Cisco "backup interface" command question

By noobchai ·
Hi, Could anyone tell me more about cisco "backup interface" command used for ?

For example :-

Router(config)# int gi0/0
Router(config-if)# backup interface gi0/1
Router(config-if)# ip address

Router(config)# int gi0/1
Router(config-if)# ip address

With the above configurations, interface gi0/0 is my current active link, and the link status for gi0/1 is standby. Once the gi0/0 link is down, interface gi0/1 will automatically takeover and be the active link.

So i can also achieving link redundancy by using and configure the backup interface command, my guts tell me this is not same with either HSRP, VRRP or GLBP. (am i right?). So what is the technologies or protocol am i using ?

Can "backup interface" be consider as same with the others redundancy link protocols such as HSRP, VRRP or GLBP, or are totally different one ?

Thank you so much for the help.

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Backup Interface

by NetMan1958 In reply to Cisco "backup interface" ...

The backup interface is usually used in a situation where you don't want to use your secondary link unless absolutely necessary. For instance, your secondary link is ISDN and you are charged by the minute for it's usage.

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by Mohammad Oweis In reply to Backup Interface

Usually backup command is used along with ISDN configuration, where you want the backup interface to work only when the primary interface is down, and as soon as the primary interface is up the backup interface will go down.

Its used for backup lines, whether it was ISDN or another Leased Line.

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