FOUNDRY-SN-CAM-MIB

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Organization: Brocade Communications Systems, Inc.

Last Updated: 2010-06-02

Category: Vendor: Foundry/Brocade

Description: Brocade Foundry CAM (Content Addressable Memory) MIB providing MAC address table, route table, and hardware forwarding entry management.

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What Is FOUNDRY-SN-CAM-MIB?

FOUNDRY-SN-CAM-MIB is a Brocade (formerly Foundry Networks) vendor MIB describing the Content Addressable Memory (CAM) subsystem used for MAC address, route, and hardware forwarding table lookups on Foundry/Brocade switching and routing platforms. It exposes per-slot, per-processor CAM usage statistics, including table size, free entries, and utilization percentage for both Layer 2 and Layer 3 forwarding tables. This is squarely hardware-status monitoring: snCamUsageL3Slot and snCamUsageL3Processor identify which hardware component's CAM is being reported, while snCamUsageL3Size, snCamUsageL3Free, and snCamUsageL3UsedPercent reveal how close that hardware table is to exhaustion, a critical early-warning sign since a full CAM table causes packet flooding or dropped routes. It is a vendor-specific extension built on the standard Foundry/Brocade enterprise MIB tree rather than an IETF standard. It is deployed on Brocade/Foundry FastIron and BigIron switches and routers where administrators need to track hardware forwarding-table capacity as the network scales. Engineers can download the FOUNDRY-SN-CAM-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in FOUNDRY-SN-CAM-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

Brocade/Foundry FastIron and BigIron switches and routers

Monitoring Examples

An administrator polling snCamUsageL3Table entries would check snCamUsageL3UsedPercent per snCamUsageL3Slot/snCamUsageL3Processor to catch a Layer 3 CAM table approaching capacity before route installation failures occur. A parallel walk of snCamUsageL2Table reveals the same risk for the MAC address table, where a nearly-full L2 CAM can cause unknown-unicast flooding. Tracking snCamUsageL3Free over time on a given slot helps correlate CAM exhaustion with a recent large BGP or OSPF route injection.

What Can Be Monitored

Layer 3 CAM table usage/free entries
Layer 2 CAM (MAC table) usage
CAM utilization percentage per slot/processor
forwarding table capacity

Imported Objects

From FOUNDRY-SN-ROOT-MIB

platform

OBJECT-IDENTITY

From SNMPv2-SMI

Gauge32
MODULE-IDENTITY
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

TEXTUAL-CONVENTION

How to Use in IPNetwork Monitor

Example using snCamUsageL3Free OID:

