generated due to the rejection of an SCR or RSCN."
::= { t11FcRscnInformation 1 }

t11FcRscnNotifyControlEntry OBJECT-TYPE
SYNTAX T11FcRscnNotifyControlEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Each entry contains notification control information
concerning the rejection of RSCN/SCRs for a particular
Fabric (identified by the value of t11FcRscnFabricIndex)
by a particular switch (identified by values of
fcmInstanceIndex and fcmSwitchIndex)."
INDEX { fcmInstanceIndex, fcmSwitchIndex, t11FcRscnFabricIndex }
::= { t11FcRscnNotifyControlTable 1 }

T11FcRscnNotifyControlEntry ::= SEQUENCE {
t11FcRscnIlsRejectNotifyEnable TruthValue,
t11FcRscnElsRejectNotifyEnable TruthValue,
t11FcRscnRejectedRequestString OCTET STRING,
t11FcRscnRejectedRequestSource FcNameIdOrZero,
t11FcRscnRejectReasonCode T11NsGs4RejectReasonCode,
t11FcRscnRejectReasonCodeExp OCTET STRING,
t11FcRscnRejectReasonVendorCode OCTET STRING
}

t11FcRscnIlsRejectNotifyEnable OBJECT-TYPE
SYNTAX TruthValue
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This object specifies if a t11FcRscnIlsRejectReqNotify
notification should be generated when this switch
rejects an SW_RSCN on this Fabric.

Values written to this object should be retained
over agent reboots."
DEFVAL { false }
::= { t11FcRscnNotifyControlEntry 1 }

DeSanti, et al. Standards Track [Page 18]

RFC 4983 Fibre Channel RSCN MIB August 2007

t11FcRscnElsRejectNotifyEnable OBJECT-TYPE
SYNTAX TruthValue
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This object specifies if a t11FcRscnElsRejectReqNotify
notification should be generated when this switch
rejects an RSCN or SCR on this Fabric.

Values written to this object should be retained
over agent reboots."
DEFVAL { false }
::= { t11FcRscnNotifyControlEntry 2 }

t11FcRscnRejectedRequestString OBJECT-TYPE
SYNTAX OCTET STRING (SIZE (0..255))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The binary content of the RSCN, SCR, or SW_RSCN that
was most recently rejected by this switch on this Fabric.
The value is formatted as an octet string (in network
byte order) as described in the relevant Fibre Channel
standard, containing the payload (which is typically a
list of affected ports and error codes) of the rejected
RSCN or SCR as described in FC-LS, or the rejected
SW_RSCN as described in FC-SW-4.

This object contains the zero-length string if and when
the RSCN/SCR/SW_RSCN payload is unavailable. When the
length of this object is 255 octets, it contains the
first 255 octets of the payload (in network byte order)."
REFERENCE
"ANSI INCITS 433-2007, Fibre Channel - Link Services
(FC-LS), July 2007, Tables 34 & 39.

ANSI INCITS 418-2006, Fibre Channel - Switch Fabric - 4
(FC-SW-4), December 2006, Table 45."
::= { t11FcRscnNotifyControlEntry 3 }

t11FcRscnRejectedRequestSource OBJECT-TYPE
SYNTAX FcNameIdOrZero
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The WWN that was the source of the RSCN, SCR, or
SW_RSCN that was most recently rejected by this switch
on this Fabric."

DeSanti, et al. Standards Track [Page 19]

RFC 4983 Fibre Channel RSCN MIB August 2007

::= { t11FcRscnNotifyControlEntry 4 }

t11FcRscnRejectReasonCode OBJECT-TYPE
SYNTAX T11NsGs4RejectReasonCode
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object contains the Reason Code of the most recent
rejection by this switch of an RSCN, SCR or SW_RSCN on
this Fabric."
REFERENCE
"ANSI INCITS 433-2007, Fibre Channel - Link Services
(FC-LS), July 2007, Table 146.

ANSI INCITS 418-2006, Fibre Channel - Switch Fabric - 4
(FC-SW-4), December 2006, Table 5."
::= { t11FcRscnNotifyControlEntry 5 }

t11FcRscnRejectReasonCodeExp OBJECT-TYPE
SYNTAX OCTET STRING (SIZE(1))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object contains the Reason Code Explanation
of the most recent rejection by this switch of an
RSCN, SCR or SW_RSCN on this Fabric."
REFERENCE
"ANSI INCITS 433-2007, Fibre Channel - Link Services
(FC-LS), July 2007, Table 147.

