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The %CSM_SLB-4-TOPOLOGY error message is received on the CSM of a Cisco Catalyst 6500 Series switch running CatOS software

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Core issue

The %CSM_SLB-4-TOPOLOGY error message occurs if the Content Switching Module (CSM) detects a bridge loop in the network.

The full error message looks similar to this:

%CSM_SLB-4-TOPOLOGY: Module 6 warning: ARP frame from
10.208.136.6 received on VLAN 234

Resolution

In order to resolve this issue, check the bridging device and the bridge-mode configurations of multiple CSMs located in the network.

Note: When a CSM is out of service, the module still replies to Address Resolution Protocol (ARP) requests but not to pings.