On 2/27/2013 4:28 PM, Randy wrote:
a stab in the dark:
on R1 BGP-
a)is auto-summary enabled?
or perhaps
b)aggregate-addr with summary-only?
No, neither of those apply in this case. Auto-summary is disabled, and
I'm not doing any aggregation.
./Randy
--- On Wed, 2/27/13, Jerry Bacon <[email protected]> wrote:
From: Jerry Bacon <[email protected]>
wrote:
On 2/27/13 3:24 PM, Jerry Bacon wrote:
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?
No IGP route to x.y.z.242 from R1 and BGP synchronization enabled?
Prefix-list or AS-path filter list on your EBGP neighbor on R1?
Next hop of R3 not reachable from EBGP neighbor (need next-hop-self?)
No-export community getting applied by a route-map?
I'm using EIGRP as my IGP, synchronization is disabled, and
there is a good route to R3:
R1#sh ip rou x.y.z.242
Routing entry for x.y.z.242/32
Known via "eigrp 100", distance 170, metric 143360,
type external
Redistributing via eigrp 100
Last update from 10.1.25.130 on
GigabitEthernet2/0.283, 16:44:58 ago
Routing Descriptor Blocks:
* 10.1.25.130, from 10.1.25.130, 16:44:58 ago, via
GigabitEthernet2/0.283
Route metric is 143360, traffic share count is 1
Total delay is 5020 microseconds, minimum bandwidth is 172413 Kbit
Reliability 255/255, minimum MTU 1514 bytes
Loading 23/255, Hops 2
I've tried with and without next-hop-self on R3, it doesn't
seem to make any difference.
On R1, I have:
ip as-path access-list 16 permit ^$
ip as-path access-list 16 permit ^11xx1
ip as-path access-list 16 deny _11xx1_
ip as-path access-list 16 permit .*
On R4, I have:
ip as-path access-list 10 permit ^11xx1
ip as-path access-list 10 deny _11xx1_
ip as-path access-list 10 permit .*
I had to do this to keep from doing transit of other routes
from this customer.
--
Jerry Bacon
Senior Network Engineer
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