01-20-2013 07:07 AM - edited 03-04-2019 06:46 PM
I am not quite sure about "network <> backdoor" command in bgp. On one of our routers, we have
network 0.0.0.0 backdoor
network 10.0.0.0
network 192.168.0.0
Can somebody explain "network backdoor" in this context?
01-20-2013 07:36 AM
Hi,
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
Regards.
Alain
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01-20-2013 09:45 AM
Hi
in addition think of it lime this tht it used to prefer route learned from igp thn bgp
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01-21-2013 02:47 AM
Hello,
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.
HTH,
Jose.
01-21-2013 03:55 AM
Hi Jose,
correct!
Plus the backdoor route is not advertised via BGP.
BR,
Milan
01-21-2013 02:56 AM
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.
Regards
Chamara
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