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Ron Trunk
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Rather than simply giving you an answer, here's a strategy to troublshoottroubleshoot OSPF problems.

If you're not seeing routes, then likely some routers are failing to become neighbors. Use show ip ospf neighbor brief to check that a router has all the neighbors it should.

If routers are not neighbors, check that they are pingable from each other. Then check the ospf parameters. debug ospf neighbors will report on ospf parameter mismatches.

If the routers are neighbors, but you're not seeing routes, start with the router sourcing the route and work your way back. Make sure the source router is actually advertising the route. If the routes don't cross the ABR, check that the area types are correct.

This will not solve every ospf problem, but it will give you the information you need to troubleshoot further.

Rather than simply giving you an answer, here's a strategy to troublshoot OSPF problems.

If you're not seeing routes, then likely some routers are failing to become neighbors. Use show ip ospf neighbor brief to check that a router has all the neighbors it should.

If routers are not neighbors, check that they are pingable from each other. Then check the ospf parameters. debug ospf neighbors will report on ospf parameter mismatches.

If the routers are neighbors, but you're not seeing routes, start with the router sourcing the route and work your way back. Make sure the source router is actually advertising the route. If the routes don't cross the ABR, check that the area types are correct.

This will not solve every ospf problem, but it will give you the information you need to troubleshoot further.

Rather than simply giving you an answer, here's a strategy to troubleshoot OSPF problems.

If you're not seeing routes, then likely some routers are failing to become neighbors. Use show ip ospf neighbor brief to check that a router has all the neighbors it should.

If routers are not neighbors, check that they are pingable from each other. Then check the ospf parameters. debug ospf neighbors will report on ospf parameter mismatches.

If the routers are neighbors, but you're not seeing routes, start with the router sourcing the route and work your way back. Make sure the source router is actually advertising the route. If the routes don't cross the ABR, check that the area types are correct.

This will not solve every ospf problem, but it will give you the information you need to troubleshoot further.

Source Link
Ron Trunk
  • 68k
  • 5
  • 66
  • 126

Rather than simply giving you an answer, here's a strategy to troublshoot OSPF problems.

If you're not seeing routes, then likely some routers are failing to become neighbors. Use show ip ospf neighbor brief to check that a router has all the neighbors it should.

If routers are not neighbors, check that they are pingable from each other. Then check the ospf parameters. debug ospf neighbors will report on ospf parameter mismatches.

If the routers are neighbors, but you're not seeing routes, start with the router sourcing the route and work your way back. Make sure the source router is actually advertising the route. If the routes don't cross the ABR, check that the area types are correct.

This will not solve every ospf problem, but it will give you the information you need to troubleshoot further.