03-25-2010 04:37 PM - edited 03-04-2019 07:55 AM
Hi,
I configured the OSPF as shown on the diagram in the attachment.
Senorio 1: All the ports on the switch initally on default VLAN and there was no problem in OSPF neigbour formation.
Senorio 2: I confiured the 2 different netwrok on 2 different VLAN. I though the OSPF Neibour will fail because there is no routing between the VLAN. But the neibour formation was successful. i even reload the routers.
My question is how did the routing protocols were excanged between the 2 Broadcast domain (i.e. Between 2 VLAN) when there is no routing between the 2 broadcast domain.
Regards
Logesh
03-25-2010 05:01 PM
Logesh
Can't read your attachments. Could you just post the configs + a jpg/png of the setup.
Jon
03-25-2010 05:25 PM
Hi,
Please find the diagram in the attachment and below is the configuration
R1: Configuration
interface FastEthernet0/0
ip address 172.30.49.1 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 10.1.14.1 255.255.255.252
duplex auto
speed auto
shutdown
!
router ospf 1
log-adjacency-changes
network 172.30.49.0 0.0.0.255 area 0
network 10.1.14.0 0.0.0.3 area 0
R4: Configuration
!
interface FastEthernet0/0
ip address 172.30.50.4 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 10.1.14.2 255.255.255.252
duplex auto
speed auto
!
router ospf 1
log-adjacency-changes
network 172.30.50.0 0.0.0.255 area 0
network 10.1.14.2 0.0.0.0 area 0
!
R3: Configuration
!
interface FastEthernet0/0
ip address 172.30.50.3 255.255.255.0
duplex auto
speed auto
!
router ospf 1
log-adjacency-changes
network 172.30.50.0 0.0.0.255 area 0
!
R2: Configuration
!
interface FastEthernet0/0
ip address 172.30.50.2 255.255.255.0
duplex auto
speed auto
!
router ospf 1
log-adjacency-changes
network 172.30.50.0 0.0.0.255 area 0
!
Senorio 1: Switch configuration
hostname Switch
!
!
!
interface FastEthernet0/1
description toR4
!
interface FastEthernet0/2
description toR3
!
interface FastEthernet0/3
description toR2
!
interface FastEthernet0/4
!
interface FastEthernet0/5
!
interface FastEthernet0/6
!
interface FastEthernet0/7
!
interface FastEthernet0/8
!
interface FastEthernet0/9
!
interface FastEthernet0/10
!
interface FastEthernet0/11
!
interface FastEthernet0/12
!
interface FastEthernet0/13
!
interface FastEthernet0/14
!
interface FastEthernet0/15
!
interface FastEthernet0/16
!
interface FastEthernet0/17
!
interface FastEthernet0/18
!
interface FastEthernet0/19
!
interface FastEthernet0/20
!
interface FastEthernet0/21
!
interface FastEthernet0/22
!
interface FastEthernet0/23
description toR4
!
interface FastEthernet0/24
description toR1
!
interface Vlan1
no ip address
shutdown
!
Senorio 2: Switch configuration
hostname Switch
!
!
!
interface FastEthernet0/1
description toR4
switchport access vlan2
!
interface FastEthernet0/2
description toR3
switchport access vlan2
!
interface FastEthernet0/3
description toR2
switchport access vlan2
!
interface FastEthernet0/4
!
interface FastEthernet0/5
!
interface FastEthernet0/6
!
interface FastEthernet0/7
!
interface FastEthernet0/8
!
interface FastEthernet0/9
!
interface FastEthernet0/10
!
interface FastEthernet0/11
!
interface FastEthernet0/12
!
interface FastEthernet0/13
!
interface FastEthernet0/14
!
interface FastEthernet0/15
!
interface FastEthernet0/16
!
interface FastEthernet0/17
!
interface FastEthernet0/18
!
interface FastEthernet0/19
!
interface FastEthernet0/20
!
interface FastEthernet0/21
!
interface FastEthernet0/22
!
interface FastEthernet0/23
description toR4
switchport access vlan3
!
interface FastEthernet0/24
description toR1
switchport access vlan3
!
interface Vlan 2
ip address 10.1.1.1 255.255.255.0
!
interface Vlan 3
ip address 10.2.2.2 255.255.255.0
!
Regards
Logesh
03-25-2010 05:37 PM
Thanks for that.
Can you post "sh ip ospf neighbors" from all routers.
Jon
03-25-2010 10:01 PM
Logesh,
Did you use vlan SVI's on the switch and advertise the IP in OSPF ?
Please do a sh ip ospf neigh on the routers and paste it here..
03-25-2010 11:14 PM
sh ip ospf neighbor
R1#sh ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
172.30.50.4 0 FULL/ - 00:00:33 10.1.14.2 FastEthernet0/1
R4#sh ip os neighbor
Neighbor ID Pri State Dead Time Address Interface
172.30.50.2 1 FULL/DROTHER 00:00:39 172.30.50.2 FastEthernet0/0
172.30.50.3 1 FULL/BDR 00:00:34 172.30.50.3 FastEthernet0/0
172.30.49.1 0 FULL/ - 00:00:34 10.1.14.1 FastEthernet0/1
R2#sh ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
172.30.50.3 1 FULL/BDR 00:00:35 172.30.50.3 FastEthernet0/0
172.30.50.4 1 FULL/DR 00:00:35 172.30.50.4 FastEthernet0/0
R3#sh ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
172.30.50.2 1 FULL/DROTHER 00:00:31 172.30.50.2 FastEthernet0/0
172.30.50.4 1 FULL/DR 00:00:36 172.30.50.4 FastEthernet0/0
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