AudioCodes Media Pack MP-11x, Руководство пользователя

Страница: 139 / 650

Version 6.6 139 MP-11x & MP-124
User's Manual 12. Network
12.4 Configuring Quality of Service
The QoS Settings page is used for configuring the Layer-2 and Layer-3 Quality of Service
(QoS) parameters. Differentiated Services (DiffServ) is an architecture providing different
types or levels of service for IP traffic. DiffServ (according to RFC 2474), prioritizes certain
traffic types based on their priority, thereby, accomplishing a higher-level QoS at the
expense of other traffic types. By prioritizing packets, DiffServ routers can minimize
transmission delays for time-sensitive packets such as VoIP packets.
You can assign different VLAN priorities (IEEE 802.1p) and DiffServ to the supported Class
of Service (CoS):

Network Service class – network control traffic (ICMP, ARP)

Premium Media service class – used for RTP media traffic

Premium Control service class – used for call control (i.e., SIP) traffic

Gold service class – used for streaming applications

Bronze service class – used for OAMP applications
The Layer-2 QoS parameters define the values for the 3 priority bits in the VLAN tag of
frames related to a specific service class (according to the IEEE 802.1p standard). The
Layer-3 QoS parameters define the values of the DiffServ field in the IP Header of the
frames related to a specific service class.
The mapping of an application to its CoS and traffic type is shown in the table below:
Table 12-13: Traffic/Network Types and Priority
Application Traffic / Network Types Class-of-Service (Priority)
Debugging interface Management Bronze
Telnet Management Bronze
DHCP Management Network
Web server (HTTP)
Management Bronze
SNMP GET/SET Management Bronze
Web server (HTTPS) Management Bronze
IPSec IKE Determined by the service Determined by the service
RTP traffic Media Premium media
RTCP traffic Media Premium media
T.38 traffic Media Premium media
SIP Control Premium control
SIP over TLS (SIPS)
Control Premium control
Syslog Management Bronze
ICMP Management Determined by the initiator of the
request
ARP listener Determined by the initiator of the
request Network
SNMP Traps
Management Bronze