From: John (jgarrison1@austin.rr.com)
Date: Tue Feb 26 2008 - 03:28:48 ARST
I will assume that R1 and R3 are in different AS's.
Use loopbacks(the most reliable interface on the router) in the neighbor
statements on R1 and R3. You'll also have to give the neigh x.x.x.x
update-source loopback0 and neigh x.x.x.x ebgp multihop commands . Then if
the frame link goes down R1 and R3 will peer as long as the links from R2
stay up.
http://www.cisco.com/en/US/docs/ios/12_4/ip_route/command/reference/rte_bgh2.html#wp1073770
http://www.cisco.com/en/US/docs/ios/12_4/ip_route/command/reference/rte_bgh2.html#wp1071849
----- Original Message -----
From: "CJ" <693455@gmail.com>
To: "Cisco certification" <ccielab@groupstudy.com>
Sent: Monday, February 25, 2008 10:43 PM
Subject: BGP aggregate
> bb1--R1---ppp---R2
> | /
> FR __ /
> |
> R3-NetA
>
> BGP is running between;
> BB1-R1
> R1-R3
> only
> R2 is an IGP of OSPF
>
> R1 is advertising a aggregate to BB1 the net. 155.10.0.0/16. Net A (
> 155.10.3.0/24) is advertised to BGP in R3 so R1 has this route in the BGP
> table. The link to FR from R1 goes down. BGP is red. to OSPF in R1 and R3.
> In this case how will the aggregate be advertised to BB1 if R1 no longer
> has
> the Net A in the BGP table due to the FR link going down. We are not
> allowed
> to advertise any other network to BGP.
> Anyone have any good ideas?
> CJ
>
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