[c-nsp] Multipath broken on ASR1k

Marco Marzetti marco at lamehost.it
Tue Dec 16 11:57:09 EST 2014


I'm afraid that multipath is broken on our ASR1k routers

We redistribute the address on both the upstream routers of 
the box named BG-ASR1.

BG-ASR1#show ip route
Routing entry for
   Known via "ospf 1", distance 110, metric 20, type extern 2, forward 
metric 10
   Redistributing via bgp 41497
   Advertised by bgp 41497 match external 2
   Last update from on GigabitEthernet0/1/4, 00:11:25 ago
   Routing Descriptor Blocks:
   *, from, 00:11:38 ago, via 
       Route metric is 20, traffic share count is 1, from, 00:11:25 ago, via 
       Route metric is 20, traffic share count is 1

As you can see they're both active in RIB

BG-ASR1#show ip cef detail, epoch 5, per-longest-match-prefix sharing
   local label info: global/2398
   nexthop GigabitEthernet0/1/4 label explicit-null
   nexthop GigabitEthernet0/1/3 label explicit-null

And, according to the output above, the corresponding entries are 
present in FIB.

Anyway there is only one entry in mpls forwarding-table.

BG-ASR1#show mpls forwarding-table detail
Local      Outgoing   Prefix           Bytes Label   Outgoing   Next Hop
Label      Label      or Tunnel Id     Switched      interface
2398       explicit-n     0             Gi0/1/3
	MAC/Encaps=14/18, MRU=9192, Label Stack{}
	C47D4FB09F804C4E351A3E938847 00000000
	No output feature configured

Do You have any ideas?

Thank You

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