This document provides a sample configuration for single router mode redundancy and Border Gateway Protocol (BGP) on a Catalyst 6000 Multilayer Switch Feature Card (MSFC).
A good network design practice is to provide a Layer 2, as well as Layer 3, redundancy. A network with two Catalyst 6000 switches, each with two Supervisor engines and two MSFCs can provide the desired redundancy. The two Supervisor engines (one is active and one is standby) provide Layer 2 redundancy and the two MSFCs in each chassis provide Layer 3 redundancy. In addition, the two Catalyst 6000 chassis can be multihomed to two different ISPs using BGP, which provides additional redundancy in the event of a failure of an ISP.
There are a number of ways to configure redundancy in a Catalyst 6000:
This document provides a sample configuration for SRM redundancy in a Catalyst 6000 with dual Supervisors and MSFCs running CatOS System Software. In a multihomed BGP network with two Catalyst 6000 chassis, SRM redundancy provides the simplest configuration among the three possible options above.
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Readers of this document should be familiar with configuring BGP as well as Supervisor and MSFC redundancy configuration for Catalyst 6000 series switches. For more information on these topics, see the links in the Related Information