CDP - Cisco Discovery Protocol is a Cisco proprietary Layer 2 protocol.
CDP uses a multicast packet to the common destination address 01-00-0c-cc-cc.
CDP packets are sent out with a non zero TTL after an interface is enabled and with a zero TTL value
CDP packets will never be forwarded beyond the directly connected devices. To find CDP information
CDP uses a multicast packet to the common destination address 01-00-0c-cc-cc.
CDP packets are sent out with a non zero TTL after an interface is enabled and with a zero TTL value
immediately before and interface is made idle. This enables the neighboring devices to quickly discover the
state of neighbors.
CDP packets will never be forwarded beyond the directly connected devices. To find CDP information
on indirectly connected routers, administrators can 'telnet' to the intended destination device and run CDP
command.
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