_Cisco _Discovery _Protocol is a Cisco proprietary protocol for neighbor
discovery. It transmits a Layer-2 Multicast out of all enable interfaces at
regular intervals. These multicasts contain (among other things) an
interface list, Layer 3 addresses, and the router hostname. When a router
recieves the CDP multicast, It adds the neighbor to it's CDP table.
CDP cannot enable two devices to route to each other. This functionality is
provided by a routing protocol.
A similar function to the one you are asking about is Proxy ARP. Take a
look at www.cisco.com for more information on Proxy Arp and CDP.
----Original Message Follows----
From: "Scoles, Damian" <[EMAIL PROTECTED]>
Reply-To: "Scoles, Damian" <[EMAIL PROTECTED]>
To: "'[EMAIL PROTECTED]'" <[EMAIL PROTECTED]>
Subject: CDP Confusion
Date: Sat, 23 Sep 2000 19:20:03 -0500
I am trying to figure out exactly what CDP does. IF I understand it
correctly it simply finds fellow cisco devices on the network (switches,
routers). What I am confused about is that I read somewhere that it can
pick up the layer 3 (or was it layer 2?) address on interface cards on the
devices it discovers. If this is true and 2 routers, who are in the same
network, discover each other, could they route packets to each other without
a routing process installed? Thanks.
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