OPSF 10 Mbps EoSDH Link and E1 links as a backup

Unanswered Question
Dec 24th, 2007

Dear Experts ,

Please find the enclosed network diagram.

I know how to configure OSPF between two L3 switches.

I want to use E1 links as a backup for 10Mbps EoSDH link.

Means whenever 10Mbps Link between switches goes down , traffic should be diverted from Switch 1 to R1 to R3 to Switch 2.

R1 , R2 and R3 has static routes to reach one another and switches.

How to make 2Mbps as a backup for 10Mbps (ospf) Link.

Is it possible using static routes on all devices ? Any idea whould be apprciated.



I have this problem too.
0 votes
  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
Richard Burts Mon, 12/24/2007 - 10:10


If you have correct static routes configured on R1, R2, and R3 to be able to reach the destinations, then I would think that a simple floating static route on both switches would do what you want. As long as OSPF is advertising the destinations its better AD should assure that it is in the routing table and is used. And if the OSPF link fails then the OSPF routes would be withdrawn from the routing table. This would allow the floating static routes to be put into the table and the traffic should flow through R1, R2, and R3.




This Discussion