Discovery Of Newly Installed Switches - Cisco Catalyst 2960 Software Configuration Manual

Planning a Switch Cluster
If the switch cluster has a Catalyst 3750 or 2960-S switch or has a switch stack, that switch or switch
Note
stack must be the cluster command switch.
The cluster command switch and standby command switch in
Catalyst 2960, Catalyst 2970, Catalyst 2975, Catalyst 3550, Catalyst 3560, or Catalyst 3750 cluster
command switches) 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:
•
•
Figure 6-4
(management

Discovery of Newly Installed Switches

To join a cluster, the new, out-of-the-box switch must be connected to the cluster through one of its
access ports. An access port carries the traffic of and belongs to only one VLAN. By default, the new
switch and its access ports are assigned to VLAN 1.
When the new switch joins a cluster, its default VLAN changes to the VLAN of the immediately
upstream neighbor. The new switch also configures its access port to belong to the VLAN of the
immediately upstream neighbor.
Catalyst 2960 and 2960-S Switches Software Configuration Guide, Release 15.0(1)SE
6-8
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
Switch 9 because automatic discovery does not extend beyond a noncandidate device, which is
switch 7
Discovery Through Different Management VLANs with a Layer 3 Cluster Command
Switch
Command
device
VLAN 16
Device 3
VLAN 16)
VLAN 16
Device 4
(management
VLAN 16)
Standby command
device
VLAN 9
VLAN 62
Device 5
(management
VLAN 62)
VLAN trunk 4, 62
Device 7
(management
VLAN 4)
VLAN 62
Device 9
(management
VLAN 62)
Chapter 6 Clustering Switches
Figure 6-4 (assuming they are
VLAN 9
Device 6
(management
VLAN 9)
VLAN 9
Device 8
(management
VLAN 9)
VLAN 4
Device 10
(management
VLAN 4)
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