[j-nsp] Juniper BGP Route Metrics

[Piotr Marecki]

Hi Dan,

Are you using LDP ? Try "track-igp-metric" under [protocols ldp] stanza.

regards

Piotr Marecki

----- Original Message ----- 
From: "Dan Benson" <dbenson at swingpad.com>
To: <juniper-nsp at puck.nether.net>
Sent: Tuesday, May 15, 2007 10:08 PM
Subject: [j-nsp] Juniper BGP Route Metrics


> All, I am in a funny spot in my network where I could you a little 
> assistance.  I run a fairly widespread network in the US, where I peer 
> and buy upstream bandwidth in multiple locations in may cases with the 
> same Networks. 
> 
> We currently run OSPF as in IGP and carry IBGP over loopbacks for bgp 
> route distribution. Recently we have implemented MPLS for many obvious 
> reasons and in doing so changed the way our customer traffic flows 
> dramatically.  This from what I can tell is due to route preference, 
> where before MPLS a flow would be looked up at every hop and might be 
> handed to a connected AS more locally to the origination of the flow (A 
> good thing).  Now with MPLS when the flow is setup it is never looked at 
> again from an IP standpoint and therefore leaves my route preference 
> using the last resort, router-id.  This as anyone knows is plain old 
> wrong in this case and is hurting my traffic in more ways then one. 
> 
> Looking and testing I have had absolutely no luck setting the IBGP core 
> to use IGP metrics for route preference, nor have I had any luck with 
> external router id (At this point I will try anything).  My OSPF links 
> are all set with specific Metrics and flow just the way they should but 
> my hope is that I can get my BGP route table to use either the metric or 
> the metric2 as the last resort tie breaker for prefix next-hops instead 
> of the IBGP router-id.
> 
> I have tested this in junos 7.3 and 8.2 with no luck.  I have also tried 
> policies such as metric add 0 but still have no metrics in the bgp route 
> table.  Have I been assuming that this feature does something completely 
> different then what I have read it can do?  Does anyone out there have 
> any suggestions as to how to use the most locally (Closest OSPF metric'd 
> IBGP neighbor) learned next-hop for a prefix?  Am I left to manually set 
> all the metrics on outbound routes in my core to force each router to 
> use the more locally learned route? 
> 
> I thank you all for your help in advance and take care.. //db
> 
> 
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