From: Erick B. (erickbe@xxxxxxxxx)
Date: Fri Aug 23 2002 - 02:23:04 GMT-3
Jim,
Virtual Links are associated with the neighbors router
ID - not IP address of adjancent interface. The router
id by default is the highest IP address of any
physical interface, or the highest IP of a loopback if
there is a loopback interface configured. You can
manually configure the router-id as well. It doesn't
have to be a valid IP address on the router, just
needs to be a unique number in the OSPF domain.
HTH, Erick
--- jim.phillipo@guardent.com wrote:
> Take a look at these configs. How is router 3 using
> the Ethernet of router 4
> 137.20.40.1 as the virtual link end point ?
>
> The only way I have been able to make things work is
> to add a loopback to
> rtr 4 and use that as rtr3's link neighbor.
>
> Any thoughts ? I am losing my mind on this one.
>
> R4
> interface Ethernet0
> ip address 137.20.40.1 255.255.255.0
> area0---r3---area1-----r4---area40
> ipx network 400
> ipx type-20-propagation
> bridge-group 1
> !
> interface Serial0
> no ip address
> shutdown
> no fair-queue
> !
> interface Serial1
> ip address 137.20.103.2 255.255.255.0
> clockrate 2000000
> !
> router ospf 1
> log-adjacency-changes
> area 1 virtual-link 137.20.3.65
> network 137.20.40.1 0.0.0.0 area 40
> network 137.20.103.2 0.0.0.0 area 1
>
>
> r3
> interface Loopback0
> ip address 137.20.3.33 255.255.255.224
> ipx network 30000
> !
> interface Loopback1
> ip address 137.20.3.65 255.255.255.224
> ipx network 30001
> !
> !
> interface Serial0
> ip address 137.20.103.1 255.255.255.0
> !
> interface Serial1
> ip address 137.20.101.3 255.255.255.0
> encapsulation frame-relay
> ip ospf network point-to-multipoint
> ipx network 3150
> custom-queue-list 1
> clockrate 64000
> frame-relay map ip 137.20.101.1 301 broadcast
> frame-relay lmi-type ansi
> !
> interface TokenRing0
> ip address 137.20.30.1 255.255.255.0
> ipx network 300
> ipx type-20-propagation
> ring-speed 16
> source-bridge 1 1 10
> source-bridge spanning
> !
> router ospf 1
> log-adjacency-changes
> area 1 virtual-link 137.20.40.1
> area 31 range 137.20.3.0 255.255.255.0
> network 137.20.3.0 0.0.0.255 area 31
> network 137.20.30.1 0.0.0.0 area 30
> network 137.20.101.3 0.0.0.0 area 0
> network 137.20.103.1 0.0.0.0 area 1
> !
> !
>
> -----Original Message-----
> From: Jim Phillipo
> Sent: Thursday, August 22, 2002 8:07 PM
> To: ccielab@groupstudy.com
> Subject: OSPF Issue
>
>
> I am working on lab 3 of CCIE boot camp.
>
> I have a area that needs a virtual link to connect
> to the back
> bone.Everything appears ok, but the interface that
> is in the area that needs
> the virtual link is not in the routing table of the
> ABR connected to the
> Backbone. But the LSA is in its Database ?
>
>
> Any thoughts ?
>
> Here is the Database and route table: 137.20.40.0
> is the missing network
>
>
> OSPF Router with ID (137.20.3.65) (Process ID
> 64)
>
>
> Router Link States (Area 0)
>
> Link ID ADV Router Age Seq#
> Checksum Link count
> 137.20.3.65 137.20.3.65 603
> 0x80000005 0xA30A 3
> 137.20.101.1 137.20.101.1 1089
> 0x80000011 0x1B53 5
> 137.20.103.2 137.20.103.2 604
> 0x80000021 0x8022 2
> 172.168.32.1 172.168.32.1 894
> 0x80000004 0xEBBF 2
>
> Summary Net Link States (Area 0)
>
> Link ID ADV Router Age Seq#
> Checksum
> 137.20.30.0 137.20.3.65 1050
> 0x80000001 0x7A1F
> 137.20.30.0 137.20.103.1 2603
> 0x80000001 0x3D38
> 137.20.103.0 137.20.3.65 1107
> 0x80000001 0x9A7B
>
> Router Link States (Area 1)
>
> Link ID ADV Router Age Seq#
> Checksum Link count
> 137.20.3.65 137.20.3.65 617
> 0x80000004 0x1AB0 2
> 137.20.103.2 137.20.103.2 607
> 0x8000000E 0xE9B0 2
>
> Summary Net Link States (Area 1)
>
> Link ID ADV Router Age Seq#
> Checksum
> 1.0.0.0 137.20.103.2 30
> 0x80000001 0x8AA0
> 137.20.30.0 137.20.3.65 1053
> 0x80000001 0x7A1F
> 137.20.30.0 137.20.103.2 603
> 0x80000001 0xB97A
> 137.20.40.0 137.20.103.2 607
> 0x80000006 0xE67A
> 137.20.100.0 137.20.3.65 1080
> 0x80000001 0x3E9A
> 137.20.100.0 137.20.103.2 603
> 0x80000001 0x7DF5
> 137.20.101.1 137.20.3.65 1080
> 0x80000001 0xA670
> 137.20.101.1 137.20.103.2 603
> 0x80000001 0xE5CB
> 137.20.101.3 137.20.3.65 1110
> 0x80000001 0x1045
> 137.20.101.3 137.20.103.2 603
> 0x80000001 0x4FA0
> 137.20.101.5 137.20.3.65 593
> 0x80000001 0x1D1
> 137.20.101.5 137.20.103.1 1982
> 0x80000001 0xC3EA
>
> Router Link States (Area 30)
>
> Link ID ADV Router Age Seq#
> Checksum Link count
> 137.20.3.65 137.20.3.65 1058
> 0x80000002 0x1B90 1
>
> Summary Net Link States (Area 30)
>
> Link ID ADV Router Age Seq#
> Checksum
> 137.20.100.0 137.20.3.65 1081
> 0x80000001 0x3E9A
> 137.20.101.1 137.20.3.65 1632
> 0x80000001 0xA670
> 137.20.101.3 137.20.3.65 1662
> 0x80000001 0x1045
> 137.20.101.5 137.20.3.65 1145
> 0x80000001 0x1D1
> 137.20.103.0 137.20.3.65 1662
> 0x80000001 0x9A7B
> r3>
>
>
> r3>sho ip rou
> 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, ia - IS-IS inter
> area
> * - candidate default, U - per-user static
> route, o - ODR
> P - periodic downloaded static route
>
> Gateway of last resort is not set
>
> 137.20.0.0/16 is variably subnetted, 8 subnets,
> 3 masks
> C 137.20.30.0/24 is directly connected,
> TokenRing0
> C 137.20.3.32/27 is directly connected,
> Loopback0
> C 137.20.3.64/27 is directly connected,
> Loopback1
> C 137.20.101.0/24 is directly connected,
> Serial1
> O 137.20.101.1/32 [110/64] via 137.20.101.1,
> 00:19:46, Serial1
> O 137.20.100.0/24 [110/128] via 137.20.101.1,
> 00:19:46, Serial1
> C 137.20.103.0/24 is directly connected,
> Serial0
> O 137.20.101.5/32 [110/128] via 137.20.101.1,
> 00:19:47, Serial1
> r3>
>
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