FOUNDRY-CAR-MIB

All MIBs › FOUNDRY-CAR-MIB

Organization: Brocade Communications Systems, Inc.

Last Updated: 2010-06-02

Category: Quality of Service, Vendor: Foundry/Brocade

Description: Brocade Foundry Committed Access Rate (CAR) MIB providing per-interface traffic policing configuration and statistics for rate limiting on FastIron devices.

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What Is FOUNDRY-CAR-MIB?

FOUNDRY-CAR-MIB is a Brocade Communications Systems MIB (snCAR, formerly Foundry Networks, under the snSwitch enterprise branch) implementing Committed Access Rate traffic policing on FastIron-family switches. Its core table, snPortCARTable, is indexed by interface, traffic direction (input/output via the PacketSource convention), and a per-rule row index, and configures the rate-limit's matching criteria (RateLimitType: all traffic, or traffic matching a standard or 'quick' access list via snPortCARAccIdx), the committed rate and normal/extended burst limits (snPortCARRate, snPortCARLimit, snPortCARExtLimit), and the conform/exceed actions (RateLimitAction: continue, drop, transmit, or rewrite-IP-precedence-and-transmit/continue). Live traffic results are tracked via per-rule packet/byte counters for switched and filtered traffic and the current burst gauge (snPortCARStatSwitchedPkts/Bytes, snPortCARStatFilteredPkts/Bytes, snPortCARStatCurBurst), plus a companion agRateLimitCounterTable giving forwarded/dropped/remarked/total octet counts per interface and rule. This lets an operator verify that a configured rate limit is actually being enforced and see how much traffic it is dropping or remarking versus passing through. It depends on the IF-MIB (InterfaceIndex, ifIndex) and Brocade/Foundry's base FOUNDRY-SN-SWITCH-GROUP-MIB, and is deployed on Brocade FastIron switches doing per-port traffic-rate enforcement; network teams can download the FOUNDRY-CAR-MIB file to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in FOUNDRY-CAR-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 (formerly Foundry Networks) FastIron switches

Monitoring Examples

An operator polls snPortCARStatFilteredPkts and snPortCARStatCurBurst for a port with a configured rate-limit rule to see how much traffic is being dropped versus passing under the committed rate; a rapidly climbing snPortCARStatFilteredBytes counter alongside a burst gauge pegged near snPortCARExtLimit would indicate the port is being throttled hard enough to affect application performance.

What Can Be Monitored

per-rule committed rate and burst limits
conform/exceed action configuration
per-rule switched vs. filtered packet/byte counters
current burst size gauge
per-interface forwarded/dropped/remarked octet totals

Imported Objects

From FOUNDRY-SN-SWITCH-GROUP-MIB

snSwitch

MODULE-IDENTITY

From IF-MIB

InterfaceIndex
ifIndex	OBJECT-TYPE

From SNMPv2-SMI

Counter64
Gauge32
Integer32
MODULE-IDENTITY
OBJECT-TYPE

From SNMPv2-TC

TEXTUAL-CONVENTION

How to Use in IPNetwork Monitor

Example using snPortCARStatSwitchedPkts OID:

