Automatic Recovery Of Cluster Configuration - Cisco 3750G - Catalyst Integrated Wireless LAN Controller Configuration Manual

Planning a Switch Cluster
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Figure 6-7
Management

Automatic Recovery of Cluster Configuration

The active cluster command switch continually forwards cluster-configuration information (but not
device-configuration information) to the standby cluster command switch. This ensures that the standby
cluster command switch can take over the cluster immediately after the active cluster command switch
fails.
Catalyst 3750 Switch Software Configuration Guide
6-12
All standby-group members must be members of the cluster.
There is no limit to the number of switches that you can assign as standby cluster command
Note
switches. However, the total number of switches in the cluster—which would include the
active cluster command switch, standby-group members, and cluster member
switches—cannot be more than 16.
Each standby-group member
the same VLAN. In this example, the cluster command switch and standby cluster command
switches are Catalyst 2970, Catalyst 3550, Catalyst 3560, or Catalyst 3750 cluster command
switches. Each standby-group member must also be redundantly connected to each other through at
least one VLAN in common with the switch cluster.
Catalyst 1900, Catalyst 2820, Catalyst 2900 XL, Catalyst 2950, and Catalyst 3500 XL cluster
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:
"Discovery Through Different VLANs" section on page 6-7
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"Discovery Through Different Management VLANs" section on page 6-7
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VLAN Connectivity between Standby-Group Members and Cluster Members
Command
device
VLANs 9,16
VLAN 9
VLAN 9
VLAN 9
(Figure 6-7) must be connected to the cluster command switch through
Passive
command device
VLANs 9,16
Management
VLAN 16
Member devices
Chapter 6 Clustering Switches
Standby
command device
Management
VLAN 16
VLAN 16
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