Cisco EtherSwitch Service Modules Feature Guide
Information About the Cisco EtherSwitch Service Modules
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Cisco IOS Release 12.2(25)SEC
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Other Considerations for Cluster Standby Groups, page 28
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Automatic Recovery of Cluster Configuration, page 29
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IP Addresses in Clusters, page 30
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Hostnames in Clusters, page 30
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Passwords in Clusters, page 31
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SNMP Community Strings in Clusters, page 31
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Switch Clusters and Switch Stacks, page 31
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and RADIUS in Clusters, page 33
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Availability of Switch-Specific Features in Switch Clusters, page 33
Cluster Compatibility
When creating a device cluster or adding a devices to a cluster, follow these guidelines:
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When you create a device cluster, we recommend configuring the highest-end device in your cluster
as the cluster command switch.
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If you are managing the cluster through Network Assistant, the device that has the latest software
should be the cluster command switch.
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The standby cluster command switch must be the same type as the command device. For example,
if the command device is a Cisco EtherSwitch service module, all standby command devices must
be either Cisco EtherSwitch service modules or Catalyst 3750 switches.
Command Device Characteristics
A command device must meet these requirements:
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It has an IP address.
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Clustering and the HTTP server are enabled (the default).
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CDP version 2 is enabled (the default).
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It is not a command device or a member in another cluster.
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It is connected to standby command devices through the management VLAN and to cluster members
through a common VLAN.
Standby Command Device Characteristics
A standby command device must meet these requirements:
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It has an IP address.
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It has CDP version 2 enabled.
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It is connected to the command device and to other standby command devices through its
management VLAN.
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It is connected to all other cluster members through a common VLAN.
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It is redundantly connected to the cluster so that connectivity to members is maintained.
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It is not a command device or a member in another cluster.
