Why does my Cisco 3640 not accept the Backup Interface command?
I have a 3640 with IOS 12.0(4)T with a Frame Relay serial interface and an ISDN BRI interface. When I enter "backup interface s0/0" under the BRI interface, I get "unrecognized command". When I enter "?" in BRI interface config mode, no backup commands are available. Yet there is no indication in any Cisco documentation that this command is not available with certain hardware, software, or router configuration. Why doesn't my router accept this command?
Re: Why does my Cisco 3640 not accept the Backup Interface comma
BRI interface along with the dialer interfaces are DDR capable interfaces which are always up/up spoofing and never go down..So there is no effect of backup command under that interface..So that command is not available for those interfaces..So no way to use "backup interface xxx" command under the interface which will remain up/up spoofing..
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