The FWSM has the capability to operate in a routed mode or in transparent mode. Using 3.1 code, both functions are supported simultaneously, offering maximum flexibility. Transparent mode appears as a Layer 2 bridge and minimizes IP address changes when inserting into an existing network. In single-routed mode, the FWSM supports OSPF, RIP, static routes, BGP stub, and with the release of the 4.x code train, EIGRP will also be supported. When the FWSM is operating in multi-context routed mode, the routing options are limited to static routes and BGP stub.

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