ANSI INCITS 418-2006, Fibre Channel - Switch Fabric - 4
(FC-SW-4), December 2006, Table 6."
::= { t11FcRscnNotifyControlEntry 6 }

t11FcRscnRejectReasonVendorCode OBJECT-TYPE
SYNTAX OCTET STRING (SIZE(1))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object contains the Reason Vendor Specific
Code of the most recent rejection by this switch
of an RSCN, SCR or SW_RSCN on this Fabric."
REFERENCE
"ANSI INCITS 433-2007, Fibre Channel - Link Services
(FC-LS), July 2007, Table 148.

ANSI INCITS 418-2006, Fibre Channel - Switch Fabric - 4
(FC-SW-4), December 2006, Section 6.1.3."

DeSanti, et al. Standards Track [Page 20]

RFC 4983 Fibre Channel RSCN MIB August 2007

::= { t11FcRscnNotifyControlEntry 7 }

-- Notifications

t11FcRscnElsRejectReqNotify NOTIFICATION-TYPE
OBJECTS { t11FcRscnRejectedRequestString,
t11FcRscnRejectedRequestSource,
t11FcRscnRejectReasonCode,
t11FcRscnRejectReasonCodeExp,
t11FcRscnRejectReasonVendorCode }
STATUS current
DESCRIPTION
"This notification is generated when a switch rejects
an SCR or RSCN.

The value of t11FcRscnRejectedRequestString indicates the
binary content of the rejected request if available, or
the zero-length string otherwise. The source of the
rejected request is given by t11FcRscnRejectedRequestSource,
and the reason for rejection is given by the values of
t11FcRscnRejectReasonCode, t11FcRscnRejectReasonCodeExp
and t11FcRscnRejectReasonVendorCode."
::= { t11FcRscnNotifications 1 }

t11FcRscnIlsRejectReqNotify NOTIFICATION-TYPE
OBJECTS { t11FcRscnRejectedRequestString,
t11FcRscnRejectedRequestSource,
t11FcRscnRejectReasonCode,
t11FcRscnRejectReasonCodeExp,
t11FcRscnRejectReasonVendorCode }
STATUS current
DESCRIPTION
"This notification is generated when a switch rejects
an SW_RSCN.

The value of t11FcRscnRejectedRequestString indicates the
binary content of the rejected request if available, or
the zero-length string otherwise. The source of the
rejected request is given by t11FcRscnRejectedRequestSource,
and the reason for rejection is given by the values of
t11FcRscnRejectReasonCode, t11FcRscnRejectReasonCodeExp
and t11FcRscnRejectReasonVendorCode."
::= { t11FcRscnNotifications 2 }

-- Conformance
t11FcRscnCompliances OBJECT IDENTIFIER ::= { t11FcRscnConformance 1 }
t11FcRscnGroups OBJECT IDENTIFIER ::= { t11FcRscnConformance 2 }

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RFC 4983 Fibre Channel RSCN MIB August 2007

t11FcRscnCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for entities that implement
this MIB."
MODULE
MANDATORY-GROUPS { t11FcRscnRegistrationGroup,
t11FcRscnNotifyControlGroup,
t11FcRscnNotifyGroup }

GROUP t11FcRscnStatsGroup
DESCRIPTION
"These counters, containing RSCN-related statistics, are
mandatory only for those systems that count such events."

OBJECT t11FcRscnIlsRejectNotifyEnable
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."

OBJECT t11FcRscnElsRejectNotifyEnable
MIN-ACCESS read-only
DESCRIPTION
"Write access is not required."

::= { t11FcRscnCompliances 1 }

-- Units of conformance

t11FcRscnRegistrationGroup OBJECT-GROUP
OBJECTS { t11FcRscnRegType }
STATUS current
DESCRIPTION
"A collection of objects for monitoring RSCN
registrations."
::= { t11FcRscnGroups 1 }

t11FcRscnStatsGroup OBJECT-GROUP
OBJECTS { t11FcRscnInScrs,
t11FcRscnInRscns,
t11FcRscnOutRscns,
t11FcRscnInSwRscns,
t11FcRscnOutSwRscns,
t11FcRscnScrRejects,
t11FcRscnRscnRejects,
t11FcRscnSwRscnRejects,
t11FcRscnInUnspecifiedRscns,

DeSanti, et al. Standards Track [Page 22]

