IOS XE 15.5
IOS XR 5.3
The topology for this demo:
This post will focus on OSPFv2 and OSPFv3 in the context of VRF Lite. Both IOS and IOS XR both fully support IPv4 and IPv6 VRF aware routing for OSPF.
One caveat, IOS XR does not support the IPv6 AFI under the ospf router context, unlike IOS, which supports IPv4 and IPv6 under OSPFv3. IOS XR requires IPv4 under the OSPFv2 AFI and IPv6 under the OSPFv3 AFI.
R1
router ospf 2 vrf CCIE
network 0.0.0.0 255.255.255.255 area 0
!
interface GigabitEthernet1.100
ospfv3 2 ipv6 area 0
!
interface GigabitEthernet1.100
ospfv3 2 ipv6 area 0
XR5
router ospf 2
vrf CCIE
area 0
interface Loopback100
!
interface GigabitEthernet0/0/0/0.100
!
interface GigabitEthernet0/0/0/0.101
!
router ospfv3 2
vrf CCIE
area 0
interface Loopback100
!
interface GigabitEthernet0/0/0/0.100
!
interface GigabitEthernet0/0/0/0.101
R4
router ospf 2 vrf CCIE
network 0.0.0.0 255.255.255.255 area 0
!
interface GigabitEthernet1.101
ospfv3 2 ipv6 area 0
interface GigabitEthernet1.102
ospfv3 2 ipv6 area 0
!
interface Loopback100
ospfv3 2 ipv6 area 0
R3
router ospf 2 vrf CCIE
network 0.0.0.0 255.255.255.255 area 0
!
interface Loopback100
ospfv3 2 ipv6 area 0
!
interface GigabitEthernet1.102
ospfv3 2 ipv6 area 0
RP/0/0/CPU0:XR5#sh ospf vrf CCIE neighbor
Tue Jan 3 22:06:31.330 UTC
* Indicates MADJ interface
Neighbors for OSPF 2, VRF CCIE
Neighbor ID Pri State Dead Time Address Interface
100.100.100.1 1 FULL/DR 00:00:31 192.168.15.1 GigabitEthernet0/0/0/0.100
Neighbor is up for 00:11:54
100.100.100.4 1 FULL/BDR 00:00:34 192.168.45.4 GigabitEthernet0/0/0/0.101
Neighbor is up for 00:11:16
Total neighbor count: 2
RP/0/0/CPU0:XR5#sh ospfv3 vrf CCIE neighbor
Tue Jan 3 22:06:51.949 UTC
Neighbors for OSPFv3 2, VRF CCIE
Neighbor ID Pri State Dead Time Interface ID Interface
100.100.100.4 1 FULL/BDR 00:00:38 15 GigabitEthernet0/0/0/0.101
Neighbor is up for 00:11:25
100.100.100.1 1 FULL/DR 00:00:34 30 GigabitEthernet0/0/0/0.100
Neighbor is up for 00:12:14
Total neighbor count: 2
The outputs above are specific to the IPv4 and IPv6 VRF aware processes, you can see there are 2 neighbors per AFI.
R4#sh ospf 2 vrf CCIE neighbor
OSPFv3 2 address-family ipv6 vrf CCIE (router-id 100.100.100.4)
Neighbor ID Pri State Dead Time Interface ID Interface
100.100.100.3 1 FULL/BDR 00:00:32 18 GigabitEthernet1.102
192.168.1.15 1 FULL/DR 00:00:38 15 GigabitEthernet1.101
R4#sh ip ospf 2 neighbor
Neighbor ID Pri State Dead Time Address Interface
100.100.100.3 1 FULL/BDR 00:00:37 192.168.34.3 GigabitEthernet1.102
192.168.1.15 1 FULL/DR 00:00:33 192.168.45.15 GigabitEthernet1.101
You should take notice to something, with IPv6, you can specify the VRF to pull the correct information. You do not specify the VRF with IPv4, you specify the OSPF process ID.
R1#sh ip route vrf CCIE ospf | b Gateway
Gateway of last resort is not set
100.0.0.0/32 is subnetted, 4 subnets
O 100.100.100.3
[110/4] via 192.168.15.15, 00:11:04, GigabitEthernet1.100
O 100.100.100.4
[110/3] via 192.168.15.15, 00:12:44, GigabitEthernet1.100
O 100.100.100.15
[110/2] via 192.168.15.15, 00:14:07, GigabitEthernet1.100
O 192.168.34.0/24
[110/3] via 192.168.15.15, 00:12:44, GigabitEthernet1.100
O 192.168.45.0/24
[110/2] via 192.168.15.15, 00:14:07, GigabitEthernet1.100
R1#sh ipv6 route vrf CCIE ospf
IPv6 Routing Table - CCIE - 9 entries
O 2100:34::/64 [110/3]
via FE80::20C:29FF:FEB7:44DF, GigabitEthernet1.100
O 2100:45::/64 [110/2]
via FE80::20C:29FF:FEB7:44DF, GigabitEthernet1.100
O FC00::3/128 [110/3]
via FE80::20C:29FF:FEB7:44DF, GigabitEthernet1.100
O FC00::4/128 [110/2]
via FE80::20C:29FF:FEB7:44DF, GigabitEthernet1.100
O FC00::15/128 [110/1]
via FE80::20C:29FF:FEB7:44DF, GigabitEthernet1.100
The outputs above prove that we are connected via IPv4 and IPv6.
Thanks for stopping by!
Rob Riker, CCIE #50693
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