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Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide
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Chapter 5 Clustering Switches
Understanding Switch Clusters
Standby Command Switch Characteristics
A Catalyst 2900 XL or Catalyst 3500 XL standby command switch must meet these requirements:
• It is running 12.0(5)XP or later.
• It has an IP address.
• It has CDP version 2 enabled.
• It is connected to the command switch through the command-switch management VLAN.
• It is redundantly connected to the cluster so that connectivity to member switches is maintained.
• It is not a command or member switch of another cluster.
Note • When the command switch is a Catalyst 3550 switch, all standby command switches must be
Catalyst 3550 switches or Catalyst 2950 switches running Cisco IOS Release 12.1(6)EA2 or
later.
• When the command switch is a Catalyst 2950 switch running Cisco IOS Release 12.1(6)EA2 or
later, all standby command switches must be Catalyst 2950 switches running Cisco IOS
Release 12.1(6)EA2 or later.
• When the Catalyst 2950 command switch is running Cisco IOS Release 12.0(5)WC2 or earlier, the
standby command switches can be these switches also running Cisco IOS Release 12.0(5)WC2 or
earlier: Catalyst 2900 XL, Catalyst 2950, and Catalyst 3500 XL switches.
Candidate and Member Switches Characteristics
Candidate switches are cluster-capable switches that have not yet been added to a cluster. Member
switches are switches that have actually been added to a switch cluster. Although not required, a
candidate or member switch can have its own IP address and password (for related considerations, see
the “IP Addresses” section on page 5-13 and “Passwords” section on page 5-14).
To join a cluster, a candidate switch must meet these requirements:
• It is running cluster-capable software.
• It has CDP version 2 enabled.
• It is not a command or member switch of another cluster.
• It is connected to the command switch through the command-switch management VLAN.
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