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Cisco EtherSwitch Service Modules Feature Guide
Information About the Cisco EtherSwitch Service Modules
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Cisco IOS Release 12.2(25)SEC
Discovery of Candidates and Members Through Different VLANs
If the cluster command switch is a Cisco EtherSwitch service module, 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 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.
Note For additional considerations about VLANs in switch stacks, see the “Switch Clusters and Switch
Stacks” section on page 31.
Figure 3 Discovery Through Different VLANs
Discovery of Candidates and Members Through Different Management VLANs
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 Cisco EtherSwitch service module, Catalyst 3750 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 4 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
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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