Discovery Through The Same Management Vlan - Cisco WS-C3550-12G Software Configuration Manual

Planning a Switch Cluster

Discovery through the Same Management VLAN

When the cluster has a Catalyst 2900 XL, Catalyst 2950, or Catalyst 3500 XL command switch, all
cluster members must connect to it through the command-switch management VLAN, which is VLAN 1
by default. If the cluster members include Catalyst 3550 switches, these member switches must also be
connected to the command-switch management VLAN. For information about management VLANs on
these switches, refer to the software configuration guide for that specific switch.
To avoid this limitation, assign a Catalyst 3550 switch as the command switch whenever possible. A
Catalyst 3550 command switch can manage these cluster members even if they belong to different
management VLANs (see the
The command switch in
switches:
•
•
Figure 5-4
Catalyst 2900 XL, Catalyst 2950,
or Catalyst 3500 XL command
and standby command switches
Catalyst 2900 XL,
Catalyst 2950, and
Catalyst 3500 XL
Catalyst 3550 Multilayer Switch Software Configuration Guide
5-8
"Discovery through Different Management VLANs" section on page
Figure 5-4
Switches 7 and 10 because their management VLAN (VLAN 4) is different from the
command-switch management VLAN (VLAN 9)
Switch 9 because automatic discovery does not extend beyond a noncandidate device, which is
switch 7
Discovery through the Same Management VLAN
Switch 3
(management
VLAN 9)
Catalyst 1900,
Catalyst 2820,
Switch 4
(management
VLAN 9)
switches
has ports assigned to management VLAN 9. It discovers all but these
Command switch
VLAN 9
VLAN 9
VLAN 9
Switch 5
(management
VLAN 9)
VLAN 9 VLAN trunk 4, 9
Switch 7
(management
VLAN 4)
VLAN 9
Switch 9
(management
VLAN 9)
Chapter 5 Clustering Switches
Standby command switch
VLAN 9
Switch 6
(management
VLAN 9)
VLAN 9
Switch 8
(management
VLAN 9)
VLAN 4
Switch 10
(management
VLAN 4)
5-9).
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