Select a Brocade/Foundry FastIron switch (Committed Access Rate traffic policing) 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 snPortCARStatSwitchedPkts 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 counter of packets permitted by this rate limit. 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 Counter64-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases sharply between polls relative to its normal baseline, since an unexpected spike often reflects a real change in traffic or activity. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
snCAR	1.3.6.1.4.1.1991.1.1.3.16			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.
snPortCARs	1.3.6.1.4.1.1991.1.1.3.16.1
snPortCARTable	1.3.6.1.4.1.1991.1.1.3.16.1.1		not-accessible	A table of rate limit configuration entries. Rate Limit is a method of traffic control. It allows a set of rate limits to be configured and applied to packets flowing into/out of an interface to regulate network traffic.
snPortCAREntry	1.3.6.1.4.1.1991.1.1.3.16.1.1.1		not-accessible	A collection of rate-limit configuration objects on this interface.
NUM snPortCARifIndex	1.3.6.1.4.1.1991.1.1.3.16.1.1.1.1	InterfaceIndex	read-only	The ifIndex value for this rate limit entry.
PAC snPortCARDirection	1.3.6.1.4.1.1991.1.1.3.16.1.1.1.2	PacketSource	read-only	The input or output transmission direction for the Rate Limit object. input (0), --for inbound traffic output(1) --for outbound traffic
INT snPortCARRowIndex	1.3.6.1.4.1.1991.1.1.3.16.1.1.1.3	INTEGER	read-only	The table index for rate limit objects. It increases as the rate limit entries are added. Skips the number when a row is deleted.
RAT snPortCARType	1.3.6.1.4.1.1991.1.1.3.16.1.1.1.4	RateLimitType	read-only	The type of traffic rate-limited against.
I32 snPortCARAccIdx	1.3.6.1.4.1.1991.1.1.3.16.1.1.1.5	Integer32	read-only	The index to the access list if RateLimitType is either quickAcc or standardAcc.
I32 snPortCARRate	1.3.6.1.4.1.1991.1.1.3.16.1.1.1.6	Integer32	read-only	The comitted access rate. This determines the long term average transmission rate. Traffic that falls under this rate always conforms. This is average rate in bits per second.
I32 snPortCARLimit	1.3.6.1.4.1.1991.1.1.3.16.1.1.1.7	Integer32	read-only	This is the normal burst size that determines how large traffic bursts can be before some traffic exceeds the rate limit. This specifies the number of bytes that are guaranteed to be transported by the network at the average rate under normal conditions during committed time interval. This normal burst size is in bytes.
I32 snPortCARExtLimit	1.3.6.1.4.1.1991.1.1.3.16.1.1.1.8	Integer32	read-only	This is the extended burst limit that determines how large traffic bursts can be before all the traffic exceeds the rate limit. This burst size is in bytes.
RAT snPortCARConformAction	1.3.6.1.4.1.1991.1.1.3.16.1.1.1.9	RateLimitAction	read-only	Action to be taken when the traffic is within the Rate Limit. drop drop the packet. xmit transmit the packet. continue continue to evaluate to the subsequent rate limits. precedXmit rewrite the IP precedence and transmit the packet. precedCont rewrite the IP precedence and allow it evaluated by subsequent rate limits.
RAT snPortCARExceedAction	1.3.6.1.4.1.1991.1.1.3.16.1.1.1.10	RateLimitAction	read-only	Action to be taken when the traffic exceeds the Rate Limit.drop drop the packet. xmit transmit the packet. continue continue to evaluate to the subsequent rate limits. precedXmit rewrite the IP precedence and transmit the packet. precedCont rewrite the IP precedence and allow it evaluated by subsequent rate limits.
C64 snPortCARStatSwitchedPktsEx	1.3.6.1.4.1.1991.1.1.3.16.1.1.1.11	Counter64	read-only	The counter of packets permitted by this rate limit.
C64 snPortCARStatSwitchedBytes	1.3.6.1.4.1.1991.1.1.3.16.1.1.1.12	Counter64	read-only	The counter of bytes permitted by this interface.
C64 snPortCARStatFilteredPkts	1.3.6.1.4.1.1991.1.1.3.16.1.1.1.13	Counter64	read-only	The counter of packets which exceeded this rate limit.
C64 snPortCARStatFilteredBytes	1.3.6.1.4.1.1991.1.1.3.16.1.1.1.14	Counter64	read-only	The counter of bytes which exceeded this rate limit.
G32 snPortCARStatCurBurst	1.3.6.1.4.1.1991.1.1.3.16.1.1.1.15	Gauge32	read-only	The current received burst size.
agRateLimitCounterTable	1.3.6.1.4.1.1991.1.1.3.16.1.2		not-accessible	A table of rate limit counter entries.
agRateLimitCounterEntry	1.3.6.1.4.1.1991.1.1.3.16.1.2.1		not-accessible	A collection of rate-limit counter objects on a interface, direction and configuration row index within that interface.
C64 agRateLimitCounterFwdedOctets	1.3.6.1.4.1.1991.1.1.3.16.1.2.1.1	Counter64	read-only	The forwarded octet count for this rate limit entry.
C64 agRateLimitCounterDroppedOctets	1.3.6.1.4.1.1991.1.1.3.16.1.2.1.2	Counter64	read-only	The dropped octet count for this rate limit entry.
C64 agRateLimitCounterReMarkedOctets	1.3.6.1.4.1.1991.1.1.3.16.1.2.1.3	Counter64	read-only	The remarked octet count for this rate limit entry.
C64 agRateLimitCounterTotalOctets	1.3.6.1.4.1.1991.1.1.3.16.1.2.1.4	Counter64	read-only	The total octet count for this rate limit entry.

RFC description

Brocade Committed Access Rate (CAR) MIB for traffic rate limiting and congestion control on Foundry switches.

Start monitoring Brocade/Foundry FastIron switch (Committed Access Rate traffic policing) 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-CAR-MIB