Chapter 21: Layer 2 Troubleshooting; Troubleshooting Smlt Failure Using The Cli Or Acli - Avaya 8800 Troubleshooting Manual

Chapter 21: Layer 2 troubleshooting

Use this section to help you troubleshoot Layer 2 (VLAN, spanning tree, link aggregation, multilink
trunking) problems.

Troubleshooting SMLT failure using the CLI or ACLI

In typical SMLT topologies, critical network traffic runs over the aggregated links. Therefore,
SMLT failure can cause a partial network outage when network protocols such as VRRP,
OSPF, and RIP, and link layer protocols such as VLACP register SMLT links going down and
(potentially) recovering.
Possible reasons for SMLT failures are as follows:
• the CP-limit feature shuts down an SMLT link due to excessive control traffic
• the Extended CP-limit feature shuts down an SMLT link due to System Octapid
congestion
• IST link failure
• VLACP no longer receives VLACP PDUs from a peering device
• SLPP detects a network loop condition
• SMLT configuration errors
• Layer 1 connectivity problems with fiber or copper media
If an SMLT failure or link flap occurs, run the following diagnostic commands to determine the
SMLT status and identify a potential trigger for the issue.
Procedure steps
1. To display the status of the SMLT, enter the following CLI command:
2. To display the SMLT ports and verify their link integrity and status, enter the
Troubleshooting
show mlt info
OR
enter the following ACLI command:
show mlt
following CLI command:
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