CISCO-AAL5-EXT-MIB

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Organization: Cisco Systems, Inc.

Last Updated: 2001-11-05

Category: ATM

Description: Extends standard ATM AAL5 management with Cisco-specific counters and parameters.

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What Is CISCO-AAL5-EXT-MIB?

CISCO-AAL5-EXT-MIB is a Cisco-specific extension to the standard RFC 1695 ATM AAL5 MIB, adding extra per-VCC (virtual channel connection) performance counters on Cisco ATM-capable routers and switches. It exposes performance and error-counter data for AAL5 virtual circuits, including dropped packets, dropped octets, and dropped/total cell counts on both the incoming and outgoing directions. This data is directly used to monitor the operational health of ATM hardware interfaces and software forwarding paths, since rising drop counters on a VCC reveal congestion, cell-level errors, or an interface nearing its performance limits well before a circuit fails outright. It explicitly extends RFC 1695 (the standard AAL5 MIB), so it depends on that base ATM MIB for VCC identification and core statistics. It is typically deployed on Cisco ATM edge/core routers carrying AAL5-encapsulated traffic in legacy ATM WAN environments. Engineers can download the CISCO-AAL5-EXT-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-AAL5-EXT-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

Cisco ATM-enabled routers/switches

Monitoring Examples

The cAal5ExtVccTable/cAal5ExtVccEntry is indexed per virtual channel connection and holds counters such as cAal5VccInDroppedPkts, cAal5VccOutDroppedPkts, cAal5VccInDroppedCells, and cAal5VccOutDroppedCells. An administrator would poll these counters over time on a given VCC to detect a rising rate of dropped cells or octets, which signals congestion, a policing violation, or an underlying hardware issue on that ATM circuit before it causes a service outage.

What Can Be Monitored

AAL5 VCC dropped packets (in/out)
AAL5 VCC dropped octets (in/out)
AAL5 VCC cell counts (in/out)
AAL5 VCC dropped cells (in/out)

Imported Objects

From ATM-MIB

aal5VccEntry

OBJECT-TYPE

From CISCO-SMI

ciscoMgmt

OBJECT-IDENTITY

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
MODULE-IDENTITY
OBJECT-TYPE

How to Use in IPNetwork Monitor

Example using cAal5VccInDroppedPkts OID:

Select a Cisco ATM-enabled routers/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 cAal5VccInDroppedPkts 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 number of AAL5 CPCS PDUs dropped at the receive side of this AAL5 VCC at the interface associated with an AAL5 entity. 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
cAal5ExtConnections	1.3.6.1.4.1.9.9.9999.1.1
cAal5ExtVccEntry	1.3.6.1.4.1.9.9.9999.1.1.1.1		not-accessible	This list contains the additional AAL5 VCC performance parameters beyond that provided by aal5VccEntry defined in RFC1695.
cAal5ExtVccTable	1.3.6.1.4.1.9.9.9999.1.1.1		not-accessible	This table contains AAL5 VCC performance parameters beyond that provided by aal5VccEntry defined in RFC1695 and AAL5 MIB.
C32 cAal5VccInCells	1.3.6.1.4.1.9.9.9999.1.1.1.1.5	Counter32	read-only	The number of AAL5 SAR cells received on this AAL5 VCC at the interface associated with an AAL5 entity.
C32 cAal5VccInDroppedCells	1.3.6.1.4.1.9.9.9999.1.1.1.1.7	Counter32	read-only	The number of AAL5 SAR cells dropped at the receive side of this AAL5 VCC at the interface associated with an AAL5 entity.
C32 cAal5VccInDroppedOctets	1.3.6.1.4.1.9.9.9999.1.1.1.1.3	Counter32	read-only	The number of AAL5 CPCS PDU Octets dropped at the receive side of this AAL5 VCC at the interface associated with an AAL5 entity.
C32 cAal5VccInDroppedPktsEx	1.3.6.1.4.1.9.9.9999.1.1.1.1.1	Counter32	read-only	The number of AAL5 CPCS PDUs dropped at the receive side of this AAL5 VCC at the interface associated with an AAL5 entity.
C32 cAal5VccOutCells	1.3.6.1.4.1.9.9.9999.1.1.1.1.6	Counter32	read-only	The number of AAL5 SAR cells transmitted on this AAL5 VCC at the interface associated with an AAL5 entity.
C32 cAal5VccOutDroppedCells	1.3.6.1.4.1.9.9.9999.1.1.1.1.8	Counter32	read-only	The number of AAL5 SAR cells dropped at the transmit side of this AAL5 VCC at the interface associated with an AAL5 entity.
C32 cAal5VccOutDroppedOctets	1.3.6.1.4.1.9.9.9999.1.1.1.1.4	Counter32	read-only	The number of AAL5 CPCS PDU Octets dropped at the transmit side of this AAL5 VCC at the interface associated with an AAL5 entity.
C32 cAal5VccOutDroppedPkts	1.3.6.1.4.1.9.9.9999.1.1.1.1.2	Counter32	read-only	The number of AAL5 CPCS PDUs dropped at the transmit side of this AAL5 VCC at the interface associated with an AAL5 entity.
ciscoAal5ExtMIB	1.3.6.1.4.1.9.9.9999			This MIB is the RFC 1695 extension for Cisco product. It provides the additional AAL5 performance statistics of a VCC from RFC 1695.
ciscoAAL5ExtMIBCompliance	1.3.6.1.4.1.9.9.9999.2.1.1			The compliance statement for entities which implement this Cisco AAL5 EXT MIB.
ciscoAAL5ExtMIBCompliances	1.3.6.1.4.1.9.9.9999.2.1
ciscoAAL5ExtMIBConformance	1.3.6.1.4.1.9.9.9999.2
ciscoAal5ExtMIBGroup	1.3.6.1.4.1.9.9.9999.2.2.1			A collection of objects providing these extra AAL5 interface related statistics.
ciscoAAL5ExtMIBGroups	1.3.6.1.4.1.9.9.9999.2.2
ciscoAal5ExtMIBObjects	1.3.6.1.4.1.9.9.9999.1

RFC description

Cisco vendor-private extension MIB for AAL5 (ATM Adaptation Layer 5) performance monitoring and statistics collection.

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Download CISCO-AAL5-EXT-MIB