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Catalyst 3750-X and 3560-X Switch Software Configuration Guide
OL-25303-03
Chapter 1 Configuring HSRP and VRRP
Displaying HSRP Configurations
Displaying HSRP Configurations
From privileged EXEC mode, use this command to display HSRP settings:
show standby [interface-id [group]] [brief] [detail]
You can display HSRP information for the whole switch, for a specific interface, for an HSRP group, or
for an HSRP group on an interface. You can also specify whether to display a concise overview of HSRP
information or detailed HSRP information. The default display is detail. If there are a large number of
HSRP groups, using the show standby command without qualifiers can result in an unwieldy display.
This is a an example of output from the show standby privileged EXEC command, displaying HSRP
information for two standby groups (group 1 and group 100):
Switch# show standby
VLAN1 - Group 1
Local state is Standby, priority 105, may preempt
Hellotime 3 holdtime 10
Next hello sent in 00:00:02.182
Hot standby IP address is 172.20.128.3 configured
Active router is 172.20.128.1 expires in 00:00:09
Standby router is local
Standby virtual mac address is 0000.0c07.ac01
Name is bbb
VLAN1 - Group 100
Local state is Active, priority 105, may preempt
Hellotime 3 holdtime 10
Next hello sent in 00:00:02.262
Hot standby IP address is 172.20.138.51 configured
Active router is local
Standby router is unknown expired
Standby virtual mac address is 0000.0c07.ac64
Name is test
Configuring VRRP
VRRP is an election protocol that dynamically assigns responsibility for one or more virtual routers to
the VRRP routers on a LAN, allowing several routers on a multi-access link to use the same virtual IP
address. A VRRP router is configured to run VRRP in conjunction with one or more other routers
attached to a LAN. In a VRRP configuration, one router is elected as the virtual router master, and the
other routers act as backups in case it fails.
VRRP Limitations
• You can configure both HSRP and VRRP on a switch or switch stack. However, you cannot add a
switch model that supports only one protocol to a stack that is configured for both protocols.
• The VRRP implementation on the switch does not support the MIB specified in RFC 2787.
• The VRRP implementation on the switch supports only text-based authentication.
• The switch supports VRRP only for IPv4.
For more VRRP information and configuration instructions, see the Configuring VRRP feature module.
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