IS-IS IPv6 TLVs for IPv6 routing is supported in 7210 SAS. This is considered native IPv6 routing with IS-IS. It has a limitation that IPv4 and IPv6 topologies must be congruent, otherwise traffic may be blackholed. Service providers should ensure that the IPv4 topology and IPv6 topology are the same. With the IS-IS multi-topology service providers can use different topologies for IPv4 and IPv6.
The implementation is compliant with draft-ietf-isis-wg-multi-topology-xx.txt, M-ISIS: Multi Topology (MT) Routing in IS-IS.
The following MT topologies are supported:
MT ID #0 - equivalent to the standard IS-IS topology
MT ID #2 - reserved for IPv6 routing topology