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Cisco backup interface supported on 12000 GSR

Hello Experts,

If there are any experts familiar with the cisco command backup interface can you please let me know if its supported on 12000 GSR: IOS (tm) GS Software (C12KPRP-K4P-M), Version 12.0(32)SY7, RELEASE SOFTWARE (fc1)?

I need to know if it can support Gigabitethernet on a 12000 GSR

The official usage guideline from Cisco is as follows:

Usage Guidelines

The interface you define with this command can back up only one other interface.

Routers support only serial and ISDN backup interfaces. Access servers support both asynchronous and serial backup interfaces.

In Cisco IOS Release 12.2(33)SRB1 and later releases, you can configure a backup interface for Gigabit Ethernet on the Cisco 7600 router

However, I just need to know if its supported on 12000 GSR GE's?

Cheers

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