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Cisco IOS in a Nutshell, 2nd Edition by James Boney

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Name

standby authentication — interface

Synopsis

standby [group] authentication string
no standby [group] authentication string

Configures

HSRP authentication string

Default

Group, 0; authentication string, “cisco”

Description

This command enables authentication for a hot standby group. group specifies the hot standby group number, and string sets the authentication string (essentially a password). All HSRP routers must use the same authentication string in order to communicate. string can be from 1 to 8 characters long.

Example

interface serial 0
  ip address 10.1.2.1 255.255.255.0
  standby 1 authentication letmein

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