Re: Interesting EIGRP Scenario

Lab it up. What I found was if you want the external routes (bgp
redistro) to be less preferred, create distance command under bgp with
the neighbor tied to an access-list.

Send me a topo and sanitized configs, I ran into something similar and
it sounds familiar to me.

Let me know,
JB

Sent from my iPhone

On Jun 13, 2011, at 8:39 PM, "Laidlaw, Patrick A."
<Patrick.Laidlaw_at_wwt.com> wrote:

> Well members I've been stumping my way through a scenario that has been
> driving me nuts all afternoon.
>
> MPLS cloud and Tunnel cloud .
>
> I had a route that was getting advertised as an internal eigrp network of
> 10.2.4.0/24 over the tunnel preferred route R3. The network was also learned
> over the MPLS BGP neighbor on a different router R1 and redistributed into
> eigrp. R2 would learn the route from R3 as eigrp internal and from R1 as
> eigrp external. R1 R2 and R3 are connected in a triangle.
>
> ROUGH TOPOLOGY:
> /--------------10.1.4.0/24------------\
> / \
> Tunnel R3-gig-R2-gig-R1 MPLS AS200
> \--fastE----/
>
> If R3 ever hiccupped and the Tunnel was down a loop would occur. After the
> tunnel came back up, eigrp would show that R1 advertized the network to R2 as
> Eigrp internal, that R2 advertized the network as eigrp internal on R3, and
> that R3 advertized the network to R1 as eigrp internal.
>
> The weird thing is the route now shows a tag of 200 after the tunnel came back
> up. I could shut this tunnel down again and it would still show everything as
> eigrp internal instead of being advertised as external from BGP to EIGRP on
> R1.
>
> I've got a temporary solution of kicking the Delay way up on the Fast E
> between the R3 and R1 but I'm a bit baffled at this point why or what process
> is going on that would keep the network advertised as eigrp internal and then
> tag it with 200 off the external redistributable route from BGP
>
>
> Patrick Laidlaw - Deployment Engineer
> E: patrick.laidlaw_at_wwt.com<mailto:patrick.laidlaw_at_wwt.com>
>
>
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Received on Mon Jun 13 2011 - 20:50:38 ART