Configuring for Network Management Applications
LLDP (Link-Layer Discovery Protocol)
Data Type
Configuration
Options
Default
Description
System capabilities
Enable/Disable
Enabled
Identifies the primary switch functions that are enabled.
enabled
5, 6
1
The Packet Time-to-Live value is included in LLDP data packets. (Refer to “Changing the Time-to-Live for Transmitted
Advertisements” on page 12-36.)
2
Subelement of the Chassis ID TLV.
3
Subelement of the Port ID TLV.
4
Subelement of the Remote-Management-Address TLV.
5
Subelement of the System Capability TLV.
6
Populated with data captured internally by the switch. For more on these data types, refer to the IEEE P802.1AB Standard.
Remote Management Address.
The switch always includes an IP address
in its LLDP advertisements. This can be either an address selected by a default
process, or an address configured for inclusion in advertisements. Refer to “IP
Address Advertisements” on page 12-31.
Debug Logging.
You can enable LLDP debug logging to a configured debug
destination (Syslog server and/or a terminal device) by executing the
debug
lldp
command. (For more on Debug and Syslog, refer to the Troubleshooting
appendix in the
Management and Configuration Guide
for your switch.)
Note that the switch’s Event Log does not record usual LLDP update messages.
Options for Reading LLDP Information Collected by the
Switch
You can extract LLDP information from the switch to identify adjacent LLDP
devices. Options include:
■
Using the switch’s
show lldp info
command options to display data
collected on adjacent LLDP devices—as well as the local data the
switch is transmitting to adjacent LLDP devices (page 12-32).
■
Using an SNMP application that is designed to query the Neighbors
MIB for LLDP data to use in device discovery and topology mapping.
■
Using the
walkmib
command to display a listing of the LLDP MIB
objects
12-30
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