04-04-2007 06:56 PM - edited 03-05-2019 03:18 PM
I am trying to recreate a config I had at a previous employer (which I lost my docs for).
I want a simple ospf config with only redistributing connected and static subnets on core routers and switches. Below is what I have now, but I am having issues getting the loopbacks to talk to each other.
R1
interface Loopback0
ip address 123.234.40.1 255.255.255.255
router ospf 10
router-id 123.234.40.1
log-adjacency-changes
redistribute connected subnets
redistribute static subnets
R2
interface Loopback0
ip address 123.234.40.2 255.255.255.255
router ospf 10
router-id 123.234.40.2
log-adjacency-changes
redistribute connected subnets
redistribute static subnets
It doesn't appear that the loopback0 addresses can see each other.
I have tried adding the following and it didn't work either. The routers are connected via fa1/0 on each router which has subinterfaces which seem to see each other fine over their vlans.
network 123.234.40.0 0.0.0.255 area 0
network 123.234.41.0 0.0.0.255 area 0
network 123.234.42.0 0.0.0.255 area 0
I know I am missing something simple here.. maybe it is just old age kicking in.
Thanks
04-04-2007 07:14 PM
hi there,
what is the ip address on the f1/0 interfaces ?
Cheers
04-04-2007 07:29 PM
R1
fa1/0.100
123.234.41.1 255.255.255.0
fa1/0.300
123.234.42.1 255.255.255.0
R2
fa1/0.100
123.234.41.2 255.255.255.0
fa1/0.300
123.234.42.2 255.255.255.0
Thanks
04-04-2007 07:42 PM
and Can you please paste the show ip ospf neig details
And if possible Could you please paste the running config on R1 and R2
Cheers
04-04-2007 08:01 PM
CR001#sh ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
123.234.40.2 1 FULL/DR 00:00:35 123.234.42.2 FastEthernet1/0.300
123.234.40.2 1 FULL/DR 00:00:35 123.234.41.2 FastEthernet1/0.100
**********************************************
CR002#sh ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
123.234.40.1 1 2WAY/DROTHER 00:00:38 123.234.42.1 FastEthernet1/0.300
123.234.40.1 1 2WAY/DROTHER 00:00:38 123.234.41.1 FastEthernet1/0.100
04-04-2007 08:10 PM
I updated it to show these and it works, not sure why it didn't last time. I have done it before without specifying all the networks and let it discover the connected and static and it worked better without additional tuning.
router ospf 10
router-id 123.234.40.1
log-adjacency-changes
redistribute connected subnets
redistribute static subnets
network 10.40.0.0 0.0.255.255 area 1
network 123.234.40.0 0.0.0.255 area 0
network 123.234.41.0 0.0.0.255 area 0
network 123.234.42.0 0.0.0.255 area 0
As a test on R2 I shut down its internal interfaces and it is not reachable now. So the config is missing the outside network info which is causing it not to route.
My main reason for using it on the router is if an internal interface craps out killing all the vlans, VRRP will take over for the inside, but the R1 router will not know how to get to the internal VRRP interface on R2.
Should I rethink my design? There are 2x 3640 at the border with distribution switches (L3)behind them and switches (L2) connected to the servers and to both distribution switches.
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