[j-nsp] bgp multipath confusion
Cord MacLeod
cordmacleod at gmail.com
Wed Jul 15 20:22:26 EDT 2009
I guess I don't fully understand how this is supposed to work. I have
an ex4200 device with 4 links, 2 to each m7. Both m7s are acting as
route reflectors and advertising default to the ex4200. The loopbacks
are advertised with ISIS. However when I check BGP's summery and my
routing table, it seems multipath isn't working. Any thoughts?
ex4200:
root at crs1.sc1# show
type internal;
local-address 10.0.0.31;
export next-hop-self;
multipath;
neighbor 10.0.0.13 {
description "iBGP to edge1";
peer-as 64554;
}
neighbor 10.0.0.14 {
description "iBGP to edge2";
peer-as 64554;
Table Tot Paths Act Paths Suppressed History Damp
State Pending
inet.0 2 1 0 0
0 0
Peer AS InPkt OutPkt OutQ Flaps Last
Up/Dwn State|#Active/Received/Accepted/Damped...
10.0.0.13 64554 30 28 0 3
12:03 0/1/1/0 0/0/0/0
10.0.0.14 64554 58 57 0 3
12:03 1/1/1/0 0/0/0/0
0.0.0.0/0 *[BGP/170] 00:12:36, MED 0, localpref 100, from
10.0.0.14
AS path: 3561 I
> to 10.0.0.69 via ge-0/0/1.0
to 10.0.0.49 via ge-1/0/0.0
[BGP/170] 00:12:36, MED 0, localpref 100, from
10.0.0.13
AS path: 3561 I
> to 10.0.0.69 via ge-0/0/1.0
to 10.0.0.49 via ge-1/0/0.0
.49 and .69 are both /30 link addresses on 10.0.0.13. So the 2 links
in place on .14 aren't showing up.
Interface System L State Hold (secs) SNPA
ge-0/0/0.0 edge2.xxx 2 Up 23 0:1f:
12:d2:d0:db
ge-0/0/1.0 edge1.xxx 2 Up 24 0:1f:
12:d3:60:2
ge-1/0/0.0 edge1.xxx 2 Up 25 0:1f:
12:d3:60:db
ge-1/0/1.0 edge2.xxx 2 Up 19 0:1f:
12:d2:d0:2
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