Specifying an IPv6 Hop Count Limit

You can specify the maximum number of hops that the router can use in router advertisements and all IPv6 packets.

ipv6 hop-limit

Use to set the maximum number of hops that the router can use in router advertisements and all IPv6 packets.
Examplehost1(config)#ipv6 hop-limit 50
Use the no version to set the hop limit for IPv6 packets to 255 hops and router advertisements to zero (0) hops (or “ unspecified” ).
See ipv6 hop-limit