Allied Telesis AT-S39 - Manual (Page 126)

Section II: Local and Telnet Management
126
There is one other thing that should be mentioned about ingress
filtering and tagged packets, and that is the priority tag. Each tagged
frame has a priority tag in it that instructs the switch as to the
importance of the frame. Frames with a high priority are handled ahead
of frames with a low priority.
Activating or deactivating ingress filtering has no effect on the switch’s
handling of priority tags. A switch will always examine a priority tag in a
tagged frame, regardless of the status of ingress filtering.
In most cases, you will probably want to leave ingress filtering activated
on the switch, which is the default. You can enable or disable ingress
filtering on a per switch basis. You cannot set this per port.
To enable or disable ingress filtering, perform the following procedure:
1. From the Main Menu, type 2 to select VLAN Menu.
2. From the VLAN Menu, type 1 to select Virtual LAN Support.
The Virtual LAN Support menu in Figure 35 on page 123 is displayed
3. From the Virtual LAN Support menu, type 2 to select Enable/Disable
Ingress Filtering.
4. The Ingress Filtering window in Figure 37 is displayed.
Figure 37 Ingress Filtering Window
5. Type E to activate ingress filtering or D to disable the feature on the
switch.
A change to the status of ingress filtering is immediately activated on
the switch.
Allied Telesyn AT-8024 Ethernet Switch
VLAN Support
** Ingress Filtering is Globally Enabled **
E - Enable Ingress Filtering Globally
D - Disable Ingress Filtering Globally
R - Return to Previous Menu
Enter your selection: