Westermo U200 Installation guide User Manual
Page 27
V4.2
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U/R/T200 series
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end node connected to the same port is able to send and receive packets with these VLAN
ids.
All ports on a switch are by default members of the white VLAN, i.e. the switch management
VLAN. The administrator can remove non-trunk ports from the white VLAN. That means that
such ports cannot be used for switch management. All trunk ports are part of the white VLAN.
This is automatically configured on run-time.
Port 1 has the white VLAN id as the default VLAN is. This is cannot be changed. An end
node that is used for network management (SNMP or IP configuration) must always use the
white VLAN in order to communicate with the switch CPUs. Thus, the switch CPUs can
always be accessed via port 1 with untagged packets, since port 1 has the white VLAN as the
default VLAN.
Press the ‘Set’ button after any changes performed on the VLAN parameters in the VLAN
configuration dialog, while a switch restart is required in case the VLAN tick box is changed
(enable/disable VLAN). I.e. press the ‘Set’ button and then the ‘Reset’ button to restart the
Switch after a change performed on the VLAN tick box
Note 1: all switches in the network should either be enabled or disabled for VLAN. A mix of
switches with and without VLAN support will not provide the user with the capability of tag
removal on all parts of the network.
Note 2: CPU based MAC learning is used instead of switch core MAC learning when VLAN is
enabled. This means that MAC security is also implemented on the switch. E.g. MAC attack
prevention, see the Operator Manual for details. CPU based MAC learning with MAC security
means that packets with new source MAC addresses will not get through the switch before
the new MAC address is authorized by the switch. Thus, N packets with the new MAC
address must be sent before packets with this new MAC address will get through N VLAN
enabled switches. This property has the following practical impact on the IP configuration
tool: the user must type “Scan for switches” a few times before the complete switch list will
appear.