What is the DSCP value for video?
Configuration guidelines
| Service class | DSCP Name | DSCP Value |
|---|---|---|
| Broadcast video | CS3 | 24 |
| Low-latency data | AF21, AF22, AF23 | 18, 20, 22 |
| OAM | CS2 | 16 |
| High-throughput data | AF11, AF12, AF13 | 10, 12, 14 |
What is EF in DSCP?
Cisco IP Phones mark signaling packets (SCCP or SIP) to CS3 (24), while media (RTP) is marked to EF (DSCP 46) by default. The priority queue guarantees three critical services: • Packet Loss • Delay • Jitter (delay variation) The three most significant bits of 101 are only considered if IP Precedence was being used.
How do you prioritize zoom traffic?
To prioritise Zoom traffic with Quality of Service, it needs to be prioritised with App QoS. Go to [Bandwidth Management] > [App QoS] and select the Enable option. Select the “Traceable” tab and check that your App QoS menu looks the same as this image, with options for “Instant Messaging” at the top.
Does Zoom use DSCP?
The default Zoom DSCP marking values are 56 for audio, 40 for video, and 40 for screen sharing. You can update audio and video values to allow a network administrator to adjust the priority for Zoom traffic on their network. Note: DSCP markings only apply to Zoom meetings.
What is the best DSCP value?
Use a DSCP value of 34. Best-effort (BE) traffic Standard traffic, including any traffic not marked with a DSCP number, that should be handled after either of the preceding two queues. This traffic should have a DSCP value of 0, which is the default if no DSCP value is specified.
What are the bandwidth requirements for zoom?
Bandwidth requirements
- 2.0 Mbps up and down for single screen.
- 2.0 Mbps up 4.0 Mbps down for dual screen.
- 2.0 Mbps up 6.0 Mbps down for triple screen.
- For screen sharing only: 150 to 300kbps.
- For audio VoIP: 60 to 80kbps.
What are the TOS and DSCP values for EF?
The ToS byte value for EF is as follows: 128 64 32 16 8 4 2 1 1 0 1 1 1 0 0 0 A DSCP value of 46 results in a ToS byte value of 184. Although you can mark a ping with a ToS value of 184, the ICMP (ping) traffic will probably not be mapped to the proper application class.
What DSCP value should I use for audio and video?
Assured Forwarding (AF): Cisco design guides recommend AF41 (DSCP value 100010) for video. We are not going to get a better advantage if we treat the audio portion of video conference better than the video packets. Therefore, use AF41 as the DSCP value for both voice and video media in a video conference.
Why is voice traffic marked as DSCP 46?
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. Since this is Cisco recommended best practise, Cisco’s most UC apps by default mark the traffic like this.
How do media workloads get their own DSCP value?
Each media workload gets its own unique DSCP value (other services might allow workloads to share a DSCP marking, Teams doesn’t) and a defined and separate port range used for each media type. Other environments might have an existing QoS strategy in place, which will help you determine the priority of network workloads.