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Same BGP AS usable in disconnected Internet Networks?

Hello, I have a scenario to explore, regarding using the same AS number for a different deployment of BGP. I will simplify it for discussion.

Scenario: Two routers, one at each internet-connected site, both running BGP to the ISP, using the same AS number. These routers are running different “internal” /24 networks, which will be announced to the internet. These two routers are _NOT_ connected to each other via some sort of backbone, or private WAN circuit. Can I use the same AS number for both BGP deployments? Any config guidance you can provide is appreciated.

NOTE: Internal networks = public network local to each sites internet presence.

Thx,

WR

1 REPLY

Re: Same BGP AS usable in disconnected Internet Networks?

Yes you can use same ASN for two sites with different network.

If you want both sites to reach each other thru internet;

1. If you are receiving full routes from your ISP, you have to configure them with the "allowas-in".

2. If you only received default route from your ISP, it should be fine.

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