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4-36 CHAPTER 4: NETWORK CONFIGURATION TASKS
Verify that Automatic IP Subnet-based VLAN Auto-configuration
Activated.
1 Move the PC from the port on the SuperStack II Switch 2700 to another
open port on another SuperStack II 2700 (or another port on the same
2700) The destination device/port must also be assigned to the policy
also. Generate a few pings to an unknown destination so that a
broadcast ARP is generated.
The first few packets must be a broadcast so that the switch can capture
the information about the endstation. Switch 2700 and CoreBuilder 7x00
cannot capture Unicast packets. The ping must be to an unknown
destination so that an ARP broadcast is continuously generated.
A message is displayed that the VLAN move completed successfully.
If the PC’s IP subnet is mapped to VLAN elanxx_x, when the PC is
connected to a switch and it generates a broadcast, the device
automatically configures the port to the VLAN that is mapped to PC’s IP
Subnet address.
2 Open the front panel view of the device and then check the VLAN colors.
The port on the device where the PC is connected is now configured into
the VLAN that its MAC address was mapped to. This VLAN configuration
change may take a few seconds to be reflected in VLAN maps.
Configuring
AutoSelect VLANs on
Ethernet and
FastEthernet based
Networks
Devices such as SuperStack II Switch 1000, 3000, and Desktop Switches,
can be configured to automatically partition their ports into VLANs based
on the MAC addresses of the endstations that are attached to them. The
mode of operation on these devices is called the AutoSelect Mode.
The behavior of devices when configured in the AutoSelect Mode is
similar to policy-based VLAN auto-configuration based on MAC
addresses, although using policies applies only to ATM edge devices.
Non-ATM devices cannot be configured based on policies.
When devices are configured to AutoSelect Mode, an external VLAN
Server must be enabled in the network in order for the devices to query
and retrieve MAC address to VLAN mapping information. This database
can be populated using the VLAN Server Member Table Tool under the