8.2 Implementing OSPFv3

CCNP RS 300-101, Configuring OSPFv3, Uncategorized

There are two methods for configuring IPv6 on Cisco routers:

  • Traditional
  • OSPFv3

Method 1: Traditional IPv6 OSPF configuration:

  • Enable IPv6 globally: ipv6 unicast-routing
  • Create a separate routing process for IPv6: ipv6 router ospf <ID>
  • Under interfaces: ipv6 ospf <ID> area <Area#>
  • For NBMA links, per interface: ipv6 ospf neighbor <Link-Local Address>

There are two new LSA types in IPv6 for OSPF:

  • Type 8 (Link LSAs): Advertise the link-local addresses to neighbors and are never flooded beyond the link they are associated with.
  • Type 9 (Intra-Area Prefix LSAs): The link-state IDs describe association to a router or network LSA.

Method 2: OSPFv3 for IPv4 and IPv6

  • Uses address families and can manage both IPv4 and IPv6 OSPF configurations from a single process ID.
  • Upon configuration, can instantiate traditional configurations without incurring outage
  • Enables easy dual-stack configuration
  • Uses some old commands and some new commands for troubleshooting:
    • show ipv6 ospf neighbor
    • show ipv6 ospf database
    • show ospfv3 neighbor
    • show ospfv3 database

Note: OSPFv3 (the new standard) provides the advantage of merging IPv4 and IPv6 into a single database, thereby improving system resource utilization.

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