Select a Brocade/Foundry FastIron/BigIron switch/router (CAM forwarding-table usage) as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type snCamUsageL3Free into the Find box to locate it in the OID tree, selecting the specific row/instance you want to monitor since this is a table column, then select it and click OK. The amount of CAM currently available for this layer 3 traffic entry. On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is a Gauge32-type OID, Value bounds is the most useful condition here — trigger an alert if the value drifts significantly from its normal baseline (in Entries), since an unexpected change often points to a real underlying issue. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
snCamMIB	1.3.6.1.4.1.1991.1.14.1			The MIB module to describe generic objects for the usage of Content Addressable Memory (CAM). Copyright 1996-2010 Brocade Communications Systems, Inc. All rights reserved. This Brocade Communications Systems SNMP Management Information Base Specification embodies Brocade Communications Systems' confidential and proprietary intellectual property. Brocade Communications Systems retains all title and ownership in the Specification, including any revisions. This Specification is supplied AS IS, and Brocade Communications Systems makes no warranty, either express or implied, as to the use, operation, condition, or performance of the specification, and any unintended consequence it may on the user environment.
snCamObjects	1.3.6.1.4.1.1991.1.14.1.1
INT snCamProfile	1.3.6.1.4.1.1991.1.14.1.1.1	INTEGER	read-only	This object identifies CAM partition profile. Each profile adjusts the partitions to optimize the device for corresponding applications.
snCamUsage	1.3.6.1.4.1.1991.1.14.1.1.2
snCamUsageL3Table	1.3.6.1.4.1.1991.1.14.1.1.2.1		not-accessible	A list of snCamUsageL3 entries. This table contains information of the entity's CAM usage for layer 3 traffic.
snCamUsageL3Entry	1.3.6.1.4.1.1991.1.14.1.1.2.1.1		not-accessible	An entry containing management information applicable to CAM usage for layer 3 traffic
U32 snCamUsageL3Slot	1.3.6.1.4.1.1991.1.14.1.1.2.1.1.1	Unsigned32	not-accessible	A number which uniquely identifies a linecard in the device
U32 snCamUsageL3Processor	1.3.6.1.4.1.1991.1.14.1.1.2.1.1.2	Unsigned32	not-accessible	A number which uniquely identifies the network processor within a linecard in the device
INT snCamUsageL3Type	1.3.6.1.4.1.1991.1.14.1.1.2.1.1.3	INTEGER	not-accessible	This object identifies the type of layer 3 traffic passing through the network processor.
U32 snCamUsageL3Supernet	1.3.6.1.4.1.1991.1.14.1.1.2.1.1.4	Unsigned32	not-accessible	This object identifies the Supernet for the layer 3 type traffic. It provides information for longest match lookup. For example, zero indicates all the bits of IP address will be matched, and one indicates all but the lowest bit in IP address will be matched. The range is [0..32] for IPv4 and IPv4VPN, where a value of 32 indicates the entry is the total of other supernets indexed by [0..31]. The range is [0..10] for IPv6, where a value of 10 indicates the entry is the total of other supernets indexed by [0..9].
U32 snCamUsageL3Size	1.3.6.1.4.1.1991.1.14.1.1.2.1.1.5	Unsigned32	read-only	The effective CAM size for this layer 3 traffic entry. For ipv4 traffic, each unit is 4 bytes. For ipv4vpn, each unit is 8 bytes. For ipv6, each unit is 16 bytes.
G32 snCamUsageL3FreeEx	1.3.6.1.4.1.1991.1.14.1.1.2.1.1.6	Gauge32	read-only	The amount of CAM currently available for this layer 3 traffic entry. For ipv4 traffic, each unit is 4 bytes. For ipv4vpn, each unit is 8 bytes. For ipv6, each unit is 16 bytes.
PER snCamUsageL3UsedPercent	1.3.6.1.4.1.1991.1.14.1.1.2.1.1.7	Percent	read-only	The percentage of CAM currently being used for this layer 3 traffic entry.
snCamUsageL2Table	1.3.6.1.4.1.1991.1.14.1.1.2.2		not-accessible	A list of snCamUsageL2 entries. This table contains information of the entity's CAM usage for layer 2 traffic.
snCamUsageL2Entry	1.3.6.1.4.1.1991.1.14.1.1.2.2.1		not-accessible	An entry containing management information applicable to CAM usage for layer 2 traffic
