From the course: Cisco CCNP ENARSI v1.1 (300-410) Cert Prep: 2 VPN Technologies

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Influencing path selection

Influencing path selection

From the course: Cisco CCNP ENARSI v1.1 (300-410) Cert Prep: 2 VPN Technologies

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Influencing path selection

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- [Instructor] We now want to take a look at some ways that we can influence a BGP path selection. There are some special cases where we may need to override certain BGP default behaviors and we're going to look at some of the ways that we can do that. In this first topology, we're using a couple of routers R1, an autonomous system 65100 and R2 an autonomous systems, 65200. They're connected over a 10.1.1.0/24 network and they're advertising their respective loop back addresses that we can see here on the topology. Loop back 1.1.1.1 for router one. And Loop back 2.2.2.2 for router two. Let's first look at using the local dash AS command. This allows BGP sessions to be established using an alternate autonomous system number. Then the one under which the BGP process is running. This is helpful in cases where maybe you have a couple of corporate entities or maybe their ISP and they're merging together and you need an autonomous system to appear as though it's running under an alternate…

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