0000.0c07.ac**   (where ** is the HSRP group number)

Enables the router with highest priority to immediately become the Active router

Disabled by default

To enable

#standby group preempt

Default value: 100

Range: 0 to 255

Highest value preferred

Highest IP address used as a tiebreaker

To configure

standby [group] [priority number] [preempt [delay [minimum] seconds] [sync seconds]]

Allows to specify an interface on the router for the HSRP process to monitor in order to alter the HSRP priority for a given group if the interface fails

To configure: standby [group] track interface [priority] decrement [value]

Default decrement value: 10

Preemption must be enabled for another router to take over the Active role when priority goes down

interface ethernet0
     ip address 10.1.1.1 255.255.255.0
     standby 0 ip 10.1.1.3 
     standby 0 priority 110
     standby 0 track serial0 10
     standby 0 track serial1 10
     standby 0 preempt

#show standby [brief][vlan vlan-id | interf]

• brief option displays
  • Group
  • Priority
  • State
  • IP of Active and Standby routers and group IP

• Without brief option
  
  • State
  • Priority
  • Timers
  • IPs
  • MAC
  • Authentication

debug condition standby interface group

debug standby

debug standby terse

debug standby errors

debug standby packets[[all | terse] | [advertise | coup | hello | resign]] [detail]

debug standby events [[all | terse] | [icmp | protocol | redundancy | track]] [detail]

HSRP States

Initial: On initial configuration

Learn: The router has not determined the virtual IP address and has not yet seen Hello message from the Active router

Listen: The router knows the virtual IP address, but the router is neither the Active router nor the Standby router

Speak: router sends periodic hello messages and actively participates in the election of the active and/or standby router

Standby

Active