Time-To-Live For Transmitted Information; Trap Notifications - Lenovo RackSwitch G8264 Application Manual

Time-to-Live for Transmitted Information

Trap Notifications

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G8264 Application Guide for ENOS 8.4
The transmitted LLDP information is held by remote systems for a limited time. A
time‐to‐live parameter allows the switch to determine how long the transmitted
data is held before it expires. The hold time is configured as a multiple of the
configured transmission interval.
RS G8264(config)# lldp holdtime­multiplier <multiplier>
where multiplier is a value between 2 and 10. The default value is 4, meaning that
remote systems will hold the port's LLDP information for 4 x the 30‐second
msgtxint value, or 120 seconds, before removing it from their MIB.
If SNMP is enabled on the G8264 (see "Using Simple Network Management
Protocol" on page 43), each port can be configured to send SNMP trap notifications
whenever LLDP transmissions are sent. By default, trap notification is disabled for
each port. The trap notification state can be changed using the following
commands (Interface Port mode):
RS G8264(config)# interface port 1
RS G8264(config­if)# [no] lldp trap­notification
RS G8264(config­if)# exit
In addition to sending LLDP information at scheduled intervals, LLDP
information is also sent when the G8264 detects relevant changes to its
configuration or status (such as when ports are enabled or disabled). To prevent
the G8264 from sending multiple trap notifications in rapid succession when port
status is in flux, a global trap delay timer can be configured.
The trap delay timer represents the minimum time permitted between successive
trap notifications on any port. Any interval‐driven or change‐driven trap notices
from the port will be consolidated until the configured trap delay expires.
The minimum trap notification interval can be configured using the following
command:
RS G8264(config)# lldp trap­notification­interval <interval>
where interval is the minimum number of seconds permitted between successive
LLDP transmissions on any port. The range is 1 to 3600. The default is 5 seconds.
If SNMP trap notification is enabled, the notification messages can also appear in
the system log. This is enabled by default. To change whether the SNMP trap
notifications for LLDP events appear in the system log, use the following
command:
RS G8264(config)# [no] logging log lldp