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Understand the DSCP in IP packets.

Latest reply: Dec 29, 2018 00:45:42 1946 3 10 0 0

Hello everyone! In QoS planning, you can run commands to change the DSCP value of IP packets.

The device schedules packets through queues. This ensures the quality of important services.

Do you know the position of the DSCP in the IP packet?


Figure 1-1 IP Packet Format

163918m7ex99b75kye37by.png


In IP packets, the TOS field is used for QoS marking. In the TOS field, the first six bits are used to mark the DSCP.

This is what I want to talk about/share with you today, thank you!

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yiyi0519
Created Dec 26, 2018 09:05:48

When we deploy the QoS on the IP network, we can use the TOS to mark the user. If we deploy it on the MPLS, we can use the EXP
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user_2915719
Created Dec 27, 2018 08:46:21

It would be good if you can explain the possible value of the Type of Service section.
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yiyi0519
Created Dec 29, 2018 00:45:42

Differentiated services or DiffServ is a computer networking architecture that specifies a simple and scalable mechanism for classifying and managing network traffic and providing quality of service (QoS) on modern IP networks. DiffServ can, for example, be used to provide low-latency to critical network traffic such as voice or streaming media while providing simple best-effort service to non-critical services such as web traffic or file transfers.

DiffServ uses a 6-bit differentiated services code point (DSCP) in the 8-bit differentiated services field (DS field) in the IP header for packet classification purposes. The DS field replaces the outdated IPv4 TOS field.[1]
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