Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

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.

2
votes
1answer
29 views

Hierarchical QoS

As I understood, the main difference between H-QoS and QoS is the level of category granularity, in which we could apply different QoS tools and policies. For example in simple QoS, just ...
0
votes
1answer
42 views

DSCP re-marking on Cisco Switch

I've followed the commands in this post: DSCP trust boundary policy-map MARKDOWN class class-default set dscp ef Interface Config: interface gig 0/1 service-policy input MARKDOWN The ...
3
votes
1answer
34 views

Is Cisco SG300-10PP & QoS appropriate to share bandwidth?

We're going to let some empty space in our office building soon. The potential client needs an internet connection for their systems (including VoIP).For ourselves we have a resilient ethernet setup, ...
0
votes
0answers
41 views

Buffer Bloat Issues

I recently reconfigured the network layout from a previous question but still getting a lot of buffer bloat. We're seeing 500ms+ on the download alone and it is affecting VOIP. My first instinct is to ...
0
votes
1answer
42 views

Latency in Network [closed]

My company uses trading application where latency is utmost important. I have few ideas but really dont know how to implement. Like I want to know 1) How can I Prioritize applications by 802.1q tag. ...
1
vote
1answer
230 views

Cisco 3850 Output Drops IOS XE Everest Version 16.6.1

We have a MPLS link connected to our 3850 with voice traffic, our interface have 1Gbps and the link is limited to 200Mbps. Our interface shows output drops, and the client device shows overruns. What ...
2
votes
1answer
221 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 ...
2
votes
1answer
427 views

Default QoS Behavior on Catalyst 3650/3850 Running IOS XE 16.3.6

I am trying to better understand the default queuing behavior on Catalyst 3650/3860 running IOS XE 16.3.6 Denali. Is QoS enabled globally by default? Coming from working with Catalyst 2960X on IOS 15 ...
2
votes
1answer
47 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 ...
1
vote
0answers
39 views

traffic of AF41 marking under interface

I have used port-queue commands most of the time to check traffic status under BE, EF, AF4. But I haven't found command to check for AF41 to AF42 on Huawei VRP or cisco IOS. How can check traffic of ...
2
votes
0answers
46 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 ...
1
vote
0answers
76 views

Simple Token Bucket - Policing - Terms - CIR, CBS

I have gone through token bucket algorithm. However, I am struggling to apply this knowledge into the real devices like CISCO, etc. So, for QoS policing, interface meter. I am trying to understand ...
1
vote
0answers
37 views

QOS - the need for it and verifying it

Just some straightforward questions, hope gurus here can shed some light 1) show int - output queue -> this is the hardware queue (tx-ring) or this is the software queue ? if I see drop, this means ...
1
vote
2answers
58 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 ...
1
vote
0answers
22 views

Policy Map issue on c6848x 15.2(02)SY

I have a problem creating traffic shaping on c6848x. I need to set shaping on output interface to limit and shape traffic to 100 MBs. So far I did this: class-map match-any 100MB-OUT match any ...
0
votes
1answer
47 views

QoS: Configuration failed. deny is not supported

object-group network ip-google 8.8.4.0 255.255.255.0 8.8.8.0 255.255.255.0 8.34.208.0 255.255.240.0 8.35.192.0 255.255.240.0 23.236.48.0 255.255.240.0 23.251.128.0 255....
1
vote
2answers
146 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....
4
votes
2answers
234 views

Cisco QoS algorithm - classification process

Question about the classification process of the Cisco QoS. I understand the concept, but I have some misunderstanding regarding the Cisco QoS algorithm. Am I true with the following reasoning: The ...
4
votes
1answer
195 views

QoS Policing vs Shaping, why policing

Regarding QoS, we have two modes: shaping or policing. The policing drops packets while shaping put the packets in buffer. Shaping seems to be the better solution in a general ways, so, why use ...
5
votes
2answers
183 views

QoS shaper, shapes traffic without dropping packets?

I have a problem with my QoS policy, or I should better say, I have a problem understanding how my policy manages to achieve what ask of it without dropping a packet! Here is the scenario: We have ...
6
votes
3answers
775 views

Is QoS an issue for VOIP calls over the Internet? If not, why not?

