Cisco Catalyst 2950 Software Configuration Manual page 115

Chapter 6 Clustering Switches
Using SNMP to Manage Switch Clusters
When you create a cluster, the command switch manages the exchange of messages between member
switches and an SNMP application. The cluster software on the command switch appends the member
switch number (@esN, where N is the switch number) to the first configured read-write and read-only
community strings on the command switch and propagates them to the member switch. The command
switch uses this community string to control the forwarding of gets, sets, and get-next messages between
the SNMP management station and the member switches.
When a cluster standby group is configured, the command switch can change without your knowledge.
Note
Use the first read-write and read-only community strings to communicate with the command switch if
there is a cluster standby group configured for the cluster.
If the member switch does not have an IP address, the command switch redirects traps from the member
switch to the management station, as shown in Figure 6-1. If a member switch has its own IP address
and community strings, the member switch can send traps directly to the management station, without
going through the command switch.
If a member switch has its own IP address and community strings, they can be used in addition to the
access provided by the command switch. For more information about SNMP and community strings, see
Chapter 27, "Configuring SNMP."
Figure 6-1 SNMP Management for a Cluster
SNMP Manager
Command switch
Trap 1, Trap 2, Trap 3
Member 1 Member 2 Member 3
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