I have an ISDN BRI as the backup for T1 link.If I configure the BRI interface as the backup for T1 then in the Show ISDN Status layer 1 shows as deactivated.But if I configure a dialer interface as the backup for the T1 then layer is active and backup is working properly.What can be the problem when I use a physical interface as the back up for T1 line.
There will be no problem..If you use interface (physical or dialer) with a backup command, that interface will be in "standby" mode untill the primary interface becomes down/down or up/down....You can verify what using "sh interface xxx"
With that router will disable the layer 1 for that physical interface..
But for dialer interface, its a virtual interface used for DDR..so when you use "backup interface dialer x", only dialer interface will go in standby mode..BRI interface will remain as it is..
Its always a better idea to have backup command with dialer interface to avoid bri line with down/down mode which can trigger alarm to Some telco switches which telco people don't like that.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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