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Catalyst 2950 Desktop Switch Software Configuration Guide
78-11380-03
Chapter 6 Configuring the System
Managing the ARP Table
Configuring CDP for Extended Discovery
You can change the default configuration of CDP on the command switch to discover devices up to seven
hops away. See Figure 6-4. Figure 6-4 also shows the command switch connected to a Catalyst 5000
series switch. Although the Catalyst 5000 supports CDP, it does not support clustering, and the
command switch cannot learn about connected candidate switches connected to it, even if they are
running CMS.
Figure 6-4 Discovering Cluster Candidates through CDP
Beginning in privileged EXEC mode, follow these steps to configure the number of hops that CDP uses
to discover candidate switches and cluster members.
Managing the ARP Table
To communicate with a device (over Ethernet, for example), the software first must determine the 48-bit
MAC or the local data link address of that device. The process of determining the local data link address
from an IP address is called address resolution.
Catalyst 5000 series
(CDP device
that does not
support clustering)
Undisclosed
device displays
as edge device
Cluster command switch
3 hops from
command switch
Up to 7 hops
from command switch
33019
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
cluster discovery hop-count
number
Enter the number of hops that you want CDP to search for cluster
candidates and cluster members.
Step 3
end Return to privileged EXEC mode.
Step 4
show running-config Verify the change by displaying the running configuration file. The
hop count is displayed in the file.
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