topic Re: bgp network backdoor in Routing and SD-WAN

bgp network backdoor

Kashish_Patel — Tue, 05 Mar 2019 02:46:42 GMT

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?

bgp network backdoor

cadet alain — Sun, 20 Jan 2013 15:36:50 GMT

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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Re: bgp network backdoor

mahmoodmkl — Sun, 20 Jan 2013 17:45:09 GMT

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

bgp network backdoor

Jose Jara — Mon, 21 Jan 2013 10:47:42 GMT

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.

Re: bgp network backdoor

chamara siyambalapitiya — Mon, 21 Jan 2013 10:56:57 GMT

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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bgp network backdoor

milan.kulik — Mon, 21 Jan 2013 11:55:33 GMT

Hi Jose,

correct!

Plus the backdoor route is not advertised via BGP.

BR,

Milan