[nsp] eBGP multipath
Jean-Christophe VARAILLON
jcvaraillon at dolnet.gr
Tue Mar 2 09:59:55 EST 2004
Hi
I have some trouble getting multi paths from eBGP into the FIB.
After I used the "maximum-paths 2" command, I cleared all BGP sessions
and then I disabled and re-enabled CEF.
I do get the same subnet from the same AS, but there is only one prefered....
Router-A#sho ip route
-----
* 17.255.232.0/24 10.0.0.50 0 1111 2222 701 i
*> 10.0.0.51 0 1111 3333 701 i
----
... and this is confirmed within the FIB:
Router-A#sho ip route 17.255.232.0 255.255.255.0
-----
Routing entry for 17.255.232.0/24
Known via "bgp 65001", distance 20, metric 0
Tag 1111, type external
Last update from 10.0.0.51 00:40:18 ago
Routing Descriptor Blocks:
* 10.0.0.51, from 10.0.0.51, 00:40:18 ago
Route metric is 0, traffic share count is 1
AS Hops 3
-----
Here is the config of Router-A:
------
router bgp 65001
no synchronization
bgp log-neighbor-changes
network 192.168.0.0
neighbor 10.0.0.50 remote-as 1111
neighbor 10.0.0.50 update-source Loopback 0
neighbor 10.0.0.50 distribute-list 50 out
neighbor 10.0.0.50 filter-list 60 in
neighbor 10.0.0.51 remote-as 1111
neighbor 10.0.0.51 update-source Loopback 0
neighbor 10.0.0.51 distribute-list 50 out
neighbor 10.0.0.51 filter-list 60 in
maximum-paths 2
no auto-summary
access-list 50 permit 192.168.0.0 0.0.0.255
ip as-path access-list 60 permit ^1111$
ip as-path access-list 60 permit ^1111_[0-9][0-9]*$
ip as-path access-list 60 permit _701$
ip as-path access-list 60 deny .*
-----------------
Router-A is a cisco 7204, running the IOS (C7200-P-M), Version 12.2(15)T11.
Any suggestions are very much welcome.
Thank you.
Christophe
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