I have the following layout:
Internet <--> R1 <--> R2 <--> R3 <--> R4 <--> Internet
I have a customer attached to R3 for whom I am doing transit.
R1, R2, & R4 are GSR 12008 running 12.0(32)S14
R3 is a 3825 running 12.3(11)T5
At R4 everything is fine:
R4#sh ip rou a.b.c.0
Routing entry for a.b.c.0/22, supernet
Known via "bgp 1xx77", distance 200, metric 0
Tag 11xx1, type internal
Last update from x.y.z.242 1w5d ago
Routing Descriptor Blocks:
* x.y.z.242, from x.y.z.242, 1w5d ago
Route metric is 0, traffic share count is 1
AS Hops 1, BGP network version 0
Route tag 11xx1
R4#sh ip bgp a.b.c.0/22
BGP routing table entry for a.b.c.0/22, version 40711009
Bestpath Modifiers: always-compare-med, deterministic-med
Paths: (1 available, best #1)
Advertised to update-groups:
5
11xx1
x.y.z.242 (metric 143104) from x.y.z.242 (x.y.z.242)
Origin IGP, metric 0, localpref 100, valid, internal, best
However, at R1 the same route won't advertise:
R1#sh ip rou a.b.c.0
Routing entry for a.b.c.0/22, supernet
Known via "bgp 1xx77", distance 200, metric 0
Tag 11xx1, type internal
Last update from x.y.z.242 16:03:41 ago
Routing Descriptor Blocks:
* x.y.z.242, from x.y.z.242, 16:03:41 ago
Route metric is 0, traffic share count is 1
AS Hops 1, BGP network version 0
Route tag 11xx1
R1#sh ip bgp a.b.c.0/22
BGP routing table entry for a.b.c.0/22, version 406152
Bestpath Modifiers: always-compare-med, deterministic-med
Paths: (1 available, best #1)
Not advertised to any peer
11xx1
x.y.z.242 (metric 143360) from x.y.z.242 (x.y.z.242)
Origin IGP, metric 0, localpref 100, valid, internal, best
None of the issues that I have been able to find that might cause this
behaviour seem to apply. Any ideas on what more to look for?
--
Jerry Bacon
Senior Network Engineer
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