Hey group,
I am in the middle of Lab #30 from the CCIE Lab Study Guide which involves
OSPF virtual links. Here's my configs:
R2503 - backbone router
hostname r2503
!
!
ip subnet-zero
!
!
!
interface Loopback0
ip address 1.1.1.1 255.255.255.0
no ip directed-broadcast
!
interface Ethernet0
no ip address
no ip directed-broadcast
shutdown
!
interface Serial0
ip address 192.1.1.1 255.255.255.0
no ip directed-broadcast
ip ospf interface-retry 0
no ip mroute-cache
no fair-queue
!
interface Serial1
no ip address
no ip directed-broadcast
shutdown
!
interface BRI0
no ip address
no ip directed-broadcast
shutdown
!
router ospf 100
network 192.1.1.1 0.0.0.0 area 0
!
ip classless
!
!
!
line con 0
transport input none
line aux 0
line vty 0 4
!
end
--------------------------------------------------
R2523- backbone router, link between R2503 & R4000
hostname r2523
!
!
ip subnet-zero
!
!
!
interface Loopback0
ip address 2.2.2.2 255.255.255.0
no ip directed-broadcast
!
interface Serial0
ip address 193.1.1.2 255.255.255.0
no ip directed-broadcast
ip ospf interface-retry 0
no ip mroute-cache
no fair-queue
!
interface Serial1
ip address 192.1.1.2 255.255.255.0
no ip directed-broadcast
ip ospf interface-retry 0
clockrate 64000
!
interface Serial2
no ip address
no ip directed-broadcast
shutdown
!
interface Serial3
no ip address
no ip directed-broadcast
shutdown
!
interface Serial4
no ip address
no ip directed-broadcast
shutdown
!
interface Serial5
no ip address
no ip directed-broadcast
shutdown
!
interface Serial6
no ip address
no ip directed-broadcast
shutdown
!
interface Serial7
no ip address
no ip directed-broadcast
shutdown
!
interface Serial8
no ip address
no ip directed-broadcast
shutdown
!
interface Serial9
no ip address
no ip directed-broadcast
shutdown
!
interface TokenRing0
no ip address
no ip directed-broadcast
shutdown
!
interface BRI0
no ip address
no ip directed-broadcast
shutdown
!
router ospf 100
area 1 virtual-link 3.3.3.3
network 192.1.1.2 0.0.0.0 area 0
network 193.1.1.2 0.0.0.0 area 1
!
ip classless
!
!
!
line con 0
transport input none
line aux 0
line vty 0 4
!
end
-----------------------------------------
R4000, in areas 1 & 4, has a virtual link through R2523
hostname r4000
!
!
!
!
interface Loopback0
ip address 3.3.3.3 255.255.255.0
!
interface Ethernet0
ip address 152.1.1.1 255.255.255.0
no keepalive
media-type 10BaseT
!
interface Serial0
ip address 193.1.1.1 255.255.255.0
no ip mroute-cache
no fair-queue
clockrate 64000
!
interface Serial1
no ip address
shutdown
!
interface TokenRing0
no ip address
shutdown
!
router ospf 100
network 152.1.1.1 0.0.0.0 area 4
network 193.1.1.1 0.0.0.0 area 1
area 1 virtual-link 2.2.2.2
!
ip classless
!
!
!
line con 0
line aux 0
line vty 0 4
login
!
end
-------------------------------------
the virtual link seems to be working fine. Here's a paste of
show ip ospf virtual-link from r2523
r2523#show ip ospf vir
Virtual Link OSPF_VL0 to router 3.3.3.3 is up
Run as demand circuit
DoNotAge LSA allowed.
Transit area 1, via interface Serial0, Cost of using 64
Transmit Delay is 1 sec, State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:01
Adjacency State FULL (Hello suppressed)
Here's a paste of show ip ospf virtual-link from r4000
r4000#show ip ospf vir
Virtual Link OSPF_VL0 to router 2.2.2.2 is up
Run as demand circuit
DoNotAge LSA allowed.
Transit area 1, via interface Serial0, Cost of using 64
Transmit Delay is 1 sec, State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:03
Adjacency State FULL (Hello suppressed)
Here's the problem. I cannot ping r4000's ethernet interface (which is in
area 4) from r2503. the network statement for 152.1.1.0/24 is in r2503's
route table, but not in r2523's route table.
r2503#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate
default
U - per-user static route, o - ODR
Gateway of last resort is not set
1.0.0.0/24 is subnetted, 1 subnets
C 1.1.1.0 is directly connected, Loopback0
152.1.0.0/24 is subnetted, 1 subnets
O IA 152.1.1.0 [110/138] via 192.1.1.2, 00:17:22, Serial0
O IA 193.1.1.0/24 [110/128] via 192.1.1.2, 00:17:22, Serial0
C 192.1.1.0/24 is directly connected, Serial0
r2523#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate
default
U - per-user static route, o - ODR
Gateway of last resort is not set
2.0.0.0/24 is subnetted, 1 subnets
C 2.2.2.0 is directly connected, Loopback0
C 193.1.1.0/24 is directly connected, Serial0
C 192.1.1.0/24 is directly connected, Serial1
When I try to ping 152.1.1.1 from r2503, I get U.U.U. This makes total sense
because r2523 does not have a route for it in its table, but the question
is: Why doesn't r2523 have a route for 152.1.1.0/24 in its table?
If someone can spot a mistake in my config, or even give me an idea, please
feel free. :)
Fred
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