342-86400-498PS
Issue 1.2
April 2012
Page 26
Copyright
GE Multilin Inc. 2010-2012
QVLAN Filtering
If an Ethernet frame is 802.1Q tagged, it carries a VLAN identifier (an integer
ranging from 1 to 4094), which defines the frame's membership to an 802.1Q-
based VLAN (i.e. a QVLAN)
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. The ETHER-1000 unit is capable of monitoring
the (outer) QVLAN IDs of the frames ingressing and egressing each of its drop
ports and, if the port's "QVLAN-filtering" feature is enabled, only the frames
whose (outer) QVLAN IDs are on the list of static QVLAN entries for the port will
be processed (not discarded). As a result, any ingressing broadcast and
multicast traffic will be delivered only to those ports that are members of the
same D-PVLAN and QVLAN. A maximum of 50 QVLAN memberships in the
range from 1 to 4000 per can be assigned to a port.
If QVLAN filtering for a port is enabled, it is applied to both ingressing and
egressing frames. All ports on the same D-PVLAN must be set for the same
QVLAN filtering mode (either enabled or disabled).
Note:
QVLAN filtering for the port is enabled or disabled by means of selecting
the proper Port Type option. Ports provisioned as P-Access or P-Trunk ports do
not support QVLAN filtering, while the ports provisioned as Q-Access or Q-Trunk
ports do.
Note
: For ports with QVLAN filtering enabled (Q-Access and Q-Trunk ports), any
ingressing untagged (native) frames and 802.1p frames are either discarded or
assigned the port‟s Default QVLAN ID value, depending on the port setting. At
the far end, these frames may be outputted either unchanged or with an added
tag with the source port‟s Default QVLAN ID value. (See Output Tagging feature
below.)
Output Tagging
The output tagging feature allows for adding or removing the (outer) 802.1Q tags
of the frames egressing the local access port. This feature, in its generic form, is
available only to ports with QVLAN filtering enabled. The frames that were
tagged at the far-end source port can be outputted either unchanged or with the
(outer) tag removed. The frames that were untagged at the far-end source port
can be outputted unchanged, or with an added tag carrying th
e source port‟s
Default QVLAN ID and Default Priority. The default is “no change”. Output
Tagging mode is configured on per-QVLAN basis.
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For more information on VLANs the user is referred to Appendix B.
