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Catalyst 2950 Desktop Switch Software Configuration Guide
78-14982-01
Chapter 6 Clustering Switches
Planning a Switch Cluster
• All standby-group members must be members of the cluster.
Note There is no limit to the number of switches that you can assign as standby command
switches. However, the total number of switches in the cluster—which would include the
active command switch, standby-group members, and member switches—cannot be more
than 16.
• Each standby-group member (see Figure 6-9) must be connected to the command switch through its
management VLAN. Each standby-group member must also be redundantly connected to each other
through the management VLAN.
Catalyst 1900, Catalyst 2820, Catalyst 2900 XL, Catalyst 2950, and Catalyst 3500 XL member
switches must be connected to the cluster standby group through their management VLANs.
Note Catalyst 2950 standby command switches running Release 12.1(9)EA1 or later can connect to
candidate and member switches in VLANs different from their management VLANs.
For more information about VLANs in switch clusters, see these sections:
–
“Discovery through the Same Management VLAN” section on page 6-8
–
“Discovery through Different Management VLANs” section on page 6-9
Figure 6-9 VLAN Connectivity between Standby-Group Members and Cluster Members
Si
Management
VLAN 16
Catalyst 2900 XL or
Catalyst 3500 XL
switch
Catalyst 3550
multilayer switch
Catalyst 3550 standby
command switch
VLAN 16
VLAN 9
Si Si
VLAN 9
Catalyst 3550 active
command switch
Catalyst 3550 passive
command switch
Member switches
Management
VLAN 9
Catalyst 3550
switch
Catalyst 2950
switch
VLAN 9
VLANs 9,16 VLANs 9,16
Management
VLAN 16
65280
Si