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Cisco Bug: CSCvt04669 - Packet dropped due to incorrect ether_type

Last Modified

Sep 02, 2020

Products (11)

  • Cisco ASR 9000 Series Aggregation Services Routers
  • Cisco ASR 9910 Router
  • Cisco IOS XR Software
  • Cisco ASR 9922 Router
  • Cisco ASR 9010 Router
  • Cisco ASR 9904 Router
  • Cisco ASR 9006 Router
  • Cisco ASR 9001 Router
  • Cisco ASR 9901 Router
  • Cisco ASR 9912 Router
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Known Affected Releases


Description (partial)

ASR9K sends IPv6 packets with wrong etherytype (IPv4 instead of IPv6)

#1. ASR9K does PHP (penultimate hop popping) for MPLS labelled IPv6 traffic. MPLS pkt is received and IPv6 pkt is sent out.
#2. Link to downstream router (which receives corrupted packets) is TI-LFA protected
#3. The ingress LC is 4th and 5th generation of ASR9000 Ethernet line cards (aka Lightspeed) and the egress LC is 3rd generation of ASR9000 Ethernet line cards (aka Tomahawk).
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