FOUNDRY-SN-ARP-GROUP-MIB

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Organization: Brocade Communications Systems, Inc.

Last Updated: 2010-06-02

Category: IP and Core Protocols, Vendor: Foundry/Brocade

Description: Brocade Foundry ARP group MIB providing ARP table management, static ARP entries, and proxy ARP configuration for FastIron routing devices.

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What Is FOUNDRY-SN-ARP-GROUP-MIB?

FOUNDRY-SN-ARP-GROUP-MIB is a Brocade (Foundry Networks) vendor-specific MIB providing ARP protocol management for FastIron routing devices, covering ARP table entries, static ARP configuration, and proxy ARP behavior alongside detailed ARP protocol statistics. It exposes counters for ARP requests/replies sent and received, invalid source/destination detections, and pending-request drops, giving visibility into Layer 3 address resolution health. Its monitoring value centers on software/protocol status and performance counters rather than physical hardware: snArpStatsTotalReceived, snArpStatsRequestSent, and snArpStatsRepliesSent track ARP traffic volume, while snArpStatsInvalidSource, snArpStatsInvalidDestination, and snArpStatsPendingDrop reveal malformed or dropped ARP traffic that could indicate spoofing attempts or a saturated ARP table. It is a self-contained Brocade enterprise MIB built on the standard SNMP SMI framework, with no evident dependency on other MIBs. It is deployed on Brocade/Foundry FastIron routers and Layer 3 switches for diagnosing address resolution issues and detecting anomalous ARP activity. Engineers can download the FOUNDRY-SN-ARP-GROUP-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in FOUNDRY-SN-ARP-GROUP-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 routers and Layer 3 switches

Monitoring Examples

Polling snArpStatsTotalReceived against snArpStatsRequestReceived and snArpStatsRepliesSent lets an operator gauge overall ARP traffic load on a FastIron router. A rising snArpStatsInvalidSource or snArpStatsInvalidDestination counter would flag malformed or spoofed ARP packets arriving on the device, a potential ARP-spoofing security concern. Meanwhile snArpStatsPendingDrop climbing over time indicates the device is dropping ARP requests it can't resolve in time, often a sign of an oversaturated ARP table or unreachable next-hop addresses.

What Can Be Monitored

ARP requests/replies sent and received
invalid source/destination ARP packets
pending ARP request drops
total ARP packets received

Imported Objects

From FOUNDRY-SN-ROOT-MIB

snSwitch

OBJECT-IDENTITY

From SNMPv2-SMI

Counter32
MODULE-IDENTITY
OBJECT-TYPE

How to Use in IPNetwork Monitor

Example using snArpStatsTotalReceived OID:

Select a Brocade (Foundry) FastIron switch 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 snArpStatsTotalReceived into the Find box to locate it in the OID tree, then select it and click OK. The total number of ARP packets received from interfaces, including those received in error. 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 Counter32-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases between polls, since a rising count of errors, failures, or discards often points to a real underlying problem. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
snArpInfo	1.3.6.1.4.1.1991.1.1.3.22			The Enterprise MIB for ARP support in SNMP. 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.
snArpStats	1.3.6.1.4.1.1991.1.1.3.22.1
C32 snArpStatsTotalReceivedEx	1.3.6.1.4.1.1991.1.1.3.22.1.1	Counter32	read-only	The total number of ARP packets received from interfaces, including those received in error.
C32 snArpStatsRequestReceived	1.3.6.1.4.1.1991.1.1.3.22.1.2	Counter32	read-only	The total number of input ARP Request packets received from interfaces.
C32 snArpStatsRequestSent	1.3.6.1.4.1.1991.1.1.3.22.1.3	Counter32	read-only	The total number of output ARP Request packets sent from interfaces.
C32 snArpStatsRepliesSent	1.3.6.1.4.1.1991.1.1.3.22.1.4	Counter32	read-only	The total number of output ARP Reply packets sent from interfaces.
C32 snArpStatsPendingDrop	1.3.6.1.4.1.1991.1.1.3.22.1.5	Counter32	read-only	The total number of ARP pending packets discarded.
C32 snArpStatsInvalidSource	1.3.6.1.4.1.1991.1.1.3.22.1.6	Counter32	read-only	The total number of ARP packets received with invalid sender protocol address.
C32 snArpStatsInvalidDestination	1.3.6.1.4.1.1991.1.1.3.22.1.7	Counter32	read-only	The total number of ARP packets received with invalid destination protocol address.

RFC description

Tracks ARP statistics including received, sent, and reply packet counters on Brocade Foundry switches.

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Download FOUNDRY-SN-ARP-GROUP-MIB