Lenovo ThinkSystem NE2552E, Application Manual

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© Copyright Lenovo 2018 Chapter 33: Link Layer Discovery Protocol
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Time-to-Live for Transmitted Information
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 should be held before it expires. The hold time is configured as a multiple of
the configured transmission interval.
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.
Trap Notifications
If SNMP is enabled on the NE2552E (see “Using Simple Network Management
Protocol” on page 38 ), 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:
In addition to sending LLDP information at scheduled intervals, LLDP
information is also sent when the NE2552E detects relevant changes to its
configuration or status (such as when ports are enabled or disabled). To prevent
the NE2552E 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:
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
commands:
NE2552E(config)# lldp holdtime-multiplier
<multiplier>
NE2552E(config)# interface port
<x>
NE2552E(config-if)# [no] lldp trap-notification
NE2552E(config-if)# exit
NE2552E(config)# lldp trap-notification-interval
<interval>
NE2552E(config)# [no] logging log lldp