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Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide
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Chapter 17 Monitoring and Troubleshooting the Firewall Services Module
Troubleshooting the Firewall Services Module
Symptom When the FWSM fails over, the secondary unit does not pass traffic.
Possible Cause You did not assign the same VLANs for both units.
Recommended Action Make sure to assign the same VLANs to both units in the switch configuration.