U32 snCamUsageL2Slot	1.3.6.1.4.1.1991.1.14.1.1.2.2.1.1	Unsigned32	not-accessible	A number which uniquely identifies a linecard in the device
U32 snCamUsageL2Processor	1.3.6.1.4.1.1991.1.14.1.1.2.2.1.2	Unsigned32	not-accessible	A number which uniquely identifies the network processor within a linecard in the device
INT snCamUsageL2Type	1.3.6.1.4.1.1991.1.14.1.1.2.2.1.3	INTEGER	not-accessible	This object identifies the type of layer 2 traffic passing through the network processor.
U32 snCamUsageL2Size	1.3.6.1.4.1.1991.1.14.1.1.2.2.1.4	Unsigned32	read-only	The effective CAM size for this layer 2 traffic entry. Each unit is 8 bytes.
G32 snCamUsageL2Free	1.3.6.1.4.1.1991.1.14.1.1.2.2.1.5	Gauge32	read-only	The amount of CAM currently available for this layer 2 traffic entry. Each unit is 8 bytes.
PER snCamUsageL2UsedPercent	1.3.6.1.4.1.1991.1.14.1.1.2.2.1.6	Percent	read-only	The percentage of CAM currently being used for this layer 2 traffic entry.
snCamUsageSessionTable	1.3.6.1.4.1.1991.1.14.1.1.2.3		not-accessible	A list of snCamUsageSession entries. This table contains information of the entitiy's CAM usage for sessions.
snCamUsageSessionEntry	1.3.6.1.4.1.1991.1.14.1.1.2.3.1		not-accessible	An entry containing management information applicable to CAM usage for sessions.
U32 snCamUsageSessionSlot	1.3.6.1.4.1.1991.1.14.1.1.2.3.1.1	Unsigned32	not-accessible	A number which uniquely identifies a linecard in the device
U32 snCamUsageSessionProcessor	1.3.6.1.4.1.1991.1.14.1.1.2.3.1.2	Unsigned32	not-accessible	A number which uniquely identifies the network processor within a linecard in the device
INT snCamUsageSessionType	1.3.6.1.4.1.1991.1.14.1.1.2.3.1.3	INTEGER	not-accessible	This object identifies the type of sessions.
U32 snCamUsageSessionSize	1.3.6.1.4.1.1991.1.14.1.1.2.3.1.4	Unsigned32	read-only	The effective CAM size for this session traffic entry. For IPv4 sessions, each unit is 16 bytes. For IPv4 sessions, each unit is 64 bytes.
G32 snCamUsageSessionFree	1.3.6.1.4.1.1991.1.14.1.1.2.3.1.5	Gauge32	read-only	The amount of CAM currently available this session traffic entry. For IPv4 sessions, each unit is 16 bytes. For IPv4 sessions, each unit is 64 bytes.
PER snCamUsageSessionUsedPercent	1.3.6.1.4.1.1991.1.14.1.1.2.3.1.6	Percent	read-only	The percentage of CAM currently being used by this session traffic entry
snCamUsageOtherTable	1.3.6.1.4.1.1991.1.14.1.1.2.4		not-accessible	A list of snCamUsageOther entries. This table contains information of the entitiy's CAM usage for types other than L3, L2, or Session.
snCamUsageOtherEntry	1.3.6.1.4.1.1991.1.14.1.1.2.4.1		not-accessible	An entry containing management information applicable to CAM usage for types other than L3, L2, or Session
U32 snCamUsageOtherSlot	1.3.6.1.4.1.1991.1.14.1.1.2.4.1.1	Unsigned32	not-accessible	A number which uniquely identifies a linecard in the device
U32 snCamUsageOtherProcessor	1.3.6.1.4.1.1991.1.14.1.1.2.4.1.2	Unsigned32	not-accessible	A number which uniquely identifies the network processor within a linecard in the device
INT snCamUsageOtherType	1.3.6.1.4.1.1991.1.14.1.1.2.4.1.3	INTEGER	not-accessible	This object identifies the type.
U32 snCamUsageOtherSize	1.3.6.1.4.1.1991.1.14.1.1.2.4.1.4	Unsigned32	read-only	The effective CAM size for this Other traffic entry. For GRE, each unit is 8 bytes. For multicast VPLS, each unit is 16 bytes.
G32 snCamUsageOtherFree	1.3.6.1.4.1.1991.1.14.1.1.2.4.1.5	Gauge32	read-only	The amount of CAM currently available this Other traffic entry. For GRE, each unit is 8 bytes. For multicast VPLS, each unit is 16 bytes.
PER snCamUsageOtherUsedPercent	1.3.6.1.4.1.1991.1.14.1.1.2.4.1.6	Percent	read-only	The percentage of CAM currently being used by this entry

RFC description

SNMP MIB module developed by Brocade Communications for describing generic objects related to Content Addressable Memory (CAM) operations. Used for monitoring CAM-related metrics and statistics on Foundry/Brocade network switches.

Start monitoring Brocade/Foundry FastIron/BigIron switch/router (CAM forwarding-table usage) with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

Download FOUNDRY-SN-CAM-MIB