Time-To-Live For Transmitted Information; Trap Notifications - IBM RackSwitch G8000 Application Manual

Time-to-Live for Transmitted Information

Trap Notifications

© Copyright IBM Corp. 2011
The minimum transmit interval can be configured using the following command:
RS G8000(config)# lldp transmission-delay <interval>
where interval is the minimum number of seconds permitted between successive
LLDP transmissions on any port. The range is 1 to one-quarter of the scheduled
transmit interval (lldp refresh-interval <value>), up to 8192. The default is 2
seconds.
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 G8000(config)# lldp holdtime-multiplier <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 G8000 (see
Protocol" on page 30), 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 G8000(config)# interface port 1
RS G8000(config-if)# [no] lldp trap-notification
RS G8000(config-if)# exit
In addition to sending LLDP information at scheduled intervals, LLDP information is
also sent when the G8000 detects relevant changes to its configuration or status
(such as when ports are enabled or disabled). To prevent the G8000 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 G8000(config)# lldp trap-notification-interval <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.
"Using Simple Network Management
Chapter 26. Link Layer Discovery Protocol
313