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Catalyst 3560 Switch Software Configuration Guide
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Chapter 5 Clustering Switches
Creating a Switch Cluster
Creating a Cluster Standby Group
The cluster standby group members must meet the requirements described in the “Standby Cluster
Command Switch Characteristics” section on page 5-3 and “HSRP and Standby Cluster Command
Switches” section on page 5-10. To create a cluster standby group, select Cluster > Standby Command
Switches (Figure 5-11).
Instead of using CMS to add switches to a standby group and to bind the standby group to a cluster, you
can use the standby ip, the standby name, and the standby priority interface configuration commands
and the cluster standby group global configuration command.
Note Standby cluster command switches must be the same type of switches as the cluster command switch.
For example, if the cluster command switch is a Catalyst 3560 switch, the standby cluster command
switches must also be Catalyst 3560 switches. Refer to the switch configuration guide of other
cluster-capable switches for their requirements on standby cluster command 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 cluster command switch
• SC—Standby cluster command switch
• PC—Member of the cluster standby group but not the standby cluster command switch
• HC—Candidate switch that can be added to the cluster standby group
• CC—Cluster 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 standby 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 three 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 standby hello time
intervals, see the “Configuring HSRP Authentication and Timers” section on page 31-8.
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