RFC 4983 Fibre Channel RSCN MIB August 2007

t11FcRscnOutUnspecifiedRscns,
t11FcRscnInChangedAttribRscns,
t11FcRscnOutChangedAttribRscns,
t11FcRscnInChangedServiceRscns,
t11FcRscnOutChangedServiceRscns,
t11FcRscnInChangedSwitchRscns,
t11FcRscnOutChangedSwitchRscns,
t11FcRscnInRemovedRscns,
t11FcRscnOutRemovedRscns
}
STATUS current
DESCRIPTION
"A collection of objects for collecting RSCN-related
statistics."
::= { t11FcRscnGroups 2 }

t11FcRscnNotifyControlGroup OBJECT-GROUP
OBJECTS { t11FcRscnIlsRejectNotifyEnable,
t11FcRscnElsRejectNotifyEnable,
t11FcRscnRejectedRequestString,
t11FcRscnRejectedRequestSource,
t11FcRscnRejectReasonCode,
t11FcRscnRejectReasonCodeExp,
t11FcRscnRejectReasonVendorCode
}
STATUS current
DESCRIPTION
"A collection of notification control and
notification information objects."
::= { t11FcRscnGroups 3 }

t11FcRscnNotifyGroup NOTIFICATION-GROUP
NOTIFICATIONS { t11FcRscnIlsRejectReqNotify,
t11FcRscnElsRejectReqNotify
}
STATUS current
DESCRIPTION
"A collection of notifications for monitoring
ILS and ELS rejections by the RSCN module."
::= { t11FcRscnGroups 4 }

END

7. IANA Considerations

IANA has assigned a MIB OID for the T11-FC-RSCN-MIB module under the
appropriate subtree.

DeSanti, et al. Standards Track [Page 23]

RFC 4983 Fibre Channel RSCN MIB August 2007

8. Security Considerations

There are a number of management objects defined in this MIB module
with a MAX-ACCESS clause of read-write and/or read-create. Such
objects may be considered sensitive or vulnerable in some network
environments. The support for SET operations in a non-secure
environment without proper protection can have a negative effect on
network operations. These objects and their
sensitivity/vulnerability are:

t11FcRscnIlsRejectNotifyEnable
t11FcRscnElsRejectNotifyEnable
-- ability to enable/disable a notification; these object, if
misconfigured, would either generate unwanted notifications
or suppress wanted notifications.

Some of the readable objects in this MIB module (i.e., objects with a
MAX-ACCESS other than not-accessible) may also be considered
sensitive or vulnerable in some network environments. It is thus
important to control even GET and/or NOTIFY access to these objects
and possibly to even encrypt the values of these objects when sending
them over the network via SNMP. These are the tables and objects and
their sensitivity/vulnerability:

t11FcRscnRegTable -- contains a list of Nx_Ports that are
currently registered to received RSCNs.

t11FcRscnStatsTable -- contains RSCN-related statistics.

t11FcRscnNotifyControlTable -- contains control and logging
information for notifications that are concerned with the
rejection of RSCN-related requests.

SNMP versions prior to SNMPv3 did not include adequate security.
Even if the network itself is secure (for example by using IPsec),
even then, there is no control as to who on the secure network is
allowed to access and GET/SET (read/change/create/delete) the objects
in this MIB module.

It is RECOMMENDED that implementors consider the security features as
provided by the SNMPv3 framework (see [RFC3410], section 8),
including full support for the SNMPv3 cryptographic mechanisms (for
authentication and privacy).

Further, deployment of SNMP versions prior to SNMPv3 is NOT
RECOMMENDED. Instead, it is RECOMMENDED to deploy SNMPv3 and to
enable cryptographic security. It is then a customer/operator

DeSanti, et al. Standards Track [Page 24]

RFC 4983 Fibre Channel RSCN MIB August 2007

responsibility to ensure that the SNMP entity giving access to an
instance of this MIB module is properly configured to give access to
the objects only to those principals (users) that have legitimate
rights to indeed GET or SET (change/create/delete) them.

9. Acknowledgements

This document was originally developed and approved by the INCITS
Task Group T11.5 (http://www.t11.org) as the SM-RSCNM project. We
wish to acknowledge the many contributions and comments from the
INCITS Technical Committee T11, especially from the following:

T11 Chair: Robert Snively, Brocade
T11 Vice Chair: Claudio DeSanti, Cisco Systems
T11.5 Chair: Roger Cummings, Symantec
T11.5 Vice Chair: Scott Kipp, McData
and T11.5 members.

