Specifications

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Catalyst 2970 Switch Software Configuration Guide
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Chapter 5 Clustering Switches
Planning a Switch Cluster
Discovery Through Different VLANs
If the cluster command switch is a Catalyst 2970, Catalyst 3550, or Catalyst 3750 switch, the cluster can
have cluster member switches in different VLANs. As cluster member switches, they must be connected
through at least one VLAN in common with the cluster command switch. The cluster command switch
in Figure 5-3 has ports assigned to VLANs 9, 16, and 62 and therefore discovers the switches in those
VLANs. It does not discover the switch in VLAN 50. It also does not discover the switch in VLAN 16
in the first column because the cluster command switch has no VLAN connectivity to it.
Catalyst 2900 XL, Catalyst 2950, and Catalyst 3500 XL cluster member switches must be connected to
the cluster command switch through their management VLAN. For information about discovery through
management VLANs, the “Discovery Through Different Management VLANs” section on page 5-8. For
more information about VLANs, see Chapter 11, “Configuring VLANs.”
Figure 5-3 Discovery Through Different VLANs
Si
Si
VLAN 62
VLAN 62
VLAN 16
VLAN trunk 9,16
Command switch
VLAN 50
VLAN trunk 9,16
VLAN trunk 4,16
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