Lucent Technologies Cajun Switch P220 - Manual (Page 20)

Cajun P220, P550, P550R Switch Release Notes, Release 4.0.1 20
VLAN Issues
NOTE:
If the Switch Port attribute Automatic VLAN Creation is set to Enabled, the
Allow Learning attribute must also be set to Enabled.
Configuring VLANs
NOTES:
• In certain large configurations, the switch powers up very slowly.
• If you set a port’s VLAN trunking mode to Clear, make sure not to change the VLAN
Binding Type from the default value: Static.
• If you are using both the VLAN auto-learning feature and the Binding Type Bind to
Received or Bind to All, make sure that you set the binding type before you set
Auto-learn to enable or else the port may not be automatically added to the VLAN.
Duplicate VLAN Error Message
NOTE:
When you add a VLAN and then refresh your browser page, you may receive an
error message stating that the VLAN name is already in use.
IEEE 802.1Q Packets
Problem: When a tagged IEEE 802.1Q packet arrives on a port that is “bind-to-all” and
the VLAN does not exist on the switch, the packet is forwarded on to the VLAN assigned
to the port default VLAN for that port.
Workaround: To prevent unintended forwarding of unknown VLAN traffic to the port
default VLAN, configure the port default VLAN to the “discard” VLAN. However, please
note that automatic VLAN creation will not work if the port default VLAN is the
“discard” VLAN, because the switch does not learn for this VLAN.