Avaya 8800 Planning And Engineering, Network Design page 300

QoS design guidelines
The following figure shows what happens inside an Ethernet Routing Switch 8800/8600 core node.
Packets enter through a tagged or untagged core port, and exit through a tagged or untagged core
port.
Figure 152: QoS actions on bridged or routed core ports
Bridged untrusted traffic
When you set the port to access, mark and prioritize traffic on the access node using global filters.
Reclassify the traffic to ensure it complies with the Class of Service specified in the Service Level
Agreement (SLA).
Bridged traffic and RPR interworking
For Resilient Packet Ring (RPR) interworking, you can assume that, for all incoming traffic, the QoS
setting is properly marked by the access nodes. The RPR interworking is done on the core switch
ports that are configured as core/trunk ports. These ports preserve the DSCP marking and re-mark
the 802.1p bit to match the 802.1p bit of the RPR. The following figure shows the actions performed
on three different traffic flows (VoIP, video conference, and e-mail) over an RPR core network.
June 2016 Planning and Engineering — Network Design
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