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Questions tagged [dscp]

For questions about DSCP in relation to Quality of Service (QoS). For instance, your switch does not tag your traffic into the correct DSCP value.

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33 views

Applying DSCP to an interface

I'm trying to apply DSCP (AF41) to an interface eth-trunk (if it matters) - [~HUAWEI] diffserv domain QoS \ creating diffserv domain named QoS [~HUAWEI] dsdomain QoS] ip-dscp-outbound af4 ...
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35 views

Prioritizing SSH, Telnet, TACACS in Cisco IOS

For Prioritizing SSH, Telnet, TACACS locally generated traffic on Cisco ASR running IOS XR, we have: ssh server dscp 48 tacacs-server ipv4 dscp 48 Need the same for cisco GSR: 12416/PRP running IOS. ...
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1answer
60 views

Suggestion for Weights for Weighted Round Robin

I have looked over the book "End-to-End QoS Network Design" by Tim Szigeti et al. and RFC4594. The RFC proposes 14 Service class: I have a switch with simple QoS features. It has 14 egress queues on ...
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1answer
162 views

STP packets and QoS

Routing protocol packets are IP packets and therfore they could have different DSCP values to have different priorities (which is implemented by QoS policy) during congestion. How about non-IP packets?...
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1answer
91 views

QoS - Add DSCP EF tag with L2 switches?

Here is the topology that I have: Phone => (access port) L2 Switch (trunk) => Router My goal here is to add an EF tag to the packets coming from my phones. Basically, if a packet comes in being in ...
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1answer
30 views

QoS Classification and Drop Rate

Sorry if i sound completely senseless, In CBWFQ, q1) Does WRED only make sense if there is more than 1 dscp marking in a queue ? q2) if traffic_typeA is to be handle with higher priority then ...
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135 views

Changing DSCP values in a Cisco Switch [closed]

We have an endpoint which cannot tag outgoing RTP packets as 46 (EF).... Currently they happily churn out as 0 Can the Cisco switch it is entering, recognise it's RTP traffic and then change the ...
2
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1answer
174 views

Match cos is not supported for this interface in the output direction

I Have ROUTER CISCO ASR 903 ( IOS XE V3.18 ) ip access-list extended ip-google-traffic permit ip 8.8.4.0 0.0.0.255 any permit ip 8.8.8.0 0.0.0.255 any permit ip 8.34.208.0 0.0.15.255 any permit ...
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1answer
161 views

What is Class-based WFQ and LLQ?

Can someone please explain those 2 concepts and rely them to marking, policing and shaping. It is very confusing for me to rely these concepts with each other.
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1answer
85 views

Are there any protocols that DSCP will break?

If you have a router that traffic passes through, and you want to classify different types of traffic using DSCP values, do you need to take special care to avoid setting DSCP values on certain types ...
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1answer
580 views

Fortigate - Routing DSCP tagged packets through different WAN connections

I have 3 WAN connections and a remote site with a single WAN address. What I'd like to do is monitor the latency towards the remote site using a single machine (Opsview) on our LAN but through all 3 ...
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1answer
449 views

How packets get differentiated to prioritize?

On the Internet, there are many types of packets: VoIP, Audio, Video. As QoS is used to prioritize packets based on DSCP or VLAN priority. who set these bits for each and every packet. Like Audio gets ...
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1answer
357 views

QOS on Nortel Devices

I need to set up the following on Several Nortel Baystack's (5530/5520): "Assign a priority to DXL VoIP traffic with a DSCP priority level which will be co-exist with the rest of the real-time ...
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0answers
723 views

DSCP to p bit mapping in Linux [closed]

Re posting from Unix forum as it may be appropriate for networking forum I have the following setup Linux1--------------------------------------------Linux2 eth0 10.10.10.30 ...
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1answer
627 views

QoS DSCP AF Class Comparisons

I'm having trouble wrapping my head around DSCP AF Classes and what--all else being equal--gets dropped first. I understand packets are given a Class, 1-4. The higher the Class number, the higher ...
4
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1answer
566 views

Why doesn't ISPs reset DSCP at the edge before delivering traffic to customers?

Some ISPs are doing QoS based on traffic type (online streaming), such as Comcast and Cogent. Why don't they reset IP DSCP at the edge so it is not as obvious that they are doing some kind of traffic ...
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2answers
5k views

How do I tag traffic with a DSCP value on an ASA?

I have a SIP Server that does not put a DSCP code on it's traffic. This server is behind an ASA, and I want to prioritize its traffic passing through an ASA from the private to public network. I am ...
7
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2answers
875 views

DSCP trust boundary

I have performed some analysis and noticed that traffic coming in from the Internet contains a myriad of DSCP values. This traffic competes for voice and video resources on the internal network. How ...
6
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2answers
6k views

QoS on HP Procurve 2520 and 3800 switches

Do Procurve switches remark cos/dscp values between switches (trust boundaries) as Cisco switches do? I'm wondering if there is an equivalent to "mls qos trust (cos/dscp)" in the HP realm.