Configuring ethernet link as backup to serial link

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May 5th, 2009
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I have two 2 MB Link terminated to my router of which one is serial and other is an Ethernet termination. How can i configure the Ethernet link to act as a backup to serial(no load balancing required).

Presently i have added both the interface in ospf. Since the Ethernet Interface bandwidth is 100Mbps, the route is being taken in Ethernet and serial is been taken as backup. I have intermediate packet drops also.However there is no packet drop when i use the link individually.

Can i configure the interface as a standby in some way?

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Giuseppe Larosa Tue, 05/05/2009 - 02:25
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Hello Rajesh,

if you are using OSPF and you want to have the serial link preferred

int fas0/0

ip ospf cost 100

note: you need to do this on both sides of the ethernet link.

after this the serial link should be the primary link for its lower cost.

Hope to help



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