Cisco 7604 Configuration Guide - Page 258
Inter-Chassis Failover, Intra-Switch Failover
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Understanding Failover Chapter 14 Configuring Failover Figure 14-1 shows a typical intra-switch configuration. Figure 14-1 Intra-Switch Failover Internet Switch VLAN 100 VLAN 200 Active FWSM Failover VLAN 10 State VLAN 11 VLAN 201 Standby FWSM Inside 132919 Inter-Chassis Failover To protect against switch-level failure, you can install the secondary FWSM in a separate switch. FWSM does not coordinate failover directly with the switch, but it works harmoniously with the switch failover operation. See the switch documentation to configure failover for the switch. To accommodate the failover communications between FWSMs, we recommend that you configure a trunk port between the two switches that carries the failover and state VLANs. The trunk ensures that failover communication between the two units is subject to minimal failure risk. For other VLANs, you must ensure that both switches have access to all firewall VLANs, and that monitored VLANs can successfully pass hello packets between both switches. Figure 14-2 shows a typical switch and FWSM redundancy configuration. The trunk between the two switches carries the failover FWSM VLANs (VLANs 10 and 11). Note FWSM failover is independent of the switch failover operation; however, FWSM works in any switch failover scenario. 14-4 Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM OL-20748-01
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