Qos; Ieee 802.1D And 802.1Q - Avaya
4600 Series Administrator's Manual

The sample below is intended as an example only; your settings will most likely vary from
the settings shown. This sample assumes specification of a DNS Server, parameters for
the 4630/4630SW Directory application, and a 4620 web browser. See
Options for the 4600 Series IP Telephones, on page
values. You need only specify settings that vary from defaults, although specifying
defaults is harmless.
DNSSRVR="dnsexample.yourco.com"
DIRSRVR="123,123,123,123"
DIRTOPDN="yourco"
WMLHOME="http://support.avaya.com/elmodocs2/avayaip/4620/home.wml"
WEBPROXY="11.11.11.11"

QoS

The 4600 Series IP Telephones support both IEEE 802.1D/Q and DiffServ, and in the future may
support other, possibly proprietary, procedures for implementing Quality of Service. In addition,
other network-based QoS initiatives such as UDP port selection do not require support by the
telephones, but nonetheless can contribute to improved QoS for the entire network.

IEEE 802.1D and 802.1Q

IEEE's 802.1Q standard defines a tag that can be added to voice and data packets. Most of the
information associated with this tag deals with Virtual LAN (VLAN) management, but 3 bits are
reserved for identifying packet priority. These 3 bits allow any one of 8 priorities to be assigned to a
specific packet. As defined in the standard, the 8 priorities are, from highest to lowest:
7: Network management traffic
6: Voice traffic with less than 10ms latency
5: Voice traffic with less than 100ms latency
4: "Controlled-load" traffic (mission-critical data applications)
3: Traffic meriting "extra-effort" by the network for prompt delivery (for example, executives'
e-mail)
2: Reserved for future use
0: Traffic meriting the network's "best-effort" for prompt delivery (the default priority)
1: Background traffic such as bulk data transfers and backups
Priority 0 is a higher priority than Priority 1.
Server Administration
Administering
4-28, for details about specific
4
4
QoS
4-23