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Configuring Router Redundancy
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• Authentication String – Key used to authenticate HSRP packets received from
other routers. (Range: 1-8 alphanumeric characters)
- All routers in the same HSRP group must be configured with the same
authentication string. When a HSRP packet is received from another router in
the group, its authentication string is compared to the string configured on this
router. If the strings match, the message is accepted. Otherwise, the packet is
discarded.
- Plain text authentication does not provide any real security. It is supported only
to prevent a misconfigured router from participating in HSRP.
• Virtual IP – IP address of the virtual router, or secondary IP addresses assigned
to the current VLAN interface that are supported by the HSRP group.
• Mode – Sets this entry as the virtual IP address for the HSRP group (i.e., Primary),
or as a secondary IP addresses assigned to the current VLAN interface that is also
supported by the HSRP group. (Range: Primary, Secondary: Default: Primary)
• Tracking Interface – Specifies an interface to track. The HSRP priority of this
router will be changed whenever the interface goes down or comes back up by the
corresponding tracking priority.
- You can specify up to 32 IP interfaces to be tracked by this command.
- If you specify a VLAN interface that has not been configured with an IP address,
tracking will not affect the HSRP router priority.
• (Tracking) Priority – Amount by which the HSRP router priority is decremented (or
incremented) when the interface goes down (or comes back up). (Range: 1-255;
Default: 10)
- If you configure multiple tracked interfaces, and also set the interface priority, the
effect on HSRP router priority is cumulative when one or more interfaces go up
or down. However, if you configure multiple tracked interfaces, but do not set the
interface priority, HSRP router priority will only be changed by the default
interface priority value of 10; i.e., the effect is not cumulative.