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Cisco Bug: CSCvv10167 - CSI in-out: IPv4/v6 traffic drop with "MPLS TTL expiration, IP payload/MPLS PLU no match

Last Modified

Aug 21, 2020

Products (1)

  • Cisco Network Convergence System 6000 Series Routers

Known Affected Releases

7.0.1.BASE

Description (partial)

Symptom:
Packets dropped on ingress linecard on NCS6K with "MPLS TTL expiration,IP Payload" count incrementing in "show controllers pse statistics location <>".

Conditions:
The following conditions need to be met to hit the issue:
1. Issue applicable only to NCS6K.
2. Issue applicable only to Collapsed forwarding topology (multi SDR connected using CSI interfaces).
3. This is the only topology with which issue cane be hit: 
    <--------------- Traffic direction
    InfraRI----CSI----InetRI----CSI----SU----TL
4. This is BGP policy applied on INet RI. Without this issue is not reproduced.
    route-policy IN-CUST-V6($PfxList)
    # From customers - also need a prefix-set if they want to send us anything
    if not destination in $PfxList then
    drop
    endif
    set next-hop peer-address
    pass
    end-policy
    !
5. Image should be r701 or above.
6. The dropped packet should be an IPv6 packet with no labels. 

All the above conditions need to be met to hit the issue.
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Bug Details Include

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  • Status
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