6-3
Catalyst 3750 Switch Software Configuration Guide
OL-8550-02
Chapter 6 Clustering Switches
Understanding Switch Clusters
Cluster Command Switch Characteristics
A cluster command switch must meet these requirements:
• It is running Cisco IOS Release 12.1(11)AX or later.
• It has an IP address.
• It has Cisco Discovery Protocol (CDP) version 2 enabled (the default).
• It is not a command or cluster member switch of another cluster.
• It is connected to the standby cluster command switches through the management VLAN and to the
cluster member switches through a common VLAN.
Standby Cluster Command Switch Characteristics
A standby cluster command switch must meet these requirements:
• It is running Cisco IOS 12.1(11)AX or later.
• It has an IP address.
• It has CDP version 2 enabled.
• It is connected to the command switch and to other standby command switches through its
management VLAN.
• It is connected to all other cluster member switches (except the cluster command and standby
command switches) through a common VLAN.
• It is redundantly connected to the cluster so that connectivity to cluster member switches is
maintained.
• It is not a command or member switch of another cluster.
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 3750 switch, the standby
cluster command switches must also be Catalyst 3750 switches. Refer to the switch
configuration guide of other cluster-capable switches for their requirements on standby cluster
command switches.
Catalyst 2900 XL (4-MB switches) 11.2(8.5)SA6 (recommended) Member switch only
Catalyst 1900 and 2820 9.00(-A or -EN) or later Member switch only
Table 6-1 Switch Software and Cluster Capability (continued)
Switch Cisco IOS Release Cluster Capability
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