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18-7
Catalyst 3550 Multilayer Switch Software Configuration Guide
78-11194-03
Chapter 18 Configuring SNMP
Configuring SNMP
Configuring Trap Managers and Enabling Traps
A trap manager is a management station that receives and processes traps. Traps are system alerts that
the switch generates when certain events occur. By default, no trap manager is defined, and no traps are
issued.
Switches running this IOS release can have an unlimited number of trap managers. Community strings
can be any length.
Table 18-3 describes the supported switch traps (notification types). You can enable any or all of these
traps and configure a trap manager to receive them.
Note Though visible in the command-line help string, the hsrp keyword takes affect only when the
enhanced multilayer software image (EMI) is installed. All Catalyst 3550 Gigabit Ethernet switches
ship with the EMI installed. Catalyst 3550 Fast Ethernet switches can be shipped with either the
standard multilayer software image (SMI) or EMI pre-installed. You can order the Enhanced
Multilayer Software Image Upgrade kit to upgrade Catalyst 3550 Fast Ethernet switches from the
SMI to the EMI.
Some notification types cannot be controlled with the snmp-server enable global configuration
command, for example, tty and udp-port. These notification types are always enabled. You can use the
snmp-server host global configuration command to a specific host to receive the notification types
listed in Table 18-3.
Table 18-3 Switch Notification Types
Notification Type Description
cluster Generates a trap when the cluster configuration changes.
config Generates a trap for SNMP configuration changes.
entity Generates a trap for SNMP entity changes.
HSRP Generates a trap for Hot Standby Router Protocol (HSRP) changes.
MAC notification Generates a trap for MAC address notifications.
RTR Generates a trap for the SNMP Response Time Reporter (RTR).
SNMP Generates a trap for SNMP-type notifications.
TTY Sends Cisco enterprise-specific notifications when a Transmission Control
Protocol (TCP) connection closes.
UDP-port Sends notification of the User Datagram Protocol (UDP) port number of the
host.
VTP Generates a trap for VLAN Trunking Protocol (VTP) changes.