02-22-2023 04:08 AM - last edited on 02-23-2023 01:09 AM by Translator
Hi all,
hope you can help me.
I've been having an issue with OSPF that unfortunately I can't seem to figure it out. I have the following design:
Where if I disconnect VLan 5, I stop seeing Switch 2 (all switches are 9300). I can see that in the switches 3,4 and 5 I can ping switch 2, but not from switch 1. Was checking the OSPF Database on switch 1 and can see the LSA in there with the route to Switch, but this is not being injected in the routing table from the switch.
I have the following configuration below in the switches. Do you know what can be causing this?
And the switches have the following config for the OSPF:
Switch 1:
interface Vlan4005
description
ip address 10.5.254.1 255.255.255.248
ip pim sparse-mode
ip ospf network point-to-point
!
interface Vlan4011
description
ip address 10.11.254.2 255.255.255.252
ip pim sparse-mode
ip ospf network point-to-point
!
router ospf 1
auto-cost reference-bandwidth 10000
passive-interface Vlan20
passive-interface Vlan30
passive-interface Vlan40
passive-interface Vlan50
network 10.4.254.0 0.0.0.7 area 0
network 10.4.255.255 0.0.0.0 area 0
network 10.5.0.0 0.0.255.255 area 0
network 10.11.254.0 0.0.0.3 area 1
Switch 2:
interface Vlan4004
description
ip address 10.4.254.1 255.255.255.248
ip pim sparse-mode
ip ospf network point-to-point
!
interface Vlan4008
description
ip address 10.8.254.1 255.255.255.252
ip pim sparse-mode
ip ospf network point-to-point
!
router ospf 1
auto-cost reference-bandwidth 10000
passive-interface Vlan20
passive-interface Vlan30
passive-interface Vlan40
passive-interface Vlan50
network 10.3.254.0 0.0.0.7 area 0
network 10.3.255.255 0.0.0.0 area 0
network 10.4.0.0 0.0.255.255 area 0
network 10.8.254.0 0.0.0.3 area 1
Switch 3:
interface Vlan4008
description
ip address 10.8.254.2 255.255.255.252
ip pim sparse-mode
ip ospf network point-to-point
!
interface Vlan4009
description
ip address 10.9.254.1 255.255.255.252
ip pim sparse-mode
ip ospf network point-to-point
!
router ospf 1
auto-cost reference-bandwidth 10000
passive-interface Vlan30
passive-interface Vlan40
passive-interface Vlan50
network 10.8.0.0 0.0.255.255 area 1
network 10.9.254.0 0.0.0.3 area 1
Switch 4:
interface Vlan4009
description
ip address 10.9.254.2 255.255.255.252
ip pim sparse-mode
ip ospf network point-to-point
!
interface Vlan4010
description
ip address 10.10.254.1 255.255.255.252
ip pim sparse-mode
ip ospf network point-to-point
!
router ospf 1
auto-cost reference-bandwidth 10000
passive-interface Vlan30
passive-interface Vlan40
passive-interface Vlan50
network 10.9.0.0 0.0.255.255 area 1
network 10.10.254.0 0.0.0.3 area 1
Switch 5:
interface Vlan4010
description
ip address 10.10.254.2 255.255.255.252
ip pim sparse-mode
ip ospf network point-to-point
!
interface Vlan4011
description
ip address 10.11.254.1 255.255.255.252
ip pim sparse-mode
ip ospf network point-to-point
!
router ospf 1
auto-cost reference-bandwidth 10000
redistribute static
passive-interface Vlan30
passive-interface Vlan40
passive-interface Vlan50
network 10.10.0.0 0.0.255.255 area 1
network 10.11.254.0 0.0.0.3 area 0
Thank you!
Solved! Go to Solution.
02-22-2023 06:23 AM
Optimizing OSPF Behavior > OSPF Implementation | Cisco Press
this is because you face split area 0
you need virtual link to connect both ABR
02-22-2023 06:23 AM
Optimizing OSPF Behavior > OSPF Implementation | Cisco Press
this is because you face split area 0
you need virtual link to connect both ABR
02-22-2023 06:49 AM
thank you @MHM Cisco World ! It was exactly that. All sorted
02-22-2023 06:57 AM
You are so so welcome
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