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Many kinds of network management software use "Automated Discovery" function to trace the
change and condition of topology, but most of them can reach layer-three and classify the
devices into all IP subnets at best. This kind of data are very primitive, only referring to basic
events like the adding and removing of relative devices instead of details about where and how
these devices operate with the network.
Layer 2 discovery covers information like which devices have which ports, which switches
connect to other devices and so on, it can also display the routs between clients, switches,
routers, application servers and network servers. Such details will be very meaningful for
schedule and investigate the source of network failure.
LLDP will be a very useful management tool, providing accurate information about network
mirroring, flow data and searching network problems.
11.2 LLDP Function Configuration Task Sequence
1. Globally enable LLDP function
2. Configure the port-based LLDP function switch
3. Configure the operating state of port LLDP
4. Configure the intervals of LLDP updating messages
5. Configure the aging time multiplier of LLDP messages
6. Configure the sending delay of updating messages
7. Configure the intervals of sending Trap messages
8. Configure to enable the Trap function of the port
9. Configure the optional information-sending attribute of the port
10. Configure the size of space to store Remote Table of the port
11. Configure the type of operation when the Remote Table of the port is full
12. Display and debug the relative information of LLDP
1. Globally enable LLDP function
Command
Global Mode
lldp enable
lldp disable
Explanation
Globally enable or disable LLDP function.
11-27
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Troubleshooting
