Understanding Snmp; Configuring Snmp - Cisco Catalyst 3560-X Software Configuration Manual

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This chapter describes how to configure the Simple Network Management Protocol (SNMP) on the

Catalyst 3750-X or 3560-X switch. Unless otherwise noted, the term switch refers to a Catalyst 3750-X

or 3560-X standalone switch and to a Catalyst 3750-X switch stack.

For complete syntax and usage information for the commands used in this chapter, see the command

reference for this release and the Cisco IOS Network Management Command Reference, Release 12.4.

Understanding SNMP

SNMP is an application-layer protocol that provides a message format for communication between

managers and agents. The SNMP system consists of an SNMP manager, an SNMP agent, and a MIB.

The SNMP manager can be part of a network management system (NMS) such as CiscoWorks. The agent

and MIB reside on the switch. To configure SNMP on the switch, you define the relationship between

the manager and the agent.

The SNMP agent contains MIB variables whose values the SNMP manager can request or change. A

manager can get a value from an agent or store a value into the agent. The agent gathers data from the

MIB, the repository for information about device parameters and network data. The agent can also

respond to a manager's requests to get or set data.

An agent can send unsolicited traps to the manager. Traps are messages alerting the SNMP manager to

a condition on the network. Traps can mean improper user authentication, restarts, link status (up or

down), MAC address tracking, closing of a TCP connection, loss of connection to a neighbor, or other

significant events.

On the Catalyst 3750-X switch, the stack master handles the SNMP requests and traps for the whole

switch stack. The stack master transparently manages any requests or traps that are related to all stack

members. When a new stack master is elected, the new master continues to handle SNMP requests and

traps as configured on the previous stack master, assuming that IP connectivity to the SNMP

management stations is still in place after the new master has taken control.

For more information about switch stacks, see

Understanding SNMP, page 1-1

Configuring SNMP, page 1-6

Displaying SNMP Status, page 1-19

C H A P T E R

Chapter 1, "Managing Switch Stacks."

Catalyst 3750-X and 3560-X Switch Software Configuration Guide

Catalyst 3750-x