What are the types of primary and backup interfaces supported by interface backup

Primary interfaces: Ethernet Layer 3 interface and subinterface, dialer interface, ATM interface, ISDN BRI interface, Async interface, cellular interface, PON interface, MP-group interface, MFR interface, FR subinterface, and serial interface and subinterface.

Backup interfaces: Ethernet Layer 3 interface and subinterface, dialer interface, ATM interface, BRI interface, Async interface, cellular interface, MP-group interface, MFR interface and subinterface, and serial interface and subinterface.

On the AR120&AR150&AR160&AR200 device, primary and backup interfaces cannot be ISDN BRI interfaces, PON interfaces, or Async interfaces.

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