Cisco WS-C2955T-12 Software Manual page 114

Planning a Switch Cluster
All standby-group members must be members of the cluster.
•
Note
Each standby-group member
•
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.
For more information about VLANs in switch clusters, see these sections:
–
–
Figure 5-7
Catalyst 3550
Catalyst 2950
Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide
5-14
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.
"Discovery through the Same Management VLAN" section on page 5-8
"Discovery through Different Management VLANs" section on page 5-9
VLAN Connectivity between Standby-Group Members and Cluster Members
Catalyst 3550 active
command switch
VLANs 9,16
Si
VLAN 9
VLAN 9
switch
Management
VLAN 9
switch
(Figure 5-7) must be connected to the command switch through its
Catalyst 3550 passive
command switch
VLANs 9,16
Si
VLAN 9
Management
VLAN 16
Member switches
Chapter 5 Clustering Switches
Catalyst 3550 standby
command switch
Si
Management
VLAN 16
Catalyst 2900 XL or
Catalyst 3500 XL
switch
VLAN 16
Catalyst 3550
multilayer switch
Si
78-6511-08