Cisco EtherSwitch Service Modules Feature Guide
Information About the Cisco EtherSwitch Service Modules
•Other Considerations for Cluster Standby Groups, page 28
•Automatic Recovery of Cluster Configuration, page 29
•IP Addresses in Clusters, page 30
•Hostnames in Clusters, page 30
•Passwords in Clusters, page 31
•SNMP Community Strings in Clusters, page 31
•Switch Clusters and Switch Stacks, page 31
•TACACS+ and RADIUS in Clusters, page 33
•Availability of
Cluster Compatibility
When creating a device cluster or adding a devices to a cluster, follow these guidelines:
•When you create a device cluster, we recommend configuring the
•If you are managing the cluster through Network Assistant, the device that has the latest software should be the cluster command switch.
•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:
•It has an IP address.
•Clustering and the HTTP server are enabled (the default).
•CDP version 2 is enabled (the default).
•It is not a command device or a member in another cluster.
•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:
•It has an IP address.
•It has CDP version 2 enabled.
•It is connected to the command device and to other standby command devices through its management VLAN.
•It is connected to all other cluster members through a common VLAN.
•It is redundantly connected to the cluster so that connectivity to members is maintained.
•It is not a command device or a member in another cluster.
Cisco IOS Release 12.2(25)SEC
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