Working with Chassis High Availability in Bridge Mode

When a Dual Chassis 61000/41000 Security System deployment is in Active/Standby mode, only the Active Chassis handles traffic. The 61000/41000 Security System maintains a MAC shadow table that caches MAC addresses handled by the system. When Chassis failover occurs, the new Active Chassis generates advertisement packets with the cached MAC addresses. This lets remote switches "learn" the MAC address, and start to forward STP bridge traffic.