From: Carlos G Mendioroz (tron@huapi.ba.ar)
Date: Tue Nov 07 2006 - 09:43:54 ART
I always thought (and teach) that VLs are in area 0.
Using a VL breaks the requirement of not having area 0 links,
so many OSPF domains would be the only choice as I see it ...
-Carlos
Richard Dumoulin @ 04/11/2006 09:58 -0300 dixit:
> Is this Cisco specific?
> I am curious to see what happens if R1 is reloaded. Will the routing keep its consistency? I guess I'll need to test it on my own
>
> -- Richard
>
> -----Message d'origine-----
> De : nobody@groupstudy.com [mailto:nobody@groupstudy.com] De la part de Brian Dennis
> Envoyi : Saturday, November 04, 2006 4:29 AM
> @ : Alexey Tolstenok; Group study
> Objet : RE: IE Core WB Lab 3 Task 4.5
>
> 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?
>
-- Carlos G Mendioroz <tron@huapi.ba.ar> LW7 EQI Argentina
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