IPv6 Shortcut Restrictions and Considerations

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.

    

    Note

    This restriction does not apply to VSP 4450 Series switches.

  • 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.