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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266 views

What transmission service gurantees does Ethernet give?

Higher layer transmission protocols have certain properties. For example, TCP "guarantees" duplicate-free, error-free in-order delivery of packets. UDP does basically provide the same properties as IP,...
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1answer
320 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
462 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
120 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
1k views

Quality of Service: Questions about input and output service policies prioritizing the same traffic

This question/lab was created with Cisco networking hardware. I have asked this question else where with no responses. I am new to QoS, but I have spent the last few days researching and I've ...
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2answers
478 views

Match DSCP in IPv4/IPv6 packets is not supported for this interface

i have cisco asr 903 (ios xe) i need to limitation Traffic for google-traffic this my configuration 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....
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1answer
783 views

MLS QoS to MQC conversion

Currently trying to convert MLS QoS to MQC QoS, I'm facing a problem. In MLS (3750), and auto QoS we have this configuration for INPUT QUEUES: mls qos srr-queue input bandwidth 90 10 So in input 90% ...
2
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1answer
156 views

PTP traffic over 100Mbps switch with high volume traffic

Wondering if anyone has ran PTP traffic along side high volume UDP traffic on the same switch running at 100 Mbps. Would it be expected to get massive (15 us) jitter on the PTP packets without setting ...
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2answers
2k views

QoS on an HP 6125 XLG switch running Comware 7

I'm having great difficulty transferring a QoS configuration from a Procurve HP switch to an HP switch running Comware v7. The documentation lists all available configuration parameters, but fails to ...
2
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1answer
314 views

Cisco: Can (and should) I monitor the processing and memory load of QoS on a router?

In the lab I have some 7206VXRs (and 7301s, but lets concentrate on 7206 for now) which are acting as PE routers. I wish to test some basic QoS policies on these for customer facing VoIP services. On ...
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2answers
440 views

QOS Layer 2 Link

I have two NET APP Controllers in two different Data Centers. The Data Centers are connected with a 1 Gig Layer 2 connection. Both NET App controllers are IPed within the same broadcast domain. The ...
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1answer
42 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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1answer
726 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
522 views

QOS police vs bandwidth - is this configuration wrong?

I understand bandwidth in QOS is use to guarantee a minimum bandwidth I understand police in QOS is to set a limit to the maximum bandwidth. class test_out police **1608000** 50000 100000 conform-...
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1answer
73 views

HP 6120X Blade switch QoS

I just got access of blade center and i was looking at configuration of switch which is following. I can see switch has already QoS configured, I am not very expert in QoS so trying to understand ...
2
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1answer
86 views

Qos implementation

I want to implement Qos on a GRE tunnel and want to give priority to a destination IP 1.1.1.1 of a system from our site using WAN link. I will match the traffic through an ACL in class-map in which ...
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1answer
2k views

Cisco QoS - Default Class Allocation

I'm running new IOS 15.4.3(M2) on 2911 and 15.4.3(S3) on ISR4331s. I have the following QoS policy: policy-map WAN-EGRESS-POLICY class CLASSIFY-AF41 bandwidth remaining percent 25 class ...
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1answer
109 views

Signals wise, how does dropping an ingress packet due to policing look like?

The context of my question is actually another question which is "Why isn't ingress shaping possible?". So yes, I get the whole "you can't affect packets you haven't received yet" idea, but we can't ...
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1answer
2k views

IOS-XR - How to get bandwidth policed on an interface

How can I get in a straight-forward way the bandwidth policed on a certain interface on IOS-XR. In IOS, I execute show policy-map interface Gi1/1.1000 And I get clearly the BW policed on ...
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1answer
598 views

Cisco ME3x00 - QoS for layer 2 trunks

I have some ME3800's running 15.3(3)S which aggregate layer 2 circuits from customers. They all have a similar configuration of an incoming trunk on Gi0/1 and then Gi0/23 & Gi0/24 are layer 3 p-t-...
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1answer
799 views

QoS not matching traffic

My knowledge of QoS on Cisco is new as of yesterday and I have been trying to get a few different configurations on stack exchange that I found to work but the traffic only ever seems to match the ...
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1answer
150 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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1answer
186 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 ...
2
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1answer
106 views

Cisco Unity Connection guest, ESXi host, IP phones, vlan, subnet, ip addresses, qos

I have setup: VLAN 1 and subnet 192.168.1.0/24 for data VLAN 100 and subnet 192.168.100.0/24 for voice IP phones get their IP via DHCP on the subnet 192.168.100.0/24 all other IP devices get their IP ...
2
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2answers
523 views

