Qos Examples And Recommendations; Bridged Traffic - Avaya 8800 Planning And Engineering

average-peak utilization does not exceed 80%. The network is expected to handle momentary
peaks above 100% capacity, as mentioned previously.

QoS examples and recommendations

The sections that follow present QoS network scenarios for bridged and routed traffic over the
core network.

Bridged traffic

When you bridge traffic over the core network, you keep customer VLANs separate (similar
to a Virtual Private Network). Normally, a service provider implements VLAN bridging (Layer
2) and no routing. In this case, the 802.1p-bit marking determines the QoS level assigned to
each packet. When DiffServ is active on core ports, the level of service received is based on
the highest of the DiffServ or 802.1p settings.
The following cases describe sample QoS design guidelines you can use to provide and
maintain high service quality in an Avaya Ethernet Routing Switch 8800/8600 network.
Bridged trusted traffic
When you set the port to core, you assume that, for all incoming traffic, the QoS setting is
properly marked. All core switch ports simply read and forward packets; they are not re-
marked or reclassifiied. All initial QoS markings are performed at the customer device or on
the edge devices.
The following figure describes the actions performed on three different bridged traffic flows
(that is VoIP, video conference, and e-mail) at access and core ports throughout the network.
Planning and Engineering — Network Design
QoS examples and recommendations
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