HP E4510-48G Command Reference Manual page 1118

Note that:
To enable an interface to generate linkUp/linkDown traps when its state changes, you need to enable
the linkUp/linkDown trap function on the interface and globally. Use the enable snmp trap updown
command to enable this function on an interface, and use the snmp-agent trap enable [ standard
[ linkdown | linkup ] * ] command to enable this function globally.
Related commands: snmp-agent target-host, snmp-agent trap enable.
Examples
# Enable the sending of linkUp/linkDown SNMP traps on port GigabitEthernet 1/0/1 and use the
community name public.
<Sysname> system-view
[Sysname] snmp-agent trap enable
[Sysname] snmp-agent target-host trap address udp-domain 10.1.1.1 params securityname public
[Sysname] interface GigabitEthernet 1/0/1
[Sysname-GigabitEthernet1/0/1] enable snmp trap updown
snmp-agent
Syntax
snmp-agent
undo snmp-agent
View
System view
Default Level
3: Manage level
Parameters
None
Description
Use the snmp-agent command to enable SNMP agent.
Use the undo snmp-agent command to disable SNMP agent.
By default, SNMP agent is disabled.
You can enable SNMP agent through any commands that begin with snmp-agent.
Examples
# Enable SNMP agent on the device.
<Sysname> system-view
[Sysname] snmp-agent
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