Foundry Configuration Guide for the FESX, FSX, and FWSX
3 - 4 © Foundry Networks, Inc. December 2005
Manager Network Manager and another network management application can coexist in the same system.
Foundry devices 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 Foundry 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 Foundry 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 Foundry 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 Foundry 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:
FESX424 Switch(config)# snmp trap-source ethernet 4
FESX424 Switch(config)# write memory
Syntax: snmp-server trap-source loopback <num> | ethernet [<slotnum>/]<portnum> | ve <num>
The <num> parameter is a loopback interface or virtual interface number.
If you specify an Ethernet por
t, the <p
ortnum> is the port’s number. If you are configuring a chassis device, specify the slot number as well as the port number (<slotnum>/<portnum>).
To specify a loopback interface as the device’s SNMP trap source, enter commands such as the following:
FESX424 Switch(config)# int loopback 1
FESX424 Switch(config-lbif-1)# ip address 10.0.0.1/24
FESX424 Switch(config-lbif-1)# exit
FESX424 Switch(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
Foundry 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 Foundry 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 Foundry 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:
FESX424 Switch(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.
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