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

[Adam Vitkovsky]

Where did you enable MPLS please, only in the core or on the edges as well?
In other words are some ingress PEs and egress PEs running MPLS VPNs or just pure IP?

If only subset of core routers are running MPLS (allocates labels for NHs resulting in single label in the stack)  then this should work.
Just make sure the Vl2004 is not enabled for MPLS (expecting NH label) which I guess is true when the locally originated traffic is not affected.

It appears as yet another HW programming issue with ME that no one stumbled across, cause to be fair these days it's all or nothing with regards to enabling MPLS in the core (greenfield deployments avoiding running into weired shituations).

adam


        Adam Vitkovsky
        IP Engineer

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________________________________________
From: cisco-nsp [cisco-nsp-bounces at puck.nether.net] on behalf of Brett . [brett8192 at hotmail.com]
Sent: 15 September 2015 14:18
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] Cisco ME3600X MPLS OSPF balanced LSP, non LSP drop packets

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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