LLDP

Link Layer Discovery Protocol is a Layer 2 neighbor discovery protocol that allows devices to advertise device information to their directly connected peers/neighbors.
It is an open standard which provides similar information to CDP
Sends advertisements every 30 seconds when enabled on an interface
- config# lldp timer <seconds>
The LLDP Reinitialization timer is set to 2 seconds by default
LLDP Hold Time (how long the switch will wait before discarding the information) by default is 120 seconds
- config# lldp holdtime <seconds>
You can see the LLDP advertisement and hold time with show lldp

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