[c-nsp] cost community alternatives

Sun May 2 11:13:17 EDT 2010

...coming back to this issue, and let's presume that sparse-mode pim is enabled as well on all eigrp backdoor links.
what could be a safe migration plan in order to transfer all multicast traffic though my mpls core network?
I presume that i have to force both pim multicast as well as unicast traffic to follow the same path through my core in order to not fall into a lot of RPF failures scenarios. Is it possible to tweak pim in order to also prefer this same mpls path?

Thnx.

Date: Wed, 14 Apr 2010 14:32:20 -0700
Subject: Re: [c-nsp] cost community alternatives
From: kenny.sallee at gmail.com
To: panvangels at hotmail.com
CC: cisco-nsp at puck.nether.net

What if you used a different routing protocol on the backdoor link and redistributed (carefully) between EIGRP and the diff routing protocol on the backdoor router at each location?  You'd have external EIGRP routes everywhere then and could create different seed metrics at the MPLS border (CE router) and on the backdoor routers to automagically prefer one path over the other.   You'd have to tag routes at points of redistribution and filter them on CE router (keep site B's routes from being advertised via BGP on CE router at site A and vice versa for example).  A little messy but works.  

Kenny

On Wed, Apr 14, 2010 at 2:16 PM, Pan vangels <panvangels at hotmail.com> wrote:

Thanks Luan.

I tried indeed and it worked.

However, since offset-list actually modifies the metric and all those ext eigrp routes are still viewable with an AD of 170, how does it happen for them to be preferable over internal eigrp ones??

Finally what is the difference of an offset-list when compared to a route-map setting a low metric for external routes while redistributing from ebgp to eigrp?

Cheers,

Pan

-------------------------------------

Try using the offset list command.

Regards,

-------------------------------------

Luan Nguyen

Chesapeake NetCraftsmen, LLC.

------------------------------------

-----Original Message-----

From: cisco-nsp-bounces at puck.nether.net

[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Pan vangels

Sent: Monday, April 12, 2010 1:57 PM

To: cisco-nsp at puck.nether.net

Subject: [c-nsp] cost community alternatives

If 1) ebgp is used as PE-CE protocol, 2) eigrp is used into customer's

network, and 3) a backdoor link exists between CE routers, is there any way

of external eigrp routes coming from ebgp into eigrp to be prefered over

normal eigrp routes advertised through the backdoor link?

Distance command would do the trick but this has to be defined on all

internal customer routes.

On the other way cost community is not extendable over an ebgp session...

Thnx,

Pan

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