Questions tagged [qos]

For questions about Quality Of Service (QoS); all aspects of providing differential service to packets based on TOS, DSCP, or other information.

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43 views

QoS Policy to not overutilize WAN link

I have a configuration on a Cisco C897VA-K9 router that has a built in DSL modem. It has a simple internet connection via VDSL. There is a VPN configured on the device, that connects back to our main ...
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17 views

How to compare two DSCP ? which one of DSCP 28 and 34 (decimal) has more priority?

How to compare two DSCP ? for example which one of DSCP 28 and 34 (decimal) has more priority ?
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1answer
17 views

Traffic flow of tunnel interfaces

I would like to understand traffic flow in a router. In what direction do i need to apply a policy-map in order to affect traffic? Especially regading tunnel interfaces, as traffic both comes and goes ...
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2answers
50 views

Understanding traffic flow on SVIs [closed]

I have a simliar question to this one: Access-Lists and VLAN and understanding traffic flow But my question is concerning service-policies. Have a look at the image above. I triet to make a traffic ...
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1answer
23 views

How to verify the traffic forwarding class in Junos if it is set by firewall filter?

I have a firewall filter below which puts the ICMP traffic to assured-forwarding class if the bandwidth threshold is not exceeded: root@vmx> show configuration firewall filter example | display ...
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21 views

Shaper configuration for Juniper MX480 - MPC3e 3D NG

following secario: A MX480 with MPC3e 3D NG Linecards. I have a new Layer2 Access provider that is providing Layer2 services between 100 and 1000MBit/s. My connection zu this services are a 10GE E-...
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20 views

can't find cbQosCMPostPolicyBitRate64 oid for cisco

i have use snmpwalk go get police Bit Rate Traffic policy-map(QOS) for my cisco ASR1006 but i need a 64bit barbecue my traffic is more of 5000Mbps so 32bit can't handle it . ~# snmpwalk -v2c -c aaa ...
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46 views

Upstream QoS garanteed bandwidth

In the network I'm trying to manage there is a satellite link, the upstream of which is ~ 7 Mbps. In this upstream, I need to allocate 1.5 Mbps of guaranteed bandwidth for one single host, but nothing ...
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16 views

Rate limiting xFTP traffic originating from a Cisco IOS router

We have some routers on marginal cell links that we need to pull files from using TFTP or FTP. During file transfers connections to the router become so slow as to be unusable. Is there a way to rate-...
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25 views

uncorrected snmp Qos value from cisco

hello i have a router cisco 1006 and i create a policy-map with to class policy-map CheckBand-BandPerUsr class BandPerUsr police cir 10000000000 class class-default police cir 10000000000 ...
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1answer
53 views

QoS policy definition - Cisco guidelines vs reality

Currently designing a QoS Policy for a customer (Cat 4500 models), following the business needs, I will work on a 8-class based model definition. Cisco has several guidelines under this perspective, ...
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3answers
2k views

How to find the client who downloads a big file?

today I found out that somebody in our organization utilized our uplink for 100%. We have Cisco WLC 2500 where I could see in application monitoring that 80% traffic of the last 90 sec was a file ...
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1answer
131 views

Cisco 3850: Process responsible for Softbuffers

There is a command to increase the SoftMax Buffers on 3850 switches: qos queue-softmax-multiplier 200 This is done in percent which means i am doubling the amount of softmax buffer. Before, the ...
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40 views

QoS over IPSec Site-to-Site VPN: Concerns and Questions

(For clarification purposes: Kbps = Kilobits per second for bandwidth, KB/s = Kilobytes per second for file / data transfer stuff. I'm using them separately because XG knows KBps but not Kbps - ...
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56 views

How do I set per-IP QoS on my router?

I'd like to limit per-endpoint bandwidth on my network to ~10% of available bandwidth, to avoid a single device from consuming all available bandwidth. But I'm not seeing any way to set up a bucketed ...
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1answer
221 views

What is the difference between Cisco's QoS models and strategies?

I have been reading about QoS and different strategies. From what I understand, Cisco proposes three different models and three different strategies for QoS. For strategies, you can have a 4-class, ...
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2answers
132 views

What is the advantage of Supervised Machine Learning over Deep Packet Inspection in Network Traffic Classification?

As per the definition of Deep Packet Inspection (DPI), it uses signatures for packet filtering. Supervised Machine Learning can help put a label on a packet which does not get identified by Deep ...
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3answers
67 views

High Throughput on BGP Multihomed Network

I've One site connected to my server location via BGP over MPLS and at my server location 2 edge routers cater these WAN links, and are further connected to Servers via switches. Now, Is it possible ...
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23 views

What is the difference between meters and queues in Openflow?

I'm new to OpenFlow and have just started studying Software Defined Networking. I have found a multiple websites mentioning that queues and meters are complementary to each other, and that they should ...
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0answers
68 views

HTTPS QOS and policing [closed]

In our office, everything runs on HTTPS. We have softphones and web-based clients which are high priority. We also have Google search, maps and other low priority websites that should work on best-...
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62 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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1answer
291 views

Cisco qos, service-policy on output interface on 1100 ISR seems ignored

I am trying to configure QoS for a specialty purpose application, and it is the first time I have done QoS. This is on an 1100 ISR with IOS XE 16.09.03. The device is a set of 4 that establish a mesh ...
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1answer
158 views

Unable to see packet drops on tunnels

I have the following topology set on AWS where there are 4 CSR 1000v Routers deployed and Segment Routing enabled in which the Segment Routing Headend is R1 and the destination is R3. I aim to send ...
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1answer
76 views

Packet scheduling in LTE/5G core network components

Scheduling algorithms must be used on the radio side of these technologies in order to map radio sources to incoming/outgoing data packets and satisfy quality of service requirements such as latency ...
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78 views

