Hi Experts! I have some problem with a BGP feature called Conditional
Advertisement. It has got a "wierd" (or i don't know how does it work)
behavior in my scenario... :)Topology: R1 ======= R3|
|R2 ======= R4 R1-R2 and R3-R4 iBGP peers, R1-R3 and R2-R4 are eBGP peers.By
default all traffic goes through the R1-R3 links (2 links). If one of the
primary link beetween the R1-R3 is down, I would like to reroute the traffic
to the backup links (2 links) beetween R2-R4.I would like to achieve the
following:In normal case R1 advertise routes with as-path prepend (nei x.x.x.x
route-map ADVERTISE). route-map ADVERTISEmatch ip address prefix-list
SUBNETSset as-path prepend y y If there is a link issue, R1 advertise routes
with as.path prepend (nei x.x.x.x advertise-map NEW exist CHECK)route-map
ADVERTISEmatch ip address prefix-list SUBNETS This scenario is not working
because if there is a link failure, R1 does not advertise any routes.
I think The route-map maybe "supressed" by the advertise-map (if in the
ADVERTISE route-map there are another prefixes it works fine) Do you have any
idea what coudl be the problem? Or how to solve this? In advance Thanks for
your help Best Regards,Attila
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