QoS on Cisco Router to limit link utilisation

I´ve the following setup: ISP-ROUTER+-------+ My-ROUTER +-------+ ... The available bandwidth between ISP-Router and MY-ROUTER is 50Mbps. The Physical link is 1000Mpbs. All above 50Mbps result in ...
2
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1answer
228 views

Offered rate statistic in class-map shown only 0000 bps on interface

I would like to monitor an offered rate on interface using class-map (ACL Match). Config Router#show policy-map interface port-channel 3 Port-channel3 Service-policy input: GGC_ADSL Class-...
2
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1answer
68 views

Is there a way to prioritize/manage WIFI traffic (in the WIFI realm)?

So I have a WIFI/client application which has some specific issues, in that several devices need to absolute priority. Fortunately, i'm able to prevent MOST devices from joining the network, but I ...
2
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1answer
235 views

Rate limit based on VLAN

My ISP company has some PoPs in remote areas, as shown in diagram. It is currently, it's getting all prefixes from Local IX and getting only a default route from the upstream Internet provider. ...
2
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1answer
438 views

QoS in a small network

I have a small engineering network with a Linux router, LAN nodes on the one side of the router, and a WAN link attached to the router. The WAN link is a 16mbit/s wireless channel, while the LAN nodes ...
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0answers
59 views

Service Policy CISCO 7606 not work [closed]

I have bandwidth control in cisco 7606 but the same is not limiting my clients. I checked the settings and did not identify an error. This box is 1 replacement for 1 old 7606 model. Is it necessary to ...
2
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1answer
859 views

Use bandwidth and shape concurrent

I have a question about QoS with multiple classes. In our switch with IOS-XE we use five classes to define QoS. Class 1 is a priority class so configured “priority level 1”. The remaining bandwidth of ...
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0answers
227 views

How to configure QoS on router? [closed]

I want to prioritize applications which use the internet but in the QoS I find the applications are IGMP SIP H.323 MGCP SNMP DNS DHCP RIP RSTP RTCP RTP, I don't understand which of them is responsible ...
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0answers
96 views

NDE for QoS Flows on SUP720-3C?

I've setup per user Layer 2 policing on a pair of Cat6k with SUP720-3C to rate-limit wireless guest users. This is working fine and the flow table is populated as expected (with L2 QoS flows). Now my ...
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3answers
537 views

Using QoS for HTTP

By default what DSCP values are used when initiating HTTP traffic? If I wanted to match HTTP traffic to a DSCP value, what should it be?
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1answer
54 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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1answer
247 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
159 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
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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2answers
128 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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2answers
678 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 ...
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1answer
774 views

Jumbo frame on Nexus 5k

I would like to enable the jumbo frame support on my N5k for specific SCSI trafic. I've read we can't do it per interface but only on the system itself : policy-map type network-qos JUMBO_MTU ...
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2answers
206 views

How ISP track the individual subscriber data download and falling back to lower mbps?

I work on software development for routers. So, I am aware of QoS in routers, where we can do scheduling and policing of the traffic. However, one question is still in my mind, is how does the ISP ...
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1answer
42 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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1answer
49 views

I limit the port INGRESS but get packet loss

I use the limit speed method to limit the Juniper Switch port EGRESS and INGRESS speed. but after I added the INGRESS filter to my port, there will loss packets on the switch every port. anybody ...
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2answers
1k views

How do I prevent any one user from hogging all the bandwidth?

We upgraded from 20 Mbps to 50 Mbps DIA about two months ago. This required a router upgrade as well. Since then, anyone who starts a large HTTP download - e.g. an ISO, large spreadsheet or log, movie ...
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2answers
3k views

Why traffic shape/police ingress traffic?

Pardon me for my ignorance. I have not tried QoS nor traffic shaping/policing before. I have been pondering on whether can/why would we want to shape/police ingress traffic if you have no control ...
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2answers
928 views

Ethernet Flow Control vs Quality of Service

What are the trade-offs/major differences of Ethernet Flow Control vs Quality of Service? How to know when to choose one over the other? They seem to both be a solution for congestion. The obvious ...
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1answer
917 views

Problem configuring QoS with FlowVisor and OpenVswitch

I am running a small experiment to isolate bandwidth with flowvisor (version 1.4, version 1.0 of openflow) implementing a port based slicing. With mininet, I create a topology that consists of a host ...
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1answer
46 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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1answer
24 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 ...