Cisco Catalyst 2950 - Discovery through the same Management VLAN

5-7
Catalyst 2950 Desktop Switch Software Configuration Guide
78-11380-03
Chapter 5 Clustering Switches
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, see the “Management VLAN” sectiononpage5-15.
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 “Discovery through Different Management VLANs” sectiononpage5-8).
The command switch in Figure 5-3 has ports assigned to management VLAN 9. It discovers all but these
switches:
• Switches 7 and 10, which are in management VLAN 4
• Switch 9 because automatic discovery does not extend beyond a noncandidate device, which is
switch 7
Figure 5-3 Discovery through the Same Management VLAN
Catalyst 1900,
Catalyst 2820,
Catalyst 2900 XL,
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
65277
Catalyst 2900 XL, 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)