Brocade TurboIron 24X Series Configuration Guide - Manual (Page 58)

24 Brocade TurboIron 24X Series Configuration Guide
53-1003053-01
Configuring basic system parameters
Specifying a single trap source
You can specify a single trap source to ensure that all SNMP traps sent by the device use the same
source IP address. When you configure the SNMP source address, you specify the Ethernet port,
loopback interface, or virtual interface that is the source for the traps. The device then uses the
lowest-numbered IP address configured on the port or interface as the source IP address in the
SNMP traps sent by the device.
Identifying a single source IP address for SNMP traps provides the following benefits:
• If your trap receiver is configured to accept traps only from specific links or IP addresses, you
can use this feature to simplify configuration of the trap receiver by configuring the device to
always send the traps from the same link or source address.
• 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.
TurboIron(config)#snmp trap-source ethernet 4
TurboIron(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.
TurboIron(config)#int loopback 1
TurboIron(config-lbif-1)#ip address 10.0.0.1/24
TurboIron(config-lbif-1)#exit
TurboIron(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.