I'm unable to see packet drops after configuration of QoS policy

I aim to send iperf traffic from Endpoint1(Client) to Endpoint2 (Server) with the following SR path = {R1, R2, R3, R4, R3, R2, R1, R2, and R3}. First of all, the traffic generated by iperf from ...
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59 views

Cisco Catalyst QoS queuing model

How Cisco Hardware queuing model (like 1p7q4t for Cat6800) are related to traffic classes (class-map) ? How assign the X traffic class to Y hardware queue ? Also, if only 6 classes are configured, ...
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1answer
65 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
217 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
145 views

Network Control Packets and QoS

In RFC 4594, titled as "Configuration Guidelines for DiffServ Service Classes", it is suggested that network control packets should be tagged by DSCP 48 (CS6). Protocols like OSPF, EIGRP, ISIS and so ...
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1answer
308 views

Cisco nexus 9396PX TX output discard on 40G interface without link congestion

We have cisco nexus 9396PX with N9K-M12PQ module (12x40G Interface), We have 8x10G L3 LACP bonded connectivity with our ISP and so far so good no issue at all. but recently we migrated that LACP LAg ...
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1answer
437 views

Do unmanaged switches honour QoS priorities set by managed switches?

Details about the devices We have a 24 port NETGEAR managed POE switch that has QoS capabilities. We also have the following unmanaged switches, 24 port Cisco POE, 48 port Cisco, 48 port NETGEAR, and ...
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2answers
676 views

Trust dscp command missing on cisco 3850

We have an incoming QoS configuration on our 2960X switches like this: class-map match-any QOS_GL_TRUST match ip dscp 8 16 24 32 46 class-map match-any QOS_GL_CITRIX match access-group name ...
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1answer
173 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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2answers
119 views

C3PL working order

It is very hard to find information on this topic. I would like to know: If traffic has a hit inside a class-map, is it immediately forwarded or does it get checked against all remaining match ...
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1answer
119 views

Fair-queueing every class within CBWFQ

My question is similar to: What is benefit of using CBWFQ with fair-queue statement Given this policy-map (without class-maps) configuration: policy-map test class DSCP30 bandwidth percent 20 ...
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1answer
229 views

qos inside vpn, possible or not ? I read yes and no

I am wondering if possible to do QOS (or similar action) inside vpn tunnel to a cloud server. the goal is to reserved bandwith for voip traffic. I read that you can with GRE and other people said, ...
3
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1answer
932 views

Cisco QoS SRR Share & Shape impact

I am working on understanding the impact of using shaping and sharing with the SRR scheduler. Given these 2 commands on an interface: switch(config-if)#srr-queue bandwidth share 40 20 30 20 switch(...
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1answer
40 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 ...
4
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1answer
175 views

QoS on 2960X does not seem to have an impact

We have some issues with Dect stations that have a very high requirement in regards of delay. Communication between 2 devices should not exceed 500 microseconds (0.5ms). We decided to test some ...
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1answer
214 views

CISCO Tc Bc and CIR units

Are the units in these formulas correct? Tc (seconds) = Bc (bits) / CIR (bits per second) Tc (milliseconds) = Tc (seconds) * 1000 Bc (bits) = Tc (seconds) * CIR (bits per second) CIR (bits per second)...
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1answer
29 views

Access and uplinks ports QoS Queuing model

On an access switch, does the uplinks egress QoS Queuing model (multiple traffic classes and bandwidth reservation), should be different than the access ports egress Queuing model ? Is there a sense ...
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2answers
127 views

what is the difference between OpenFlow queue and 802.1p

I was reading about queues and I came across OpenFlow Queues and IEEE 802.1p I would like to know what are the main differences between them, and how they treat the traffic. In other words how they ...
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1answer
39 views

Is WRED configured for TCP traffic only?

I am looking out for a practical usage of WRED. After reading/searching I found that it is more suitable for TCP traffic. When the queue is full, all the TCP session at that time will start with slow ...
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2answers
641 views

How to block youtube url on a cisco router

How can i block youtube on a cisco router? I have already used class map as seen below class-map match-any url-block-class match protocol http host "*youtube*" ! policy-map block-class policy-map ...
2
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1answer
686 views

Cisco QoS trust and cos-dscp dscp-cos Mapping behaviors

Regarding our current Cisco QoS implementation, to get a deeper understanding I would have some questions I read this: https://www.cisco.com/c/en/us/support/docs/wireless-mobility/voice-over-wireless-...
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1answer
344 views

QoS color aware and color blindness?

QoS - Color Aware and Color Blind mode. Is color - red, yellow and green is a kind of analogy for violate, exceed and conform traffic rate. If so, whey did they come for the colors here. I mean ...
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2answers
586 views

QoS for OSPF, VOICE and CRITICAL Traffic

I plan to implement the QoS policy below. The target is to garantee bandwidth to VOICE and CRITICAL traffic. It should be 1/3 for Voice and Video, 1/3 for Business Critical traffic, 1/3 for all the ...
5
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1answer
142 views

Cisco ISR - Police & burst

We have a Cisco C2900 ISR here, with the following configured: policy-map XX_4M _IN police rate 4000000 burst 400000 conform-action transmit exceed-action drop The policy-map is applied on an ...
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2answers
60 views

traffic shaping

I need some clarifying on that issue (little bit rusty on that) Assuming I have some limitation on the BW of 1Mb. What will happen then there is incoming traffic of 1.5Mb for 10 sec - some of the ...
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1answer
123 views

How color is encoded in the DS field/ToS IPv4 - QoS?

The RFC 2698 says - "The color is coded in the DS field [RFC2474] of the packet in a PHB specific manner". I am trying to understand how color is encoded like in the IPv4 header - in the TOS field ...

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