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exo 2.4.3

Hi,

In question 2.4.3 when the links btw A1 and B1 fails, it is said that when A1 and B1 detects the failure, A1 and B1 will delete the entries learned over this link from their RIB-in tables, and update related entries in their forwarding tables. Up to now I have no problems. But after, it is said that they will also advertise the changes (I-BGP) to other BGP routers within their domains. What do they actually advertize? The routes they have now are routes learnt by I-BGP from A4 and B4 respectively, so they shouldn't be advertising them. Am I missing sthg?

Thank you very much for your help.

Best,

Ghita
Posted by Ghita Mezzour on Tuesday 5 December 2006 at 21:06
Comments
>The routes they have now are routes learnt by I-BGP from A4 and B4 >respectively, so they shouldn't be advertising them. Am I missing sthg?


Some of the routes they (A1 and B1) have now in Loc-RIB table (so active routes) are learned by E-BGP over the just invalidated link: at A1 routes toward 201.89, at B1 routes toward both 133.29 and 133.30. Corresponding entires in Loc-RIB and Adj-RIB-out will be deleted, then...

(Maybe you got confused with solution tables from 2.4.2.c, which are for A3 and B3?)
Posted by Slavisa Sarafijanovic on Wednesday 6 December 2006 at 7:36