[c-nsp] problem eith EIGRP and BGP

[sanju shastri]

HI Oli,

Thx for replying , that really a good option . i was not awrae of the same.

i would like to share my solution with you..

What i have done i have created a route map in which i have permitted the
subnets for which i need to change the AD while using a prefix list.

then i redistributed eigrp into bgp using that route map.
now what it does i have two route in bgp one from EBGP peer and second from
the local BGP (this originally came from the eigrp , the redistributed one )


now the bgp path selection comes into picture and selects the the local bgp
route coz of higher weight.

BGP give ip routing table a local bgp route with AD 200.
Now routing table selects the route from eigrp coz of lesser AD i.e 90 or
170 couls be internal or external.

I have achieved the traffic flow from the route learned from the eigrp
route.

But here comes the problem abt convergence , if the EIGRP neighbour goes
down  then EBGP route comes into effect and traffic goes from it bur when it
comes back again the routing table does not select the eigrp route .

Any suggestions what could be cause of problem.

Regards,
Sanju


On 5/13/07, Oliver Boehmer (oboehmer) <oboehmer at cisco.com> wrote:
>
> sanju shastri <> wrote on Sunday, May 13, 2007 10:09 AM:
>
> > HI all,
> >
> > I have a scenario in which a SP is giving L3 MPLS VPN to client having
> > multiple locations.
> >
> > Now thw client is running EIGRP in his network and EBGP with SP.
> >
> >
> > ON HUB location routes learned by router for remote branches via
> > EIGRP is having an AD of 90 and learnned from EBGP are having a AD of
> > 20. Becasuse of same the EBGP routes are given preference in any case.
> >
> > The client wants to give preference to routeds leaned by local EIGRP
> > and want to make MPLS VPN link as a failover/secondary.
> >
> > well I can change AD for the EBGP session but it will reflected to
> > all the subnet where i want it for some specific subnet.
>
> you can selectively adjust the distance for specific subnets using the
>
> distance <distance> 0.0.0.0 255.255.255.255 <acl>
>
> command (within router bgp), where you define the networks you want to
> change the distance of in the access-list referenced there.
>
> Not knowing details about the topology, but you might also be successful
> when you increase eBGP admin distance from 20 to 100 or so, which is
> higher than EIGRP internal distance (90), but lower than EIGRP's
> external one (170). This way, only internal EIGRP prefixes (i.e.
> originated within the same site) are preferred, while external ones
> (possibly received from remote sites via the L3VPN) are preferred
> through the local eBGP connection (with a backup to the redundant hub
> router redistributing those into EIGRP).
>
>         oli
>