TOI Author :: Srinivasan Viswanathan

The document describes an extension of the decap group feature, that allows IPv6 addresses to be configured and used as part of a group. IP-in-IP packets with v6 destination matching a configured decap group IP will be decapsulated and forwarded based on the inner header. That will allow any IP-to-IP packet type to be decapsulated, i.e. IPv4 in IPv4, IPv4 in IPv6, IPv6 in IPv4 and IPv6 in IPv6.

With this feature, Arista 7050 and 7050X series of switches can now decapsulate IP in IP tunneled packets. When IP in IP decapsulation is configured, incoming packets with an outer IP header having IpProto=4 (IP in IP) and IpDest matching the one configured will be decapsulated, meaning that the outer IP header will be removed from the packet and all subsequent forwarding decisions will be based on the inner IP header.

With this feature, IPv4 or IPv6 packets matching a static nexthop-group route can be encapsulated within an IP-in-IP tunnel and forwarded

Compatible platforms start up in the “default” forwarding-table partition mode, which provides the ability to program up to 8K L2 addresses.