[c-nsp] Cisco ME3600X MPLS OSPF balanced LSP, non LSP drop packets

Brett . brett8192 at hotmail.com
Tue Sep 15 09:18:26 EDT 2015


My network has deployed mpls on ciscos on a trial basis on only a small subsection of our network.

I have a cisco tac case opened for the situation where Cisco ME3600X has balanced path and is dropping traffic.
- in the balanced path One path is a label switched path and the other is non label switched.

Traffic is dropped by the ME3600X when trying to push a packet it received with a label out the non label switched path. 

It only impacts traffic it receives traffic with a label, it does not impact traffic the router generates.

this impacts all the IOSs available for the ME3600X.

ME3600X-2#sho ip route 5.5.5.5
Routing entry for 5.5.5.5/32
  Known via "ospf 100", distance 110, metric 20
  Tag 66000, type extern 2, forward metric 11
  Last update from 10.200.3.3 on Vlan2003, 2d15h ago
  Routing Descriptor Blocks:
  * 10.200.4.4, from 5.5.5.5, 1w6d ago, via Vlan2004
      Route metric is 20, traffic share count is 1
      Route tag 66000
    10.200.3.3, from 5.5.5.5, 2d15h ago, via Vlan2003
      Route metric is 20, traffic share count is 1
      Route tag 66000

ME3600X-2#show mpls forwarding-table 5.5.5.5
Local      Outgoing   Prefix           Bytes Label   Outgoing   Next Hop
Label      Label      or Tunnel Id     Switched      interface
21         20         5.5.5.5/32       0             Vl2003     10.200.3.3
           No Label   5.5.5.5/32       0             Vl2004     10.200.4.4 << traffic would be dropped when this path chosen

 		 	   		  


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