3.6.c Implement and troubleshoot OSPFv3 address-family support

3.6.c [i] IPv4 address-family

eigrp, like its big brother bgp plays well with address families…

PE2(config-router-af)#do sh run | b eigrp
router eigrp 2
no auto-summary
address-family ipv4 vrf arc
no auto-summary
autonomous-system 2

ospf however, requires a different method to be placed in a vrf:

router ospf 3 vrf toy
network area 0

why? because address families didn’t get support until ospfv3…

according to rfc 5838: http://tools.ietf.org/html/rfc5838

Support of Address Families in OSPFv3


   This document describes a mechanism for supporting multiple address
   families (AFs) in OSPFv3 using multiple instances.  It maps an AF to
   an OSPFv3 instance using the Instance ID field in the OSPFv3 packet
   header.  This approach is fairly simple and minimizes extensions to
   OSPFv3 for supporting multiple AFs.