[c-nsp] Multipath broken on ASR1k

[Marco Marzetti]

Hello,

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

We redistribute the address 192.0.2.4 on both the upstream routers of 
the box named BG-ASR1.


BG-ASR1#show ip route 192.0.2.4
Routing entry for 192.0.2.4/32
   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 212.183.160.94 on GigabitEthernet0/1/4, 00:11:25 ago
   Routing Descriptor Blocks:
   * 212.183.160.126, from 212.183.160.52, 00:11:38 ago, via 
GigabitEthernet0/1/3
       Route metric is 20, traffic share count is 1
     212.183.160.94, from 212.183.160.50, 00:11:25 ago, via 
GigabitEthernet0/1/4
       Route metric is 20, traffic share count is 1


As you can see they're both active in RIB


BG-ASR1#show ip cef 192.0.2.4 detail
192.0.2.4/32, epoch 5, per-longest-match-prefix sharing
   local label info: global/2398
   nexthop 212.183.160.94 GigabitEthernet0/1/4 label explicit-null
   nexthop 212.183.160.126 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 192.0.2.4 detail
Local      Outgoing   Prefix           Bytes Label   Outgoing   Next Hop
Label      Label      or Tunnel Id     Switched      interface
2398       explicit-n 192.0.2.4/32     0             Gi0/1/3 
212.183.160.126
	MAC/Encaps=14/18, MRU=9192, Label Stack{}
	C47D4FB09F804C4E351A3E938847 00000000
	No output feature configured


Why?
Do You have any ideas?

Thank You