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Explorer

bgp network backdoor

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?

5 REPLIES 5
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Advisor

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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Rising star

Hi
in addition think of it lime this tht it used to prefer route learned from igp thn bgp


Sent from Cisco Technical Support iPhone App

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Participant

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.

Highlighted

Hi Jose,

correct!

Plus the backdoor route is not advertised via BGP.

BR,

Milan

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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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