The following features are not supported:
Disabling and enabling alternate routes for IPv6 routes
Redistribution of RIP into IS-IS
6-in-4 tunnels are not supported when the tunnel destination IP is reachable via IPv4 Shortcuts route.
Keep the following considerations in mind when configuring IPv6 Shortcuts:
IPv4 Shortcuts must be enabled before enabling IPv6 Shortcuts.
IPv6 Shortcuts support Circuitless IPv6 (CLIPv6) with the following limitations:
Stateless address autoconfiguration (SLAAC) is not supported on IPv6 CLIP interfaces.
IPv6 CLIP does not support link-local address configuration.
To configure an IPv6 address with a prefix length from 65 to 127 on a CLIP interface, you must enable the IPv6 mode flag.
Neighbor discovery (ND) does not run on an IPv6 CLIP interface. Therefore, the system does not detect when you configure a duplicate IPv6 address.
Multiple IPv6 address configuration on an IPv6 CLIP interface is not supported.
You can configure a maximum of 64 IPv6 CLIP interfaces.
IPv6 CLIP interface is enabled by default and it cannot be disabled.
IPv6 with vIST provides the same support as IPv4 with vIST.
To help with debugging, CFM provides full support for both IPv4 and IPv6 addresses for the l2ping and l2traceroute commands.