Cisco Systems NME-16ES-1G manual Discovery of Newly Installed Switches in Clusters, New out-of-box

Cisco EtherSwitch Service Modules Feature Guide

Information About the Cisco EtherSwitch Service Modules

Figure 5 Discovery Through Routed Ports

Command device

VLAN 9

RP

RP

VLAN 62

VLAN

9

VLAN 62

(management VLAN 62)

VLAN 9

Member device 7

VLAN 4

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Discovery of Newly Installed Switches in Clusters

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 (AP) 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.

The cluster command switch in Figure 6 belongs to VLANs 9 and 16. When new cluster-capable switches join the cluster, the following things happen:

•One cluster-capable switch and its access port are assigned to VLAN 9.

•The other cluster-capable switch and its access port are assigned to management VLAN 16.

Figure 6 Discovery of Newly Installed Switches

Command device

VLAN 9	VLAN 16
Device A	Device B
AP	AP
VLAN 9	VLAN 16
New (out-of-box)	New (out-of-box)
candidate device	candidate device

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