CISC-RT-000236 - The Cisco switch must be configured to advertise a hop limit of at least 32 in Switch Advertisement messages for IPv6 stateless auto-configuration deployments.
The Neighbor Discovery protocol allows a hop limit value to be advertised by routers in a Router Advertisement message being used by hosts instead of the standardized default value. If a very small value was configured and advertised to hosts on the LAN segment, communications would fail due to the hop limit reaching zero before the packets sent by a host reached its destination. NOTE: Nessus has not performed this check. Please review the benchmark to ensure target compliance.
Configure the switch to advertise a hop limit of at least 32 in Router Advertisement messages as shown in the example. SW1(config)# interface e2/1 - 2 SW1(config-if-range)# ipv6 nd hop-limit 32 SW1(config-if-range)# end