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19-16
Cisco Nexus 7000 Series NX-OS Unicast Routing Configuration Guide, Release 4.x
OL-20002-02
Chapter 19 Configuring HSRP
Configuring HSRP
To customize HSRP, use the following commands in interface configuration mode:
Configuring Extended Hold Timers for HSRP
You can configure HSRP to use extended hold timers to support extended NSF during a controlled
(graceful) switchover or ISSU, including software upgrades and supervisor switchovers.You should
configure extended hold timers on all HSRP routers. (see the “High Availability and Extended Non-Stop
Forwarding” section on page 19-6).
Note You must configure extended hold timers on all HSRP routers if you configure extended hold timers. If
you configure a non-default hold timer, you should configure the same value on all HSRP routers when
you configure HSRP extended hold timers.
preempt [delay [minimum
seconds
]
[reload
seconds
] [sync
seconds
]]
Example:
switch(config-if-hsrp)# preempt delay
minimum 60
Configures the router to take over as an active router for
an HSRP group if it has a higher priority than the current
active router. This command is disabled by default. The
range is from 0 to 3600 seconds.
timers [msec]
hellotime
[msec]
holdtime
Example:
switch(config-if-hsrp)# timers 5 18
Configures the hello and hold time for this HSRP member
as follows:
• hellotime—The interval between successive hello
packets sent. The range is from 1 to 254 seconds.
• holdtime—The interval before the information in the
hello packet is considered invalid. The range is from
3 to 255.
The optional msec keyword specifies that the argument is
expressed in milliseconds, instead of the default seconds.
The timer ranges for milliseconds are as follows:
• hellotime—The interval between successive hello
packets sent. The range is from 255 to 999
milliseconds.
• holdtime—The interval before the information in the
hello packet is considered invalid. The range is from
750 to 3000 milliseconds.
Command Purpose
Command or Action Purpose
hsrp delay minimum
seconds
Example:
switch(config-if)# hsrp delay minimum
30
Specifies the minimum amount of time that HSRP waits
after a group is enabled before participating in the group.
The range is from 0 to 10000 seconds. The default is 0.
hsrp delay reload
seconds
Example:
switch(config-if)# hsrp delay reload
30
Specifies the minimum amount of time that HSRP waits
after reload before participating in the group. The range
is from 0 to 10000 seconds. The default is 0.
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