Refer to Cisco Technical Tips Conventions for more information on document conventions. If your network is live, make sure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment. The information in this document is based on Cisco 2500 Series Routers that run Cisco IOS ? Software Release 12.2(27). Prerequisites RequirementsĮnsure that you have knowledge of these topics before you attempt this configuration:
This document addresses this issue, with appropriate configuration examples. This causes Internet traffic to pass through your AS and potentially consume all of the bandwidth and resources on the CPU of your router. When you are running BGP with more than one service provider, you run the risk that your autonomous system (AS) will become a transit AS. It selects the ISP which offers the best path to a resource. Multihoming provides redundancy and network optimization. When you connect your network to two different Internet service providers (ISPs), it is called multihoming.
Border Gateway Protocol (BGP) is one of the key protocols to use to achieve Internet connection redundancy.
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