NETGEAR GS752TP User Manual

Configure Quality of Service
145
GS752TP, GS728TP, and GS728TPP Gigabit Smart Switches
Differentiated Services
The QoS feature provides Differentiated Services (DiffServ) support that enables traffic to be
classified into streams and given certain QoS treatment in accordance with defined per-hop
behaviors. For more information, see DiffServ Traffic Classes on page 260.
Standard IP-based networks are designed to provide “best effort” data delivery service. Best
effort service implies that the network delivers the data in a timely fashion, although there is
no guarantee that it will. During times of congestion, packets might be delayed, sent
sporadically
, or dropped. For typical Internet applications, such as email and file transfer, a
slight degradation in service is acceptable and in many cases unnoticeable. Conversely, any
degradation of service has undesirable effects on applications with strict timing requirements,
such as voice or multimedia.
Defining DiffServ
To use DiffServ for QoS, you must first define the following categories and their criteria:
1. Class. Create classes and define class criteria.
2. Policy. Create policies, associate classes with policies, and define policy statements.
3. Service. Add
a
policy to an inbound interface.
Packets are classified and processed based on defined criteria. A class defines the
classification criteria. A policy’
s attributes define the processing. Policy attributes might be
defined on a per-class instance basis, and it is these attributes that are applied when a match
occurs. A policy can contain multiples classes. When the policy is active, the actions taken
depend on which class matches the packet.
Packet processing begins by checking the class match criteria for a packet. A policy is
applied to a packet when a class match within that policy is found.
From the DiffServ menu under the QoS tab, you can access the following:
• Diffserv Configuration
• DSCP Violate Action Mapping
• Class Configuration
• IPv6 Class Configuration
• Policy Configuration
• Service Configuration
• Service Statistics
Diffserv Configuration
Use the Diffserv Configuration screen to display DiffServ general status group information,
which includes the current administrative mode setting as well as the number of used
resources for DiffServ.

NETGEAR GS752TP Specifications

General

Switch type	Managed
Switch layer	L3
Quality of Service (QoS) support	Yes
Number of multicast groups filtered	1024
Fiber optic connector	SFP
SFP module slots quantity	4
Basic switching RJ-45 Ethernet ports type	Gigabit Ethernet (10/100/1000)
Basic switching RJ-45 Ethernet ports quantity	48
10G support	-
Number of VLANs	256
Networking standards	IEEE 802.1D, IEEE 802.1s, IEEE 802.1w, IEEE 802.1x, IEEE 802.3af, IEEE 802.3at, IEEE 802.3x
Copper ethernet cabling technology	1000BASE-T, 100BASE-T, 10BASE-T
DHCP features	DHCP client
MAC address table	8000 entries
Packet buffer memory	8 MB
Number of static routes	32
Supported network protocols	IPv4, IPv6, TFTP, SNTP, TACACS+
Power consumption (typical)	384 W
Safety	CE, CSA, UL
Product color	Gray
Electromagnetic compatibility	CE, FCC, Class A EN 55022, Class A C-Tick, EN 50082-1, EN 55024, CCC
Mean time between failures (MTBF)	220447 h
Heat dissipation	1750.70 BTU/h
Operating altitude	0 - 3000 m
Storage temperature (T-T)	-20 - 70 °C
Operating temperature (T-T)	0 - 55 °C
Storage relative humidity (H-H)	0 - 95 %
Operating relative humidity (H-H)	10 - 90 %
Total Power over Ethernet (PoE) budget	15.4 W
Power over Ethernet plus (PoE+) ports quantity	8
Cables included	AC

Weight and Dimensions

Depth	316 mm
Width	440 mm
Height	43 mm
Weight	5100 g