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Catalyst 3750 SwitchSoftware Configuration Guide
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Chapter6 Clustering Switches
Using SNMP to Manage Switch Clusters
Command-switch privilege levels map to the Catalyst1900 and Catalyst 2820 cluster member switches
running standard and Enterprise Edition Software as follows:
•If the command-switch privilege level is 1 to 14, the cluster member switch is accessed at privilege
level 1.
•If the command-switch privilege level is 15, the cluster member switch is accessed at privilege level
15.
Note The Catalyst 1900 and Catalyst 2820 CLI is available only on switches running Enterprise
Edition Software.
For more information about the Catalyst1900 and Catalyst 2820 switches, refer to the installation and
configuration guides for those switches.
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 32-6. On Catalyst1900 and Catalyst 2820 switches, SNMP is enabled by default.
When you create a cluster, the cluster command switch manages the exchange of messages between
cluster member switches and an SNMP application. The cluster software on the cluster command switch
appends the cluster member switch number (@esN, where N is the switch number) to the first configured
read-write and read-only community strings on the cluster command switch and propagates them to the
cluster member switch. The cluster command switch uses this community string to control the
forwarding of gets, sets, and get-next messages between the SNMP management station and the cluster
member switches.
Note When a cluster standby group is configured, the cluster command switch can change without your
knowledge. Use the first read-write and read-only community strings to communicate with the cluster
command switch if there is a cluster standby group configured for the cluster.
If the cluster member switch does not have an IP address, the cluster command switch redirects traps
from the cluster member switch to the management station, as shown in Figure6-8. If a cluster member
switch has its own IP address and community strings, the cluster member switch can send traps directly
to the management station, without going through the cluster command switch.
If a cluster member switch has its own IP address and community strings, they can be used in addition
to the access provided by the cluster command switch. For more information about SNMP and
community strings, see Chapter 32, “Configuring SNMP.”