Types Of Classifications For Traffic For Qos - NEC Univerge SV9100 Manual

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used at certain times of the day for data connectivity. This data connectivity is

very light, only 20Kbps or so during most of the day, but does spike to 50Kbps

during certain points of the day. This data is not time sensitive like the voice

data, so if necessary it could be forced to wait.

Therefore, the user can implement a Quality of Service mechanism on the IP

network. At its most basic form, this denotes certain IP packets as being more

important than others. So they would tell this 64Kbps line that IP packets with

voice deserve a higher priority than those without voice. This allows the network

devices to give priority to the other data, so the quality of the call is not

compromised.

Types of Classifications for Traffic for QoS

Classification uses information from a packet (or frame) to define the type of data

and therefore how the data should be handled for QoS on the network. Using

packet classification, you can partition network traffic into multiple priority levels or

Types of Service (ToS). UNIVERGE SV9100 supports methods of marking a

packet with its classification information in the Layer 2 or 3 headers.

VLAN (802.1Q):

Virtual LANs work at Layer 2 of the OSI model and can be equated to a

broadcast domain. More specifically, VLANs can be seen as a group of end

stations, perhaps on multiple physical LAN segments that are not constrained

by their physical location and therefore, communicate as if they were on a

common LAN. Packets can be marked as important by using layer 2 classes of

service (CoS) settings in the User Priority bits of the 802.1Pq header. Refer to

84-09 : VLAN Setup on page 5-30

configuration.

Figure 5-1 Layer 2 Diagram (802.1Q)

Three bits used for CoS

(user priority)

for information for VLAN

Network Design Considerations