Specifying A Single Trap Source; Setting The Snmp Trap Holddown Time - Dell PowerConnect B-RX Configuration Manual

The port <value> parameter specifies the UDP port that will be used to receive traps. This
parameter allows you to configure several trap receivers in a system. With this parameter, IronView
Network Manager and another network management application can coexist in the same system.
The device can be configured to send copies of traps to more than one network management
application.

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 routing 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 it sends.
Identifying a single source IP address for SNMP traps provides the following benefits:
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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 ethernet 4/11
BigIron RX(config)# write memory
Syntax: snmp-server trap-source 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.
BigIron RX Series Configuration Guide
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If your trap receiver is configured to accept traps only from specific links or IP addresses, you
can 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.
Configuring Simple Network Management Protocol traps
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