Cisco WS-C2960S-24PD-L Software Guide - Page 127
Using SNMP to Manage Switch Clusters
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Chapter 5 Clustering Switches Using SNMP to Manage Switch Clusters Using SNMP to Manage Switch Clusters When you first power on the switch, SNMP is enabled if you enter the IP information by using the setup program and accept its proposed configuration. If you did not use the setup program to enter the IP information and SNMP was not enabled, you can enable it as described in the "Configuring SNMP" section on page 6-48. On Catalyst 1900 and Catalyst 2820 switches, SNMP is enabled by default. 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. Note When a cluster standby group is configured, the command switch can change without your knowledge. 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 5-13. 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 the "Configuring SNMP" section on page 6-48. Figure 5-13 SNMP Management for a Cluster SNMP Manager Command switch Trap 1, Trap 2, Trap 3 Trap Trap 33020 Trap Member 1 Member 2 Member 3 78-6511-08 Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide 5-27