I am not quite sure about "network <> backdoor" command in bgp. On one of our routers, we have
network 0.0.0.0 backdoor
Can somebody explain "network backdoor" in this context?
It means that this network will be advertised with an AD of 200 and so won't make it into the routing table as a BGP route if there is another protocol advertising it with a better AD
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it changes the administrative distance to 200. A common use is when you are learning a prefix via eBGP and via one IGP, therefore, it is going to be preferred via eBGP 20 is better than 110- OSPF, 115 IS-IS, 120 RIP or 90-170 EIGRP.
You would like to prefer the IGP route for whatever reason, then the backdoor could be useful here.
BGP backdoor feature is useful for modify the default routing behavior of BGP for specific networks in situations where we wish to route over a backdoor link, running some other normally less preferred IGP.
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