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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
78-11380-10
Chapter 7 Clustering Switches
Planning a Switch Cluster
Discovery through the Same Management VLAN
A Catalyst 2900 XL command switch, a Catalyst 3500 XL command switch, or a non-LRE
Catalyst 2950 command switch running a release earlier than Cisco IOS Release 12.1(9)EA1 must
connect to all cluster members through its management VLAN. The default management VLAN is
VLAN 1. For more information about management VLANs, see the “Management VLAN” section on
page 7-16.
Note You can avoid this limitation by using, whenever possible, a command switch that is a Catalyst 3550
switch, a Catalyst 2955 switch, a Catalyst 2950 LRE switch, a non-LRE Catalyst 2950 command switch
running Cisco IOS Release 12.1(9)EA1 or later, or a Catalyst 2940 switch. These command switches can
manage cluster members even if they belong to different management VLANs. See the “Discovery
through Different Management VLANs” section on page 7-9.
The cluster in Figure 7-4 has a command switch that is a Catalyst 2900 XL switch, a Catalyst 3500 XL
switch, or a non-LRE Catalyst 2950 switch running a release earlier than Cisco IOS Release 12.1(9)EA1
with ports assigned to management VLAN 9. It discovers all but these switches:
• Switches 7 and 10 because their management VLAN (VLAN 4) is different from the
command-switch management VLAN (VLAN 9)
• Switch 9 because automatic discovery does not extend beyond a noncandidate device, which is
switch 7
Figure 7-4 Discovery through the Same Management VLAN
VLAN 9
VLAN trunk 4, 9
VLAN 9
VLAN 9
VLAN 9
VLAN 9
VLAN 9
Standby command switchCommand switch
VLAN 9
Switch 7
(management
VLAN 4)
Switch 9
(management
VLAN 9)
VLAN 4
111415
Switch 3
(management
VLAN 9)
Switch 4
(management
VLAN 9)
Switch 10
(management
VLAN 4)
Switch 8
(management
VLAN 9)
Switch 6
(management
VLAN 9)
Switch 5
(management
VLAN 9)