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24.10 Routing for IPv6
Routing for IPv6 Section 24: Introducing Basic IPv6 To support IPv6, all the IPv4 routing protocols had to go through varying degrees of changes, with the most obvious being that each had to be changed to support longer addresses and prefixes. As with IPv4, most IPv6 routing protocols are IGPs, with BGP still being the only EGP of note. All these IGPs and BGP were updated to support IPv6. The table lists the routing protocols and their new RFCs. IPv6 Routing Protocols and their RFCs Routing Protocol Full Name RFC RIPng RIP next generation 2080 OSPFv3 OSPF version 3 2740 MPBGP4 Multiprotocol BGP4 2545/4760 EIGRP for IPv6 EIGRP for IPv6 Proprietary Each of these routing protocols has to make several changes to support IPv6. The actual messages used to send and receive routing information have changed, using IPv6 headers instead of IPv4 headers and using IPv6 addresses in those headers. For example, RIPng sends routing updates to the IPv6 destination address FF02::9, instead of to the former RIPv2 IPv4 184.108.40.206 address. Also, the routing protocols typically advertise their linklocal IP address as the next hop in a route. The routing protocols still retain many of the same internal features. For example, RIPng, based on RIPv2, is still a distance vector protocol, with hop count as the metric and 15 hops as the longest valid route (16 is infinity). OSPFv3, created specifically to support IPv6, is still a linkstate protocol, with cost as the metric but with many of the internals, including LSA types, changed. As a result, OSPFv2 is not compatible with OSPFv3. However, the core operational concepts remain the same. Up Next: Configuring IPv6