I'm trying to decide whether I should buy SIP trunks from my ISP or a 3rd-party. As I understand it, it's important to maintain QoS on an internal network (i.e. prioritize VOIP traffic). Is this not ...
1
vote
2answers
319 views

Can NOT match ACL in an output policy-map

this it my config , access-list 2000 permit ip 8.8.8.0 0.0.0.255 any access-list 2000 permit ip 8.34.208.0 0.0.15.255 any access-list 2000 permit ip 8.35.192.0 0.0.15.255 any access-list 2000 permit ...
1
vote
1answer
54 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.
3
votes
1answer
326 views

Cisco MLS and MQC QoS - trust cos/dscp

A question about Cisco MLS and MQC QoS. I read two things on a Cisco guide: https://www.cisco.com/c/en/us/support/docs/switches/catalyst-3850-series-switches/118629-technote-qos-00.html On the ...
2
votes
1answer
388 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% ...
1
vote
1answer
51 views

Can you vlan tag and assign a priorty (0-7) to SCP traffic

My question is in relation to the file transfer protocol SCP. I have a local time sensitive network built. In time sensitive network you can give priority to traffic by vlan tagging and assigning ...
2
votes
1answer
56 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 ...
0
votes
1answer
85 views

AQM Broadcast Early WTD COUNTERS

The command "show platform qos queue stats gigabitEthernet X" yields the following output on a Catalyst 3850 switch: ... AQM Broadcast Early WTD COUNTERS(In terms of Bytes) ---------------------------...
8
votes
1answer
1k views

Does IP provide QoS or not?

IP provides a best-effort delivery service. I believe this implies, among other things, that it offers no QoS to the users. However, IP has a byte in its headers (ToS in v4 and Trafic Class in v6) ...
1
vote
1answer
265 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 ...
1
vote
1answer
79 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 ...
4
votes
2answers
118 views

Aggressive UDP flows

I am reading about the DBL feature on the Cisco 4500E which protect the buffers from filling up with traffic that is identified as nonadaptive or belligerent flows such as aggressive UDP flows. Since ...
0
votes
0answers
49 views

Monitoring max throughput of tunnel interface

Many of our DMVPN sites have underlying connectivity faster than their routers are capable of pushing through a tunnel. Is there a SNMP trap/query that can be sent/monitored that would allow us to ...
0
votes
1answer
44 views

What kind of QoS do I need? [closed]

I have a small office. There are ~5 PCs connected via cable. There is 1 PC via WiFi, 3 VoIP phones and a bunch of cellphones connected via WiFi. There is a Gigalan switch and a internet connection ...
1
vote
0answers
35 views

Low quality of realtime audio/video calls. Route such traffic through a separate WAN connection?

We have problems with the quality of audio/video calls in our office. We get much better quality using mobile LTE connection than our fiber link. LTE connection always goes HD, but the fiber ...
0
votes
0answers
374 views

Can't apply simple qos policy-map

I am trying to follow a simple example found here: https://edennington.wordpress.com/2013/08/09/simplified-qos-on-3850-with-mqc/ I have followed the guide, only for voice, and get the following: ...
0
votes
1answer
90 views

Cisco IOS XR policy statistics:

My goal is to see if the interface gets more than 2gbps of traffic, just to see if it's true. So I created a policy map with ACL that matches all, and all actions - violate, conform are set to ...
1
vote
3answers
76 views

Traffic Classification

How does the switch or router differentiate between voice and data traffic? What are the parameters used in the different layers to classify this traffic?
2
votes
3answers
103 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,...
2
votes
2answers
345 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 ...
1
vote
1answer
125 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-...
5
votes
1answer
275 views

Traffic marking is not working properly in QoS

Traffic marking is not working properly in QoS. I have a problem with the policy map marking bit. I would like to monitor the traffic that matches the IP precedence bit 4 in Po 50, but from the ...
6
votes
3answers
2k views

Implementing Cisco QoS model to end users

I have implemented the 4-Class QoS Model as described in this earlier post from 2013. This Core configuration is implemented on a Cisco VSS 6509-E setup running software version: Cisco IOS Software, ...
0
votes
0answers
397 views

Replacing Switch - Image query 2960-l with 2960x-fps-l

Thank for any insight 1st up. I am changing out one of my switches both with LanBase, but I must be missing some license or knowledge(most likely). When trying to replicate the config I notice mls ...
1
vote
1answer
336 views

Egress traffic shaping vs. normal output interface queue

When traffic needs to egress from an interface, it is put to an output queue. When a traffic shaper is shaping egress traffic going out of an interface, it puts the traffic in an output queue also. ...
1
vote
2answers
2k 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 ...
1
vote
2answers
497 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 ...
0
votes
1answer
409 views

How to test QoS function in router

Assumer I have a new router device of Cisco with 2 ports ethernet 10/100/1000. As everybody know that QoS based on DSCP field in IPv4 header to have difference policy for difference class. I start ...
1
vote
1answer
204 views

QoS implementation for VoIP network

We are in VoIP business and running RTP/SIP traffic 80% in our network we have other servers also like www and monitoring and operation, our network is very flat and simple also we have very basic ...
2
votes
1answer
325 views

TC & Qdisc Rules with 'Leaf' classes [closed]

I'm trying to determine a class which would be used as default for new IP's on my network, here's my current setup: # Delete qdisc rule tc qdisc del dev br-lan root # Add qdisc rule tc qdisc add dev ...