Brocade BigIron RX Series Configuration Guide - Manual (Page 200)

122 BigIron RX Series Configuration Guide
53-1002484-04
Configuring Simple Network Management Protocol traps
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• 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 configure the device to send all SNMP traps from the first configured IP address on port 4/11,
enter the following commands.
BigIron RX(config)# snmp-server trap-source-interface ethernet 4/11
BigIron RX(config)# write memory
Syntax: snmp-server trap-source-interface loopback <num> | ethernet <slot/port> | ve <num>
The <num> parameter is a loopback interface or virtual routing interface number.
To specify a loopback interface as the device’s SNMP trap source, enter commands such as the
following.
BigIron RX(config)# int loopback 1
BigIron RX(config-lbif-1)# ip address 10.0.0.1/24
BigIron RX(config-lbif-1)# exit
BigIron RX(config)# snmp-server trap-source loopback 1
The commands configure loopback interface 1, gives it IP address 10.00.1/24, then designate it as
the SNMP trap source for the 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, the 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.
BigIron RX(config)# snmp-server enable traps holddown-time 30
The command 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 (1 – 600). The default is 60.
Disabling SNMP traps
The device comes with SNMP trap generation enabled by default for all traps.