CDP Stand for Cisco
Discovery Protocol, It's a Layer 2 protocol and used to check the availability
of neighbouring Cisco devices. It can give you all the details of the
neighbours. CDP provides network device inventory, connectivity information,
and IP next hop information. CDP Version-2 (CDPv2) is the most recent release
of the protocol and provides more intelligent device tracking features.
Sending CDP packets every 60 seconds and Hold time is 180 seconds.
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