Guys,
I found an issue when configuring OSPF via the interface as opposed to using
the network command. Can someone explain why this happened and how we should
know when to use the "interface OSPF config" vs. the "network cmd OSPF config"?
Summary: When using the interface OSPF cmd, the OE2 route did not show up on
R5, it showed as an IA route. When I changed my advertisting of R9's connected
networks (netw 172.16.69.0 0.0.0.255 area 9), it showed up as an OSPF OE2 route
on R6 and R5.
Here was the test:
//Went through the task, configured my route map, redistributing Loopback 0
into OSPF (At this point, I am using "ip ospf 1 area 9" on S0/2/0 & lo0)
R9(config-if)#do sh run | s ospf|inter
interface Loopback0
ip address 192.168.9.9 255.255.255.255
ip ospf 1 area 9
interface FastEthernet0/0
ip address 172.16.90.9 255.255.255.240
ip ospf 1 area 9
duplex auto
speed auto
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
interface Serial0/2/0
ip address 172.16.69.2 255.255.255.252
encapsulation ppp
ip ospf 1 area 9
no fair-queue
ppp authentication chap
ppp chap password 7 030D4B0E1E1F245E5A
interface Serial0/2/1
no ip address
shutdown
router ospf 1
router-id 192.168.9.9
log-adjacency-changes
redistribute connected subnets route-map RedistL0
match interface Loopback0
R9(config-if)#do sh ip ospf nei
Neighbor ID Pri State Dead Time Address Interface
192.168.6.6 0 FULL/ - 00:00:36 172.16.69.1 Serial0/2/0
R5(config-router)#do sh ip ro os
192.168.9.0/32 is subnetted, 1 subnets
O IA 192.168.9.9 [110/66] via 172.16.200.6, 00:00:03, FastEthernet0/0
//shows up as an IA route
172.16.0.0/16 is variably subnetted, 5 subnets, 5 masks
O IA 172.16.90.0/28 [110/66] via 172.16.200.6, 00:00:03, FastEthernet0/0
O IA 172.16.69.0/30 [110/65] via 172.16.200.6, 00:00:03, FastEthernet0/0
192.168.6.0/32 is subnetted, 1 subnets
O IA 192.168.6.6 [110/2] via 172.16.200.6, 00:12:25, FastEthernet0/0
192.168.7.0/32 is subnetted, 1 subnets
O 192.168.7.7 [110/2] via 172.16.200.7, 00:12:45, FastEthernet0/0
192.168.2.0/32 is subnetted, 1 subnets
O IA 192.168.2.2 [110/65] via 172.16.0.2, 00:11:55, Serial0/1/0
R6(config-router)#do sh ip ro os
192.168.9.0/32 is subnetted, 1 subnets
O 192.168.9.9 [110/65] via 172.16.69.2, 00:02:06, Serial0/2/0
//R6 shows it as an internal route
172.16.0.0/16 is variably subnetted, 6 subnets, 6 masks
O 172.16.25.0/24 [110/65] via 172.16.200.5, 00:14:32, FastEthernet0/0
O 172.16.90.0/28 [110/65] via 172.16.69.2, 00:02:06, Serial0/2/0
192.168.5.0/32 is subnetted, 1 subnets
O IA 192.168.5.5 [110/2] via 172.16.200.5, 00:14:32, FastEthernet0/0
192.168.7.0/32 is subnetted, 1 subnets
O 192.168.7.7 [110/2] via 172.16.200.7, 00:14:32, FastEthernet0/0
192.168.2.0/32 is subnetted, 1 subnets
O IA 192.168.2.2 [110/65] via 172.16.0.2, 00:14:02, Serial0/1/0
//Changed my config as it is presented in the DSG
R9(config-if)#int lo0
R9(config-if)#no ip ospf 1 area 9
R9(config-if)#int s0/2/0
R9(config-if)#no ip ospf 1 area 9
R9(config-if)#
*Jun 26 07:52:18.991: %OSPF-5-ADJCHG: Process 1, Nbr 192.168.6.6 on Serial0/2/0
from FULL to DOWN, Neighbor Down: Interface down or detached
R9(config-if)#router ospf 1
R9(config-router)#netw 172.16.69.0 0.0.0.255 area 9
*Jun 26 07:52:34.575: %OSPF-5-ADJCHG: Process 1, Nbr 192.168.6.6 on Serial0/2/0
from LOADING to FULL, Loading Done
R9(config-router)#netw 172.16.90.0 0.0.0.255 area 9
R9(config-router)#do sh ip ospf nei
//Showing my adjacency after the change
Neighbor ID Pri State Dead Time Address Interface
192.168.6.6 0 FULL/ - 00:00:33 172.16.69.1 Serial0/2/0
//Now R6 shows R9's Lo0 as an E2 route
R6(config-router)#do sh ip ro os
192.168.9.0/32 is subnetted, 1 subnets
O E2 192.168.9.9 [110/20] via 172.16.69.2, 00:00:52, Serial0/2/0
//Now R6 & R5 show the route to R9's loopback as OE2 & redistributed
172.16.0.0/16 is variably subnetted, 6 subnets, 6 masks
O 172.16.25.0/24 [110/65] via 172.16.200.5, 00:16:08, FastEthernet0/0
O 172.16.90.0/28 [110/65] via 172.16.69.2, 00:03:42, Serial0/2/0
192.168.5.0/32 is subnetted, 1 subnets
O IA 192.168.5.5 [110/2] via 172.16.200.5, 00:16:08, FastEthernet0/0
192.168.7.0/32 is subnetted, 1 subnets
O 192.168.7.7 [110/2] via 172.16.200.7, 00:16:08, FastEthernet0/0
192.168.2.0/32 is subnetted, 1 subnets
O IA 192.168.2.2 [110/65] via 172.16.0.2, 00:15:38, Serial0/1/0
//Therefore, R5 shows it as an E2 route as well
R5(config-router)#do sh ip ro os
192.168.9.0/32 is subnetted, 1 subnets
O E2 192.168.9.9 [110/20] via 172.16.200.6, 00:01:35, FastEthernet0/0
//Now R6 & R5 show the route to R9's loopback as OE2 & redistributed
172.16.0.0/16 is variably subnetted, 5 subnets, 5 masks
O IA 172.16.90.0/28 [110/66] via 172.16.200.6, 00:04:24, FastEthernet0/0
O IA 172.16.69.0/30 [110/65] via 172.16.200.6, 00:04:24, FastEthernet0/0
192.168.6.0/32 is subnetted, 1 subnets
O IA 192.168.6.6 [110/2] via 172.16.200.6, 00:16:46, FastEthernet0/0
192.168.7.0/32 is subnetted, 1 subnets
O 192.168.7.7 [110/2] via 172.16.200.7, 00:17:06, FastEthernet0/0
192.168.2.0/32 is subnetted, 1 subnets
O IA 192.168.2.2 [110/65] via 172.16.0.2, 00:16:16, Serial0/1/0
Thank you,
Chris
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______________________________
Christopher Lemish, CCNP/ MCSE
Network Engineer
Blackbox Network Services
Long Island Voice
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Amityville, NY 11701
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