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Cisco Bug: CSCvs63467 - IPv6 dual stack does not work on Cisco 9800

Last Modified

Aug 29, 2020

Products (6)

  • Cisco Catalyst 9800 Series Wireless Controllers
  • Cisco Catalyst 9800-40 Wireless Controller
  • Cisco Catalyst 9800-L-C Wireless Controller
  • Cisco Catalyst 9800-L-F Wireless Controller
  • Cisco Catalyst 9800-80 Wireless Controller
  • Cisco Catalyst 9800-CL Wireless Controller for Cloud

Known Affected Releases

16.11.2 16.12.1s

Description (partial)

Dual stack clients unable to reach any IPv6 destination till they ping ipv6 gateway.

1)	Wireless client tries to ping an IPv6 destination in a different subnet, the next hop is the IPv6 gateway.
2)	Wireless client sends NS to resolve the MAC address of the gateway.
3)	Wireless client gets NA from gateway.
4)	On wireless client, IPv6 ping request can be sent out now (#1229 in the trace.txt).
5)	After IPv6 ping reply arriving at the gateway, to send the IPv6 ping reply to the wireless client, gateway sends out NS to resolve the MAC address of the client (#1327 in the trace.txt).
6)	The NS from gateway is dropped in CPP because the SISF snooping flag is not enabled for the wireless client vlan (vlan 210 in customer case).

The issue is seen when we have the VLAN delete/add as well.
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