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Cisco Bug: CSCtd03798 - 7300 PXF corrupting IP header checksum during Egress QoS

Last Modified

Feb 22, 2014

Products (1)

  • Cisco 7300 Series Routers

Known Affected Releases

12.2(31)SB6

Description (partial)

Symptoms: In an MPLS VPN, when a Cisco 7300 series router is being used as a
  PE, some prefixes lose reachability. The packet capture between PE and CE shows
  that the header checksum is incorrect:
   
  Protocol: ICMP (0x01)
  Header checksum: 0x93a8 (should be 0x9308)
   
Conditions: The symptom is observed under the following conditions: 
  
  - An MPLS VPN where a Cisco 7300 series router is being used as PE with NSE-100.
  - Both ingress and egress interfaces must be link ethernet interface
  (SPA/PA gigE or FE).
  - Egress interface towards CE must contain QoS marking and it should be a dot1q
  interface.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
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