Qos And Queues - Avaya 8800 Planning And Engineering, Network Design

Table 33: Traffic categories and ADSSC mappings
Traffic category
Network Control
Real-Time, Delay Intolerant
Real-Time, Delay Tolerant
NonReal-Time
Mission Critical
NonReal Time, NonMission Critical
You can select the ADSSC for a given device (or a group of devices) and then the network maps the
traffic to the appropriate QoS level, marks the DSCP accordingly, sets the 802.1p bits, and sends
the traffic to the appropriate egress queue.

QoS and queues

Egress priority and discard priority are used in egress queue traffic management. Egress priority
defines the urgency of the traffic, and discard priority defines the importance of the traffic. A packet
with high egress priority should be serviced first. Under congestion, apacket with high discard
priority is discarded last.
In a communications network, delay-sensitive traffic, such as voice and video, should be classified
as high egress priority. Traffic that is sensitive to packet loss, such as financial information, should
be classified as high discard priority. The egress priority and discard priority are commonly referred
to as latency and drop precedence, respectively.
Each port on the Avaya Ethernet Routing Switch 8800/8600 has eight (or 64, depending on the
module) egress queues. Each queue is associated with an egress priority. Some queues are
designated as Strict Priority queues, which means that they are guaranteed service, and some are
designated as Weighted Round Robin (WRR) queues. WRR queues are serviced according to their
queue weight after strict priority traffic is serviced.
For more information about queue numbering and priority levels, see Avaya Ethernet Routing
Switch 8800/8600 Configuration — QoS and IP Filtering for R and RS Modules, NN46205-507.
June 2016
Application example
Alarms and heartbeats
Routing table updates
IP telephony, interhuman
communication
Video conferencing, interhuman
communication.
Audio and video on demand, human-
host communication
Interactive eBusiness (B2B, B2C) transaction
processing
NonInteractive Email, store and forward
FTP, best effort
PointCast; Background/standby
Planning and Engineering — Network Design
Comments on this document? infodev@avaya.com
QoS mechanisms
ADSSC
Critical
Network
Premium
Platinum
Gold
Silver
Bronze
Standard
Custom/ best effort
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