Airlive L3POE-2TX2406 handleiding
Handleiding
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to queue overflow is the most common situation.
All messages in a traditional IP network are treated equally. Every network device
processes the messages on a FIFO basis, and makes every effort to transmit them to
destinations without guaranteeing reliability, transfer delay, or other performance.
Network service quality is constantly improved as new applications keep springing
up in the rapidly changing IP network. For example, VoIP, video and other delay-sensitive
services have set higher standards on message transmission delay. Message transmission
in a short period has been the common trend. In order to support voice, video and data
services with different requirements, the network needs to identify business types and
provide corresponding services.
The ability to distinguish business types is the prerequisite to provide corresponding
services, so the traditional best-effort service no longer meets the application needs.
Therefore, QoS comes into being. It regulates the network flow to avoid and handle
network congestion and reduce packet loss rate. Meanwhile, users can enjoy dedicated
bandwidths while business can improve service quality, thus perfecting the network
service capacity.
QoS priorities vary with message types. For instance, the VLAN message uses 802.1p,
also known as the CoS (Class of Service) field, while the IP message uses DSCP. To
maintain the priority, these fields need to be mapped at the gateway connected with
various networks when messages flow through the network.
802.1p priority in the VLAN frame header
Typically, VLAN frames are interacted between Layer 2 devices. The PRI field (i.e.
802.1p priority), or CoS field, in the VLAN frame header identifies the quality of service
requirements according to the definitions in IEEE 802.1Q.
802.1p priority in the VLAN frame
The 802.1Q header contains 3-bit PRI fields. PRI field defines 8 CoS of business
priority ranging from 7 to 0 from high to low.
IP Precedence/DSCP Field
According to RFC791 definition, ToS (Type of Service) domain in the IP message
header is composed of 8 bits. Among them, the 3-bit long Precedence field, as located
in the following, identifies the IP message priority.
IP Precedence/DSCP Field
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Productinformatie
| Merk | Airlive |
| Model | L3POE-2TX2406 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 29975 MB |
