Recall that EIGRP maintains separate tables for IPv4 and IPv6; therefore, an IPv6 default route must be propagated separately, as shown in Figure 1. Similar to EIGRP for IPv4, a default static route is configured on the gateway router (R2), as shown in Figure 2:
R2(config)# ipv6 route ::/0 serial 0/1/0
The ::/0 prefix and prefix-length is equivalent to the 0.0.0.0 0.0.0.0 address and subnet mask used in IPv4. Both are all-zero addresses with a /0 prefix-length.
The IPv6 default static route is redistributed into the EIGRP for IPv6 domain using the same redistribute static command used in EIGRP for IPv4.
Note: Some IOSs may require that the redistribute static command include the EIGRP metric parameters before the static route can be redistributed.
Verifying Propagation of Default Route
The propagation of the IPv6 static default route can be verified by examining R1’s IPv6 routing table using the show ipv6 route command, as shown in Figure 3. Notice that the successor or next-hop address is not R2, but R3. This is because R3 provides a better path to R2, at a lower cost metric than R1.