To configure an IPv6 address and default route:
ACLS for IPV6:
First, the rules for implicit deny are different than with IPv4. The implicit rule for IPv6 includes provisions for allowing neighbor-discovery advertisement and solicitation messages to be allowed through the ACL to ensure Path MTU-related discovery can complete properly, as it is different than Path MTU in IPv4.
This is what the IPv6 implicit rule looks like, explicitly configured:
permit icmp any any nd-na
permit icmp any any nd-ns
deny ipv6 any any
… Any explicit deny at the end of an ACL will break Path MTU, so be careful and configure accordingly.
Here is an example of and IPv6 ACL:
Note that traffic-filter is used instead of access-group in IPv6.
To apply the ACL to a VTY in IPv6:
ipv6 access-class <ACL name>
Note: ACLs are either named or extended in IPv6.