RBN-AAL5-VCL-STAT-MIB

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Organization: RedBack Networks, Inc.

Last Updated: 1998-04-17

Category: ATM, Vendor: Ericsson

Description: Collects ATM Adaptation Layer 5 VCL traffic statistics on Redback SmartEdge platforms.

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What Is RBN-AAL5-VCL-STAT-MIB?

RBN-AAL5-VCL-STAT-MIB is a private MIB from Redback Networks (SmartEdge platform) that collects extended ATM Adaptation Layer 5 (AAL5) Virtual Channel Link traffic statistics beyond what standards-track ATM MIBs provide. It exposes a statistics table per VCL reporting counters such as outbound cell/packet drops. It is a performance/fault-counter MIB used to monitor the software/hardware forwarding health of ATM virtual circuits, specifically identifying VCLs that are dropping traffic due to congestion or misconfiguration. It explicitly extends standards-track ATM MIBs (such as the ATM-MIB and AAL5 MIB per RFC 2515) by supplementing counters not covered there. It is typically deployed on Redback SmartEdge broadband aggregation routers carrying ATM-based subscriber traffic (e.g., DSL backhaul). Network engineers evaluating or troubleshooting this functionality can download the RBN-AAL5-VCL-STAT-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in RBN-AAL5-VCL-STAT-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

Redback Networks SmartEdge broadband aggregation routers

Monitoring Examples

An administrator would poll rbnAtmAal5VclStatTable entries to check rbnAtmAal5VclOutDrops per virtual channel link, identifying which VCLs are discarding outbound cells due to congestion or buffer exhaustion. A steadily increasing drop counter on a specific VCL while others remain at zero would reveal a localized subscriber circuit or upstream provisioning problem rather than a systemic router issue.

What Can Be Monitored

per-VCL outbound cell/packet drops
AAL5 VCL traffic statistics

Imported Objects

From ATM-MIB

atmVclVci	OBJECT-TYPE
atmVclVpi	OBJECT-TYPE

From IF-MIB

ifIndex

OBJECT-TYPE

From RBN-SMI

rbnMgmt

OBJECT-IDENTITY

From RBN-X-AAL5-VCL-STAT-MIB

rbnXAtmAal5VclStatEntry

OBJECT-TYPE

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
MODULE-IDENTITY
OBJECT-TYPE

How to Use in IPNetwork Monitor

Example using rbnAtmAal5VclOutDrops OID:

Select a Redback Networks broadband aggregation router 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 rbnAtmAal5VclOutDrops 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 chosen to be dropped on this VCC's transmit path even though no errors were detected. 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
rbnAal5VclStatMIB	1.3.6.1.4.1.2352.2.1			The MIB for instrumenting statistics associated with an ATM VCL beyond those instrumented by standards-track MIBs.
rbnAal5VclStatMIBObjects	1.3.6.1.4.1.2352.2.1.1
rbnAtmAal5VclStatTable	1.3.6.1.4.1.2352.2.1.1.1		not-accessible	This table provides a collection of auxiliary objects providing AAL5 configuration and performance statistics of a VCL.
rbnAtmAal5VclStatEntry	1.3.6.1.4.1.2352.2.1.1.1.1		not-accessible	Each entry in this table represents a VCL.
C32 rbnAtmAal5VclOutDropsEx	1.3.6.1.4.1.2352.2.1.1.1.1.1	Counter32	read-only	The number of AAL5 CPCS PDUs received for transmission on the AAL5 VCC at the interface identified by the ifIndex which were chosen to be dropped even though no errors had been detected to prevent their being transmitted. One possible reason for dropping such a PDU could be a lack of available space on the interface output queue.
rbnAal5VclStatMIBConformance	1.3.6.1.4.1.2352.2.1.2
rbnAal5VclStatMIBGroups	1.3.6.1.4.1.2352.2.1.2.1
rbnAal5VclStatGroup	1.3.6.1.4.1.2352.2.1.2.1.1			A collection of objects providing supplemental AAL5 VCL information beyond that supplied by IETF standards-track MIBs
rbnAal5VclStatMIBCompliances	1.3.6.1.4.1.2352.2.1.2.2
rbnAal5VclStatMIBCompliance	1.3.6.1.4.1.2352.2.1.2.2.1			The compliance statement for RedBack Networks SNMP entities which represent AAL5 VCL statistics

RFC description

ATM AAL5 virtual circuit link (VCL) statistics beyond standard MIB instrumentation.

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Download RBN-AAL5-VCL-STAT-MIB