02-09-2008 01:41 AM - edited 03-05-2019 09:03 PM
Is it possible to have a fastethernet interface as a backup of more than one serial lines on a 7507 router ?
02-09-2008 01:51 AM
Hi,
If I assume that you want FastEthernet as a backup interface of Serial so it is possible. Also its depends how your network is designed.
i.e.
Router(config)#inty ser 0/0/0
Router(config-if)#backup interface fastEthernet ?
<0-0> FastEthernet interface number
Thanks
Goutam
pls rate if it works.
02-09-2008 02:16 AM
I use a 7507 with 15 serial lines and a second 7507 with 5 adsl-vpn lines. The two routers are connected together with fastethernet. I want to use the fastethenet for backup of all 15 seials.
02-09-2008 02:21 AM
Hi,
Not clear to me. Can u post the diagram?
Thanks
Goutam
02-09-2008 05:38 AM
konstantinos
While it may work for one interface I believe that trying to use any interface as backup for more than 1 interface is a problem. This is because the backup interface is put into a special state while the primary is up and the backup only becomes active when the primary is down. So if the FastEthernet is backup for serial 1 and 2 and serial 1 goes down I believe that the FastEthernet will not activate until both interfaces go down.
Perhaps an alternative might be to create a trunk on the FastEthernet with VLAN subinterfaces going over the trunk. Then you could use a subinterface as backup for the serial.
HTH
Rick
02-11-2008 03:37 AM
for what benifit does the backup interface command have to us ?
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