In the last years, many vendors of network devices made available in the market equipments with interesting prices and quality that ended transforming the network environment of companies on a scenario that share different models and devices. Despite the fact that there is a seducing cost, unfortunately some property protocols (despite being interesting) create a barrier of integration among many services or replacement of Switches, Routers,etc.
In order to mapping and discovering neighbor devices in a network with controlled environment and with IP telephony, the Cisco suggest the CDP utilization, but unfortunately the protocol is property of Cisco, limiting its utilization with other models and equipment.
The LLDP protocol is an open standard to discovery devices that are neighbors, with similarly as CDP, including the utilization of features for the VLAN voice.
With the tests below, we activate the LLDP in a Cisco 3750 Switch and a HPN 12500 Switch.
Cisco3750(config)# lldp run
!Run LLDP on Cisco Switch
[HPN12K] lldp enable
! Run LLDP on HP Comware-based Switch
To visualize the mapping of neighbors with Cisco we can use:
Cisco3750#show lldp neighbors
(R) Router, (B) Bridge, (T) Telephone, (C) DOCSIS Cable Device
(W) WLAN Access Point, (P) Continue reading