Planet IGS-10020, Руководство пользователя, Страница: 326 / 409

User’s Manual
326

Guest Voice Signaling (conditional)
- for use in network topologies
that require a different policy for the guest voice signaling than for the
guest voice media. This application type should not be advertised if all
the same network policies apply as those advertised in the Guest
Voice application policy.

Softphone Voice
- for use by softphone applications on typical data
centric devices, such as PCs or laptops. This class of endpoints
frequently does not support multiple VLANs, if at all, and are typically
configured to use an 'untagged’ VLAN or a single 'tagged’ data specific
VLAN. When a network policy is defined for use with an 'untagged’
VLAN (see Tagged flag below), then the L2 priority field is ignored and
only the DSCP value has relevance.

Video Conferencing
- for use by dedicated Video Conferencing
equipment and other similar appliances supporting real-time
interactive video/audio services.

Streaming Video
- for use by broadcast or multicast based video
content distribution and other similar applications supporting streaming
video services that require specific network policy treatment. Video
applications relying on TCP with buffering would not be an intended
use of this application type.

Video Signaling (conditional)
- for use in network topologies that
require a separate policy for the video signaling than for the video
media. This application type should not be advertised if all the same
network policies apply as those advertised in the Video Conferencing
application policy.
•
Tag Tag
indicating whether the specified application type is using a 'tagged’ or an
'untagged’ VLAN.

Untagged
indicates that the device is using an untagged frame format
and as such does not include a tag header as defined by IEEE
802.1Q-2003. In this case, both the VLAN ID and the Layer 2 priority
fields are ignored and only the DSCP value has relevance.

Tagged
indicates that the device is using the IEEE 802.1Q tagged
frame format, and that both the VLAN ID and the Layer 2 priority
values are being used, as well as the DSCP value. The tagged format
includes an additional field, known as the tag header. The tagged
frame format also includes priority tagged frames as defined by IEEE
802.1Q-2003.
•
VLAN ID
VLAN identifier (VID) for the port as defined in IEEE 802.1Q-2003
•
L2 Priority
L2 Priority is the Layer 2 priority to be used for the specified application type. L2