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Avaya P550R, P580, P880, and P882 Multiservice Switch User Guide, v5.3.1 -3
80-Series QoS
How Does QoS Work?
The QoS process starts at the point where a frame enters the switch
and ends when the frame exits the switch. This section describes the
QoS process from start to finish.
QoS Process for Ingress Traffic
Process The QoS process for ingress traffic involves the following steps:
1. Identifying the priority, also called class, of the frame or
packet. The switch can identify the priority of the frame or
packet by using one or more of the following criteria:
— The priority of the physical port that the switch received
the frame or packet on
— Cisco ISL tag priority
— 802.1p tag priority (default)
— The source or destination MAC address
— The DiffServ code point
— The IP protocol (assigned by means of an ACL rule)
— The source or destination IP address (assigned by means
of an ACL rule)
— The source or destination TCP or UDP port (assigned by
means of an ACL rule)
For more information on identifying the priority of traffic,
see “Classification of Traffic” on page 7.
High Priority
Data
18SAP, Web, etc. Dependent
upon your business.
Best Effort 0 0 Everything else.
Table 6-137. Examples of Classes of Service
Service
Class
Priority DSCP
Value
Type of Traffic
2 of 2