Configuring Cdp For Extended Discovery; Managing The Arp Table - Cisco Catalyst 2950 Software Manual

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
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
Catalyst 5000 series
support clustering)
Beginning in privileged EXEC mode, follow these steps to configure the number of hops that CDP uses
to discover candidate switches and cluster members.
Command
Step 1
configure terminal
Step 2
cluster discovery hop-count
number
Step 3
end
Step 4 show running-config
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 2950 Desktop Switch Software Configuration Guide
6-14
Figure 6-4. Figure 6-4
Discovering Cluster Candidates through CDP
Undisclosed
device displays
as edge device
(CDP device
that does not
also shows the command switch connected to a Catalyst 5000
Cluster command switch
3 hops from
command switch
Purpose
Enter global configuration mode.
Enter the number of hops that you want CDP to search for cluster
candidates and cluster members.
Return to privileged EXEC mode.
Verify the change by displaying the running configuration file. The
hop count is displayed in the file.
Chapter 6 Configuring the System
Up to 7 hops
from command switch
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