SNMP Manager

The SNMP Manager page allows you to set one system SNMP configuration to enable management across the entire cluster.

With the SNMP Manager page, you can:

The command switch receives SNMP requests from the SNMP management station and determines whether the request is for itself or for a member switch. If the request is for itself, the SNMP agent on the command switch processes and responds to the request. If the request is for a member switch, the command switch redirects the request to the specified member. The SNMP agent on the member switch processes the request and sends a response to the requester (the command switch), which transmits the response to the original requester (the management station).

When a switch becomes an active member of the cluster, the command switch adds SNMP read-only and read/write community strings, which serve as passwords for SNMP messages, for the member. The command switch identifies a member community string by its switch number when it joined the cluster. The command switch receives SNMP traps, which are system alerts sent by a member, and relays them to the trap manager.

If you modify the community strings or traps on the command switch, the community strings or traps on the member switches are also modified.

Disabling or Enabling SNMP

Note: Disabling the SNMP agent prevents SNMP applications from accessing the cluster. As a result, you cannot generate reports, which requires SNMP to be enabled with the community string set to "public."

To disable SNMP (enabled by default):

  1. Select the Disable radio button.
  2. Click OK.
    Disabling SNMP causes the Community Strings and Trap Managers section to be disabled (grayed out).
  3. In Cluster Manager, click Save Config to save the configuration change to nonvolatile memory.

To reenable SNMP, select the Enable radio button and click OK.

Adding and Removing Community Strings

Community strings serve as passwords for SNMP messages. You can enter community strings with read only (RO) or read/write (RW) capabilities. SNMP requests with read-only capability allow for the display of MIB-object information. SNMP requests with read/write capability allow for the display and setting of MIB object information.

To add a new community string to the cluster:

  1. In the Community Strings Name field, enter a character string (of any length).
  2. Click the Read Only or Read/Write radio button.
  3. Click Add>>.
    The new community string appears in the Current Community Strings list.
  4. In Cluster Manager, click Save Config to save the configuration change to nonvolatile memory.

To remove an existing community string from the cluster:

  1. In the Current Community Strings list, select the community string to be deleted.
  2. Click Remove.
  3. In Cluster Manager, click Save Config to save the configuration change to nonvolatile memory.

Adding and Removing Trap Managers

A trap manager is a management station that receives traps, which are the system alerts generated by the switch. By default, no trap manager is defined, and no traps are issued.

To add a new trap manager:

  1. In the Trap Manager IP Address field, enter the IP address of the new trap manager.
  2. In the Community field, enter the community string (of any length) for the new trap manager.
  3. Select one or more of the following check boxes to limit the traps sent to a trap manager:
    Config to generate a trap on all changes to the switch configuration.
    TTY to generate a trap when the switch starts an ASCII (management console) session.
    VTP to generate a trap for each VLAN Trunk Protocol (VTP) change (Enterprise Edition Software only).
    SNMP to generate the supported SNMP traps.
    C2900/C3500 to generate Catalyst 2900 XL or Catalyst 3500 XL specific traps, such as the trap on address violation or broadcast storm level exceeded. These traps are included in the private enterprise MIB.
    VLAN membership to generate a trap for each VLAN Membership Policy Server (VMPS) change (Enterprise Edition Software only).
  4. Click Add>>.
    The new trap manager appears in the Current Trap Managers list box.
  5. In Cluster Manager, click Save Config to save the configuration change to nonvolatile memory.

To remove an existing trap manager from the cluster:

  1. In the Current Trap Managers list, select the trap manager to be deleted.
  2. Click Remove.
  3. In Cluster Manager, click Save Config to save the configuration change to nonvolatile memory.