Cisco 7604 Configuration Guide - Page 261
Transparent Firewall Requirements
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Chapter 14 Configuring Failover Understanding Failover If the entire switch fails, as well as the FWSM (such as in a power failure), then both the switch and the FWSM fail over to their secondary units (Figure 14-4). Figure 14-4 Switch Failure Internet VLAN 100 Failed FWSM Trunk VLAN 200 Active FWSM 132922 Eng VLAN 203 Mktg VLAN 202 Inside VLAN 201 Transparent Firewall Requirements To avoid loops when you use failover in transparent mode, you must use switch software that supports BPDU forwarding, and you must configure the FWSM to allow BPDUs. See the "Switch Hardware and Software Compatibility" section on page A-1 for switch software versions that allow BPDUs automatically. To allow BPDUs through the FWSM, configure an EtherType ACL and apply it to both interfaces according to the "Adding an EtherType Access List" section on page 13-9. Loops can occur if both modules are active at the same time, such as when both modules are discovering the presence of the other module, or due to a bad failover link. Because the FWSMs bridge packets between the same two VLANs, loops can occur when inside packets destined for the outside get OL-20748-01 Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM 14-7
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