BGP advertised-routes question

[julxu]

hi

I still do not understand how BGP advese the routes.

I have logged into B router and it advices b class address to external link A router with eBGP:

Network

*>i111.222.0.0

*>111.222.333.0/24

which 111.222.0.0 from iBGP in another internal router, C router, and 111.222.333.0/24 is a interface in B router.

if the link between B and C down, than what will happen for route 111.222.0.0? will it dispear, or it still existed becase of 111.222.33.0/24 is existed?

Any comments will be appreicated

Thanks in advace

julxu

[Richard Burts]

julxu

BGP can only advertise routes which are present in the routing table of the local router. If the link to router C goes down and if there is not anything that will maintain the route for 111.222.0.0 in the routing table of router B then BGP will withdraw the advertisement for 111.222.0.0.

HTH

Rick