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 [[email protected]] on behalf of Brett .
[[email protected]]
Sent: 15 September 2015 14:18
To: [email protected]
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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