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Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-02
Chapter 6 Clustering Switches
Planning a Switch Cluster
Figure 6-3 Discovery Through Different VLANs
Discovery Through Different Management VLANs
Catalyst 2960, Catalyst 2970, Catalyst 3550, Catalyst 3560, Catalyst 3560-E, Catalyst 3750, or
Catalyst 3750-E cluster command switches can discover and manage cluster member switches in
different VLANs and different management VLANs. As cluster member switches, they must be
connected through at least one VLAN in common with the cluster command switch. They do not need
to be connected to the cluster command switch through their management VLAN. The default
management VLAN is VLAN 1.
Note If the switch cluster has a Catalyst 3750-E switch or switch stack, that switch or switch stack must be
the cluster command switch.
The cluster command switch and standby command switch in Figure 6-4 (assuming they are
Catalyst 2960 Catalyst 2970, Catalyst 3550, Catalyst 3560, Catalyst 3560-E, Catalyst 3750, or
Catalyst 3750-E cluster command switches) have ports assigned to VLANs 9, 16, and 62. The
management VLAN on the cluster command switch is VLAN 9. Each cluster command switch discovers
the switches in the different management VLANs except these:
• Switches 7 and 10 (switches in management VLAN 4) because they are not connected through a
common VLAN (meaning VLANs 62 and 9) with the cluster command switch
• Switch 9 because automatic discovery does not extend beyond a noncandidate device, which is
switch 7
VLAN 62
VLAN 62
VLAN 16
VLAN trunk 9,16
Command device
VLAN 50
VLAN trunk 9,16
VLAN trunk 4,16
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