ERS8600 and ERS5650: SMLT Link Flapping

Doc ID		SOLN277690
Version:		1.0
Status:		Published
Published date:		28 Oct 2015

Author:

Harold Bodkin

Details

The users connected to the ERS 8600 Core switch were not able to forward traffic.

There was a SMLT loss in the node causing high broadcast levels. This caused the SMLT ports to go down.
CPU3 [12/10/12 11:31:21] SNMP INFO Link Down(1/33) due to excessive control frames
CPU3 [12/10/12 11:31:21] SNMP INFO Port 1/33 is a trunk port of mlt-2
CPU3 [12/10/12 11:31:21] CPU WARNING Shutting down port 1/33 due to excessive control frames multicast 0, broadcast 21317 packet per second
CPU3 [12/10/12 11:39:54] KHI TEST Logging idle test message.

Problem Clarification

There was a loop at the basement edge switch that causes excessive control traffic to be received at the core switch.

This caused SMLT and VRRP to flap and caused the connectivity issues with the end users.

Cause

This appears to be caused by a loop at the edge that sent excessive control traffic to the core.

Solution

-All connections were removed on the edge switch to stabilize the network.

-The site then added the connections back one at a time to identify the bad connection.

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