What is IP ToS?

What is IP ToS?

The type of service (ToS) field is the second byte of the IPv4 header. Based on these ToS values, a packet would be placed in a prioritized outgoing queue, or take a route with appropriate latency, throughput, or reliability.

What is the correct DSCP value used for voice traffic?

Therefore, use AF41 as the DSCP value for both voice and video media in a video conference. QoS Treatment for VoIP: Packets with EF marking will be given high priority on the network. This marking is suited for voice only traffic and provides a high quality call.

What is DSCP in IP header?

Differentiated Services Code Point (DSCP)—A 6-bit field used to identify the level of service a packet receives in the network. DSCP is a 3-bit expansion of IP precedence with the elimination of the ToS bits. Total Length—Specifies the length of the IP packet that includes the IP header and the user data.

Why does Cisco use DSCP AF-41 for video?

1) Audio – Voice traffic is very sensitive to packet loss, latency. It requires no packet loss and latency of about 150 ms. So it’s a general guideline\\standard from Cisco to mark voice with a dscp 46 or ef, Interactive video 34 or af41, Streaming video as dscp 32 or cs4.

What do the last 3 bits of IP precedence mean?

The last 3 bits (7, 6, 5) are for the first field, labeled “Precedence,” intended to denote the importance or priority of the datagram. The second field, labeled “TOS,” denotes how the network should make tradeoffs between throughput, delay, reliability, and cost.

What’s the difference between CS and Af in DSCP?

CS and AF values have different dscp values. CS4 is 32 the nearest next dscp value is AF41 which is 34 followed by AF42 (36) and AF43 (38). CS is class selector and backwards compatible with ip precedence values. While there are 4 AF values (with each having drop preferences)