The document was subsequently a work item of the IETF's IMSS Working
Group, chaired by David Black (EMC Corporation). We thank Bert
Wijnen (Lucent Technologies) for his thorough review of the document.
We also wish to acknowledge Dan Romascanu (Avaya), the IETF Area
Director, for his comments and assistance.

10. Normative References

[RFC2578] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J.,
Rose, M. and S. Waldbusser, "Structure of Management
Information Version 2 (SMIv2)", STD 58, RFC 2578, April
1999.

[RFC2579] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J.,
Rose, M. and S. Waldbusser, "Textual Conventions for
SMIv2", STD 58, RFC 2579, April 1999.

[RFC2580] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J.,
Rose, M. and S. Waldbusser, "Conformance Statements for
SMIv2", STD 58, RFC 2580, April 1999.

[RFC3411] Harrington, D., Presuhn, R., and B. Wijnen, "An
Architecture for Describing Simple Network Management
Protocol (SNMP) Management Frameworks", STD 58, RFC 3411,
December 2002.

[IF-MIB] McCloghrie, K. and F. Kastenholz, "The Interfaces Group
MIB", RFC 2863, June 2000.

DeSanti, et al. Standards Track [Page 25]

RFC 4983 Fibre Channel RSCN MIB August 2007

[RFC4044] McCloghrie, K., "Fibre Channel Management MIB", RFC 4044,
May 2005.

[RFC4438] DeSanti, C., Gaonkar, V., Vivek, H.K., McCloghrie, K., and
S. Gai, "Fibre Channel Name Server MIB", RFC 4438, March
2006.

[RFC4439] DeSanti, C., Gaonkar, V., McCloghrie, K., and S. Gai,
"Fibre Channel Fabric Address Manager MIB", RFC 4439,
March 2006.

[FC-SW-4] "Fibre Channel - Switch Fabric - 4 (FC-SW-4)", ANSI INCITS
418-2006, http://www.t11.org/t11/stat.nsf/upnum/1674-d,
December 2006.

[FC-FS] "Fibre Channel - Framing and Signaling (FC-FS)", ANSI
INCITS 373-2003,
http://www.t11.org/t11/stat.nsf/upnum/1331-d, April 2003.

[FC-LS] "Fibre Channel - Link Services (FC-LS)", ANSI INCITS
433-2007, http://www.t11.org/t11/stat.nsf/upnum/1620-d,
July 2007.

[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.

11. Informative References

[RFC2741] Daniele, M., Wijnen, B., Ellison, M., and D. Francisco,
"Agent Extensibility (AgentX) Protocol Version 1", RFC
2741, January 2000.

[RFC2837] Teow, K., "Definitions of Managed Objects for the Fabric
Element in Fibre Channel Standard", RFC 2837, May 2000.

[RFC3410] Case, J., Mundy, R., Partain, D., and B. Stewart,
"Introduction and Applicability Statements for Internet-
Standard Management Framework", RFC 3410, December 2002.

DeSanti, et al. Standards Track [Page 26]

RFC 4983 Fibre Channel RSCN MIB August 2007

Authors' Addresses

Claudio DeSanti
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA 95134 USA
Phone: +1 408 853-9172
EMail: [email protected]

H.K. Vivek
Cisco Systems, Inc.
71 Millers Rd
Bangalore, India
Phone: +91 80 2289933x5117
EMail: [email protected]

Keith McCloghrie
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA 95134 USA
Phone: +1 408 526-5260
EMail: [email protected]

Silvano Gai
Nuova Systems
3 West Plumeria Drive
San Jose, CA 95134
Phone: +1 408 387-6123
EMail: [email protected]

DeSanti, et al. Standards Track [Page 27]

RFC 4983 Fibre Channel RSCN MIB August 2007

Full Copyright Statement

Copyright (C) The IETF Trust (2007).

This document is subject to the rights, licenses and restrictions
contained in BCP 78, and except as set forth therein, the authors
retain all their rights.

This document and the information contained herein are provided on an
"AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY, THE IETF TRUST AND
THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF
THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

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The IETF takes no position regarding the validity or scope of any
Intellectual Property Rights or other rights that might be claimed to
pertain to the implementation or use of the technology described in
this document or the extent to which any license under such rights
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made any independent effort to identify any such rights. Information
on the procedures with respect to rights in RFC documents can be
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Copies of IPR disclosures made to the IETF Secretariat and any
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specification can be obtained from the IETF on-line IPR repository at
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The IETF invites any interested party to bring to its attention any
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this standard. Please address the information to the IETF at
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DeSanti, et al. Standards Track [Page 28]