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Software Configuration Guide—Release 12.2(25)EW
OL-6696-01
Chapter 9 Configuring Switches with Web-based Tools
Clustering Switches
• It has an IP address.
• It has Cisco Discovery Protocol (CDP) version 2 enabled (the default).
• It is using cluster-capable software and has clustering enabled.
• It has HTTP server enabled.
• It has 16 VTY lines.
• It is not a command or cluster member switch of another cluster.
Note If your switch cluster contains a Catalyst 4500 series switch, the cluster command switch must also be
a Catalyst 4500 series switch.
Network Assistant and VTY
Network Assistant uses virtual terminal (VTY) lines to communicate with the cluster command device.
Catalyst 4500 series switches have 5 VTY lines configured by default. Network Assistant can employ
an additional 8 lines. Therefore, you should configure the maximum number of lines (or at least, 8 + 5
= 13) so that Network Assistant can communicate with the switch and not use VTY lines that might be
needed for telnet.
You can configure the Catalyst 4500 series switch to support an appropriate number of VTY lines with
the line vty configuration command. For example, the line vty 6 15 command configures the switch to
include 15 VTY lines.
Note If your existing VTY lines have non-default configurations, you might want to apply those
configurations to the new VTY lines.
Candidate Switch and Cluster Member Switch Characteristics
Candidate switches are cluster-capable switches that have not yet been added to a cluster. Cluster
member switches are switches that have been added to a switch cluster. Although not required, a
candidate or cluster member switch can have its own IP address and password.
To join a cluster, a candidate switch must meet these requirements:
• It is running cluster-capable software and has clustering enabled.
• It has CDP version 2 enabled.
• It has HTTP server enabled.
• It has 16 VTY lines.
• It is not a command or cluster member switch of another cluster.
• It is connected to the cluster command switch through at least one common VLAN.
Catalyst 4500 candidate and cluster member switches must be configured with an SVI on the VLAN
connection to the cluster command switch.
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