What software version do you use? I've seen routing troubles with
software prior to 9.6R2/9.5R3
Cyrill
On 03.02.2010 23:50, Stacy W. Smith wrote:
It sounds like the forwarding table may not be in sync with the routing table
during this time. You can check the Routing Engine's view of the forwarding
table with:
show route forwarding-table destination 10.10.134.0 extensive
That output may help you determine if it's the Routing Engine or the PFE that
has an incorrect forwarding entry.
--Stacy
On Feb 3, 2010, at 12:53 PM, Cord MacLeod wrote:
I have a very strange routing issue in progress. The short of it is, I am advertising
10.10.134.0/24 from gsw1.xxx with BGP, which is an ex4200 6 member switch. I advertise
this to crs1.xxx which is an ex4200 2 member switch and a route reflector. When one of
the crs1.xxx member switches dies, all routing dies as expected. However when routing
re-establishes for some reason 10.10.134.0/24 is no longer reachable even though a route
exists for this network in BGP through out the whole network. crs1.xxx even claims
"no route to host" even when showing a route in it's routing table.
When the 2nd member of crs1.xxx comes back online, everything is fixed.
Obviously this is a major issue because I now essentially have no redundancy at
my aggregation layer, crs1.xxx.
Here's normal operation:
r...@crs1.xxx> show virtual-chassis
Virtual Chassis ID: 0026.8868.4080
Mastership Neighbor List
Member ID Status Serial No Model priority Role ID Interface
0 (FPC 0) Prsnt BM0xxxxxxxxx0 ex4200-24t 200 Master* 1 vcp-0
1 (FPC 1) Prsnt BM0xxxxxxxxx2 ex4200-24t 200 Backup 0 vcp-1
r...@crs1.xxx> show virtual-chassis
r...@crs1.xxx> show route 10.10.134.0
inet.0: 20 destinations, 21 routes (20 active, 0 holddown, 0 hidden)
Restart Complete
+ = Active Route, - = Last Active, * = Both
10.10.134.0/24 *[BGP/170] 00:20:46, localpref 100, from 10.10.135.47
AS path: I
to 10.10.135.58 via ge-1/0/23.0
to 10.10.135.62 via ge-0/0/23.0
r...@crs1.xxx> show bgp summary
Groups: 2 Peers: 3 Down peers: 0
Table Tot Paths Act Paths Suppressed History Damp State Pending
inet.0 4 4 0 0 0 0
Peer AS InPkt OutPkt OutQ Flaps Last Up/Dwn
State|#Active/Received/Accepted/Damped...
10.10.135.13 11XXX 27 29 0 0 10:53
1/1/1/0 0/0/0/0
10.10.135.14 11XXX 26 29 0 0 10:47
1/1/1/0 0/0/0/0
10.10.135.47 11XXX 28 28 0 0 10:56
2/2/2/0 0/0/0/0
r...@crs1.xxx> ping 10.10.134.1
PING 10.10.134.1 (10.10.134.1): 56 data bytes
64 bytes from 10.10.134.1: icmp_seq=0 ttl=64 time=1.324 ms
64 bytes from 10.10.134.1: icmp_seq=1 ttl=64 time=1.570 ms
64 bytes from 10.10.134.1: icmp_seq=2 ttl=64 time=1.285 ms
64 bytes from 10.10.134.1: icmp_seq=3 ttl=64 time=1.297 ms
Here's abnormal operation:
Virtual Chassis ID: 0026.8868.4080
Mastership Neighbor List
Member ID Status Serial No Model priority Role ID Interface
0 (FPC 0) Prsnt BM0xxxxxxxxx0 ex4200-24t 200 Master*
1 (FPC 1) NotPrsnt BM0xxxxxxxxx2 ex4200-24t
r...@crs1.xxx> show bgp summary
Groups: 2 Peers: 3 Down peers: 0
Table Tot Paths Act Paths Suppressed History Damp State Pending
inet.0 4 4 0 0 0 0
Peer AS InPkt OutPkt OutQ Flaps Last Up/Dwn
State|#Active/Received/Accepted/Damped...
10.10.135.13 11XXX 3 5 0 0 8
1/1/1/0 0/0/0/0
10.10.135.14 11XXX 2 5 0 0 2
1/1/1/0 0/0/0/0
10.10.135.47 11XXX 4 3 0 0 11
2/2/2/0 0/0/0/0
r...@crs1.xxx> show route 10.10.134.0
inet.0: 14 destinations, 15 routes (14 active, 0 holddown, 0 hidden)
Restart Complete
+ = Active Route, - = Last Active, * = Both
10.10.134.0/24 *[BGP/170] 00:03:35, localpref 100, from 10.10.135.47
AS path: I
to 10.10.135.62 via ge-0/0/23.0
{master:0}
r...@crs1.xxx> ping 10.10.134.1
PING 10.10.134.1 (10.10.134.1): 56 data bytes
ping: sendto: No route to host
ping: sendto: No route to host
ping: sendto: No route to host
ping: sendto: No route to host
ping: sendto: No route to host
ping: sendto: No route to host
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