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Catalyst 2940 Switch Software Configuration Guide
78-15507-02
Chapter 5 Clustering Switches
Planning a Switch Cluster
Figure 5-3 Discovery Through the Same Management VLAN
Discovery Through Different Management VLANs
We recommend using a Catalyst 3550 command switch, a Catalyst 2955 command switch, a
Catalyst 2950 command switch running Cisco IOS Release 12.1(9)EA1 or later, or a Catalyst 2940
switch. These command switches can discover and manage member switches in different VLANs and
different management VLANs. Catalyst 3550 member switches, Catalyst 2955 member switches,
Catalyst 2950 member switches running Cisco IOS Release 12.1(9)EA1 or later, and Catalyst 2940
switches must be connected through at least one VLAN in common with the command switch. All other
member switches must be connected to the command switch through their management VLAN.
In contrast, a Catalyst 2900 XL command switch, a Catalyst 2950 command switch running a release
earlier than Cisco IOS Release 12.1(9)EA1, or a Catalyst 3500 XL command switch must connect to all
cluster members through its management VLAN. The default management VLAN is VLAN 1. For
information about discovery through the same management VLAN on these switches, see the “Discovery
Through the Same Management VLAN” section on page 5-5.
The Catalyst 2940 command switch in Figure 5-4 has ports assigned to VLANs 9, 16, and 62. The
management VLAN on the Catalyst 2940 command switch is VLAN 9. Each 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 command switch
• Switch 9 because automatic discovery does not extend beyond a noncandidate device, which is
switch 7
Catalyst 1900,
Catalyst 2820,
Catalyst 2900 XL,
Catalyst 2940,
Catalyst 2950, and
Catalyst 3500 XL
switches
VLAN 9
VLAN trunk 4, 9
VLAN 9
VLAN 9
VLAN 9
VLAN 9
VLAN 9
Standby command switchCommand switch
VLAN 9
Switch 7
(management
VLAN 4)
Switch 9
(management
VLAN 9)
VLAN 4
87799
Catalyst 2900 XL,
Catalyst 2940, Catalyst 2950,
or Catalyst 3500 XL command
and standby command switches
Switch 3
(management
VLAN 9)
Switch 4
(management
VLAN 9)
Switch 10
(management
VLAN 4)
Switch 8
(management
VLAN 9)
Switch 6
(management
VLAN 9)
Switch 5
(management
VLAN 9)