EXFO FTB-860, Руководство пользователя, Страница: 302 / 409

Common Test Setup, Results, and Functions
290
FTB-860/880
Interface - Network
VLAN
The FTB-860 supports up to 2 stacked layers of VLAN. VLAN allows users to
configure the layers:
ID
,
Priority
,
Type
, and
Drop Eligible
.

Select the number of VLAN layers. Choices are None , 1 , and 2 layers.
VLAN #1 (C-VLAN) and VLAN #2 (S-VLAN)
For each layer, set the following parameters:

VLAN ID: Enter the VLAN ID . The accepted range is from 0 to 4095 .
The value
4095
is reserved while
0
and
1
have specific utility. For more
details, see VLAN on page 379. The default value is 2 .

Priority:
Select the VLAN
Priority
. The accepted range is from
0
to
7
.
The default setting is 0 (low priority).

Type:
Select the VLAN
Type
. The choices for VLAN Ethernet type are
8100 , 88A8 , 9100 , 9200 , and 9300 . The default setting is 8100 for VLAN
#1
and
88A8
for
VLAN #2
.

Drop Eligible allows the Service VLAN tag (S-TAG) to convey eight
distinct priorities, each with a drop eligible indication. When enabled
(DEI = 1), the drop eligible parameter is encoded in the DEI of
transmitted frames. The drop eligible parameter should be enabled for
a received frame if the DEI is set in the S-TAG or if the Priority Code
Point Decoding Table indicates drop eligible enabled for the received
PCP value. When disabled (DEI=0), the DEI is ignored on receipt. Drop
Eligible is not available when VLAN
Type
is
8100
. This setting is
disabled by default.