From: Brian Dennis (bdennis@internetworkexpert.com)
Date: Sat Nov 04 2006 - 00:28:49 ART
Here is an example of an OSPF network with only two non-zero areas
working using a virtual-link. The configuration is: R1 <-Ethernet-> R2
<-Serial-> R3. Area 12 is between R1 and R2. Area 13 is between R2 and
R3. There is a virtual-link between R1 and R2 across area 12.
If you try to build this network yourself be sure to create the first
OSPF area then the virtual link before adding on the second OSPF area.
Rack1R1#sho run
Building configuration...
Current configuration : 974 bytes
!
hostname Rack1R1
!
interface Loopback0
ip address 10.1.1.1 255.255.255.255
!
interface FastEthernet0/0
ip address 172.16.1.1 255.255.255.0
!
router ospf 1
area 12 virtual-link 10.2.2.2
network 172.16.1.1 0.0.0.0 area 12
end
Rack1R1#
Rack1R2#show ip ospf nei
Neighbor ID Pri State Dead Time Address
Interface
10.1.1.1 0 FULL/ - - 172.16.1.1
OSPF_VL1
10.1.1.1 1 FULL/BDR 00:00:35 172.16.1.1
FastEthernet0/0
10.3.3.3 0 FULL/ - 00:00:38 172.16.2.3
Serial0/1
Rack1R2#sho ip os vir
Virtual Link OSPF_VL1 to router 10.1.1.1 is up
Run as demand circuit
DoNotAge LSA allowed.
Transit area 12, via interface FastEthernet0/0, Cost of using 1
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)
Index 1/2, retransmission queue length 0, number of retransmission 1
First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
Last retransmission scan length is 1, maximum is 1
Last retransmission scan time is 0 msec, maximum is 0 msec
Rack1R2#
Rack1R2#wr t
Building configuration...
Current configuration : 976 bytes
!
hostname Rack1R2
!
interface Loopback0
ip address 10.2.2.2 255.255.255.255
!
interface FastEthernet0/0
ip address 172.16.1.2 255.255.255.0
!
interface Serial0/1
ip address 172.16.2.2 255.255.255.0
!
router ospf 1
router-id 10.2.2.2
area 12 virtual-link 10.1.1.1
network 172.16.1.2 0.0.0.0 area 12
network 172.16.2.2 0.0.0.0 area 13
!
end
Rack1R2#
Rack1R2#show ip ospf nei
Neighbor ID Pri State Dead Time Address
Interface
10.1.1.1 0 FULL/ - - 172.16.1.1
OSPF_VL1
10.1.1.1 1 FULL/BDR 00:00:35 172.16.1.1
FastEthernet0/0
10.3.3.3 0 FULL/ - 00:00:38 172.16.2.3
Serial0/1
Rack1R2#sho ip os vir
Virtual Link OSPF_VL1 to router 10.1.1.1 is up
Run as demand circuit
DoNotAge LSA allowed.
Transit area 12, via interface FastEthernet0/0, Cost of using 1
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)
Index 1/2, retransmission queue length 0, number of retransmission 1
First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
Last retransmission scan length is 1, maximum is 1
Last retransmission scan time is 0 msec, maximum is 0 msec
Rack1R2#
Rack1R3#sho run
Building configuration...
Current configuration : 1155 bytes
!
hostname Rack1R3
!
interface Loopback0
ip address 10.3.3.3 255.255.255.255
!
interface Serial1/3
ip address 172.16.2.3 255.255.255.0
clockrate 64000
!
router ospf 1
network 172.16.2.3 0.0.0.0 area 13
!
end
Rack1R3#show ip ospf nei
Neighbor ID Pri State Dead Time Address
Interface
10.2.2.2 0 FULL/ - 00:00:39 172.16.2.2
Serial1/3
Rack1R3#show ip route ospf
172.16.0.0/24 is subnetted, 2 subnets
O IA 172.16.1.0 [110/782] via 172.16.2.2, 00:00:46, Serial1/3
Rack1R3#
HTH,
Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
bdennis@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
Direct: 775-745-6404 (Outside the US and Canada)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Alexey Tolstenok
Sent: Friday, November 03, 2006 8:55 AM
To: Group study
Subject: IE Core WB Lab 3 Task 4.5
I'm confusing great with so many limitations. 3 areas, no area 0.
Configured virt-links and still have in 'sh ip ospf' output "Area
BACKBONE(0) (Inactive)"
No idea how to accomplish this. Any tips?
-- SY, Alexey
This archive was generated by hypermail 2.1.4 : Fri Dec 01 2006 - 08:05:45 ART