Avaya C360 - Manual (Page 114)

Avaya C360 Layer 2 Features
114 Installation and Configuration Guide Avaya C360 Multilayer Stackable Switches, version 4.5
Priority
By its nature, network traffic varies greatly over time, so short-term peak loads may exceed the
switch capacity. When this occurs, the switch must buffer frames until there is enough capacity
to forward them to the appropriate ports.
This, however, can interrupt time-sensitive traffic streams, such as Voice and other converged
applications. These packets need to be forwarded with the minimum of delay or buffering. In
other words, they need to be given high priority over other types of network traffic.
Priority determines in which order packets are sent on the network and is a key part of QoS
(Quality of Service). The IEEE standard for priority on Ethernet networks is 802.1p.
The C360 supports four internal priority queues and the classification of packets within the
queues is as follows:
This classification is based either on the packet's original priority tag, or, if the packet arrives at
the port untagged, based on the priority configured for the ingress port (using the set port
level
CLI command).
In cases where the packet was received tagged, this priority tag is retained when the packet is
transmitted through a tagging port.
In cases where the priority is assigned based on the ingress priority of the port, then on an
egress tagging port the packet will tagged according to the ingress port priority value configured
by the set port level CLI command.
MAC Address
The MAC address is a unique 48-bit value associated with any network adapter. MAC
addresses are also known as hardware addresses or physical addresses. They uniquely
identify an adapter on a LAN.
MAC addresses are 12-digit hexadecimal numbers (48 bits in length). By convention, MAC
addresses are usually written in one of the following two formats:
● MM:MM:MM:SS:SS:SS
● MM-MM-MM-SS-SS-SS
Table 29: Packet Tagging to C360 Queue Mapping
Tagging C360 Queue
0, 1 Low
2, 3 Normal
4, 5 High
6, 7 Highest