Specifications

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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
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Chapter 7 Clustering Switches
Understanding Switch Clusters
• If the Catalyst 2950 standby command switch is running Release 12.1(9)EA1 or later, it is connected
to other standby switches through its managment VLAN and to all member switches through a
common VLAN.
• If the Catalyst 2950 standby command switch is running a release earlier than Release 12.1(9)EA1,
it is connected to the command switch and to other standby command switches and member switches
through its management VLAN.
Note Catalyst 2950 command switches running Release 12.1(9)EA1 or later can connect to standby command
switches in the management VLAN. Catalyst 2955 command switches running Release 12.1(12c)EA1
or later can connect to standby command switches in the 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 • Standby command switches must meet these requirements:
– When the command switch is a Catalyst 3550 switch, all standby command switches must be
Catalyst 3550 switches.
– When the command switch is a Catalyst 2955 switch running Release 12.1(12c)EA1 or later, all
standby command switches must be Catalyst 2955 switches running Release 12.1(12c)EA1 or
later.
– When the command switch is a Catalyst 2950 switch running Release 12.1(9)EA1 or later, all
standby command switches must be Catalyst 2950 switches running Release 12.1(9)EA1 or
later.
– When the command switch is a Catalyst 2950 switch running Release 12.1(6)EA2 or later, all
standby command switches must be Catalyst 2950 switches running Release 12.1(6)EA2 or
later.
– When the command switch is running Release 12.0(5)WC2 or earlier, the standby command
switches can be these switches: Catalyst 2900 XL, Catalyst 2950, and Catalyst 3500 XL
switches.
• We strongly recommend that the command switch and standby command switches are of the same
switch platform.
– If you have a Catalyst 3550 command switch, the standby command switches should be
Catalyst 3550 switches.
– If you have a Catalyst 2955 command switch, the standby command switches should be
Catalyst 2955 switches.
– If you have a Catalyst 2950 command switch, the standby command switches should be
Catalyst 2950 switches.
– If you have a Catalyst 2900 XL or Catalyst 3500 XL command switch, the standby command
switches should be Catalyst 2900 XL and Catalyst 3500 XL switches.