Quick Reference Guide

14 PowerConnect B-Series TI24X Configuration Guide
53-1002269-02
Configuring basic system parameters
2
• If you specify a loopback interface as the single source for SNMP traps, SNMP trap receivers
can receive traps regardless of the states of individual links. Thus, if a link to the trap receiver
becomes unavailable but the receiver can be reached through another link, the receiver still
receives the trap, and the trap still has the source IP address of the loopback interface.
To specify a port, loopback interface, or virtual interface whose lowest-numbered IP address the
device must use as the source for all SNMP traps sent by the device, use the following CLI method.
To configure the device to send all SNMP traps from the first configured IP address on port 4, enter
the following commands.
PowerConnect(config)# snmp trap-source ethernet 4
PowerConnect(config)# write memory
Syntax: snmp-server trap-source loopback num | ethernet <portnum> | ve num
The num parameter is a loopback interface or virtual interface number.
To specify a loopback interface as the SNMP trap source for the device, enter commands such as
the following.
PowerConnect(config)# int loopback 1
PowerConnect(config-lbif-1)# ip address 10.0.0.1/24
PowerConnect(config-lbif-1)# exit
PowerConnect(config)# snmp-server trap-source loopback 1
The commands in this example configure loopback interface 1, assign IP address 10.00.1/24 to
the loopback interface, then designate the interface as the SNMP trap source for this device.
Regardless of the port the device uses to send traps to the receiver, the traps always arrive from
the same source IP address.
Setting the SNMP trap holddown time
When a device starts up, the software waits for Layer 2 convergence (STP) and Layer 3
convergence (OSPF) before beginning to send SNMP traps to external SNMP servers. Until
convergence occurs, the device might not be able to reach the servers, in which case the messages
are lost.
By default, a device uses a one-minute holddown time to wait for the convergence to occur before
starting to send SNMP traps. After the holddown time expires, the device sends the traps,
including traps such as “cold start” or “warm start” that occur before the holddown time expires.
You can change the holddown time to a value from one second to ten minutes.
To change the holddown time for SNMP traps, enter a command such as the following at the global
CONFIG level of the CLI.
PowerConnect(config)# snmp-server enable traps holddown-time 30
The command in this example changes the holddown time for SNMP traps to 30 seconds. The
device waits 30 seconds to allow convergence in STP and OSPF before sending traps to the SNMP
trap receiver.
Syntax: [no] snmp-server enable traps holddown-time secs
The secs parameter specifies the number of seconds and can be from 1 – 600 (ten minutes). The
default is 60 seconds.