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Catalyst 3550 Multilayer Switch Software Configuration Guide
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Chapter 6 Clustering Switches
Creating a Switch Cluster
• When the command switch is a non-LRE Catalyst 2950 switch running Cisco IOS
Release 12.1(6)EA2 or later, all standby command switches must be non-LRE Catalyst 2950
switches running Cisco IOS Release 12.1(6)EA2 or later.
• When the command switch is running Cisco IOS Release 12.0(5)WC2 or earlier, the standby
command switches can be these switches: Catalyst 2900 XL, non-LRE Catalyst 2950, and
Catalyst 3500 XL switches.
These abbreviations are appended to the switch host names in the Standby Command Group list to show
their eligibility or status in the cluster standby group:
• AC—Active command switch
• SC—Standby command switch
• PC—Member of the cluster standby group but not the standby command switch
• HC—Candidate switch that can be added to the cluster standby group
• CC—Command switch when HSRP is disabled
You must enter a virtual IP address for the cluster standby group. This address must be in the same subnet
as the IP addresses of the switch. The group number must be unique within the IP subnet. It can be from
0 to 255, and the default is 0. The group name can have up to 31 characters.
The Standby Command Configuration window uses the default values for the preempt and name
commands that you have set by using the CLI. If you use this window to create the HSRP group, all
switches in the group have the preempt command enabled. You must also provide a name for the group.
Note The HSRP standby hold time interval should be greater than or equal to 3 times the hello time interval.
The default HSRP standby hold time interval is 10 seconds. The default HSRP standby hello time
interval is 3 seconds. For more information about the standby hold time and hello time intervals, see
the“Configuring HSRP Authentication and Timers” section on page 32-9.
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