For those with a R&S background this will be simple and almost not worth your time but it's the IOS XR configuration that is more important. The below topology is what I will be using for all of the OSPF posts.
On all the IOS devices, R4-R7 on the LAN and Loopack interfaces we'll start with configuring the network statement on the LAN interfaces to the /24 level and the interface configuration on the loopbacks, so you'll see the 2 main ways. There is a third with redistribution calling a route-map that specifies the interfaces.
R4
R4(config-router)#do sh run | sec ospf
router ospf 1
network 10.4.7.0 0.0.0.255 area 0
network 10.4.15.0 0.0.0.255 area 0
network 10.5.4.0 0.0.0.255 area 0
interface Loopback0
ip ospf 1 area 0
R5
R5(config-router)#do sh run | sec ospf
router ospf 1
network 10.5.4.0 0.0.0.255 area 0
network 10.5.6.0 0.0.0.255 area 0
interface Loopback0
ip ospf 1 area 0
R6
R6(config-if)#do sh run | sec ospf
router ospf 1
network 10.5.6.0 0.0.0.255 area 0
network 10.6.7.0 0.0.0.255 area 0
interface Loopback0
ip ospf 1 area 0
R7
R7(config-if)#do sh run | sec ospf
router ospf 1
network 10.4.7.0 0.0.0.255 area 0
network 10.6.7.0 0.0.0.255 area 0
network 10.7.16.0 0.0.0.255 area 0
interface Loopback0
ip ospf 1 area 0
Verification is the 2nd most important part, you can see that we have full adjacency with R4 and R6.
R7(config-if)#do sh ip ospf nei
Neighbor ID Pri State Dead Time Address Interface
4.4.4.4 1 FULL/DR 00:00:35 10.4.7.4 GigabitEthernet1.47
6.6.6.6 1 FULL/DR 00:00:36 10.6.7.6 GigabitEthernet1.67
Now it's time for IOS XR, the configuration is very simple, now that I've done it like 50 times it's easy. Slightly different command structure but, at the end of the day you'll see where things jive.
XR5
RP/0/0/CPU0:XR5(config-ospf-ar-if)#do sh run router ospf
Tue Jun 14 23:33:39.549 UTC
router ospf 1
area 0
interface Loopback0
!
interface GigabitEthernet0/0/0/0.415
!
interface GigabitEthernet0/0/0/0.1516
XR6
RP/0/0/CPU0:XR6(config-ospf-ar-if)#do sh run router ospf
Tue Jun 14 23:34:26.836 UTC
router ospf 1
area 0
interface Loopback0
!
interface GigabitEthernet0/0/0/0.716
!
interface GigabitEthernet0/0/0/0.1516
The functional difference is everything is configured globally under the routing process. So when you want to do anything to the protocol, go the appropriate sub feature and configure it. As we get into more configuration depth in later posts you'll see exactly what I mean.
Verification on XR is very similar to IOS
RP/0/0/CPU0:XR6#sh ospf nei
Tue Jun 14 23:36:11.048 UTC
* Indicates MADJ interface
Neighbors for OSPF 1
Neighbor ID Pri State Dead Time Address Interface
7.7.7.7 1 FULL/DR 00:00:36 10.7.16.7 GigabitEthernet0/0/0/0.716
Neighbor is up for 00:01:48
15.15.15.15 1 FULL/DR 00:00:35 10.15.16.15 GigabitEthernet0/0/0/0.1516
Neighbor is up for 00:01:49
RP/0/0/CPU0:XR6#sh ospf interface brief
Tue Jun 14 23:36:30.197 UTC
* Indicates MADJ interface, (P) Indicates fast detect hold down state
Interfaces for OSPF 1
Interface PID Area IP Address/Mask Cost State Nbrs F/C
Lo0 1 0 16.16.16.16/32 1 LOOP 0/0
Gi0/0/0/0.716 1 0 10.7.16.16/24 1 BDR 1/1
Gi0/0/0/0.1516 1 0 10.15.16.16/24 1 BDR 1/1
There you have it. Pretty simple. I won't do a debug dump or wireshark capture at least for this as it's a base config. I will do debug outputs as we get into more interesting configs later so you can see mis-configurations and the "deltas" or differences in case you are here for troubleshooting support.
Thanks for stopping by and stay tuned for more content in the future.
Rob Riker, CCIE #50693, VCP5/6-DCV
No comments:
Post a Comment