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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61 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 ...
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0answers
58 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 ...
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0answers
53 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 ...
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196 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 ...
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0answers
51 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 ...
2
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1answer
96 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 ...
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0answers
34 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 ...
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1answer
107 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....
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2answers
385 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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2answers
286 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 ...
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1answer
444 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 ...
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2answers
620 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 ...
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3answers
2k 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 ...
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2answers
1k 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 ...
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1answer
169 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
549 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
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1answer
669 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% ...
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1answer
155 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
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1answer
85 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
140 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) ---------------------------...
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1answer
2k 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) ...
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2answers
708 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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1answer
145 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
216 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 ...
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1answer
51 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 ...
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0answers
40 views

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

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 ...
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1answer
162 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 ...
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3answers
95 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?
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3answers
181 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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2answers
482 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
186 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-...
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1answer
436 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 ...
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3answers
5k 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, ...
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1answer
499 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. ...
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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
788 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
632 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 ...
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1answer
270 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 ...
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2answers
572 views

Confirm QoS Cisco 3650

I'm testing some Cisco 3650 switches with Cisco VoIP handsets and using auto qos. Is there a way to see if qos is kicking in and prioritising the voice traffic? Tried looking through the cli and can't ...
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1answer
453 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 ...
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1answer
834 views

Bandwidth regulation without QoS and VLAN [closed]

Does anyone know any possibility to do Bandwidth reservation or something equal to it. Mainly to give VoIP and IPTV Bandwidth before the Internet when there is no possibility to use QoS and VLAN. It ...
2
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2answers
63 views

How did the sender detect the reciver speed?

Let us say we have switch with multiple gigabit interfaces and there is two machines connected to that switch, one with gigabit NIC and one with 100 mbps NIC and we start copying file from the gigabit ...
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1answer
329 views

Cisco IOS: Limiting internet bandwidth usage for specific VLAN

I would like to limit the usage of a 10 MBit internet connection for a specific internal VLAN to 2 MByte (on a Cisco router, IOS 15.3). Is that possible in general? How can the router make sure that ...
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2answers
84 views

What exactly happens in the queues when a congested network applies back pressure ? [closed]

During Congestion in a network switch HW ,for examplewhen a shaping rate to the interface that imposes a speed limit lower than the maximum interface line speed . The concept of back pressure is ...
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2answers
2k views

How does throttling of network traffic work for TCP/IP?

I have tried to find the answer on how network throttling works e.g. by ISP when they limit your access to say 100 Mbps. As far as I know TCP/IP itself does not have any mechanisms for that, so it is ...
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1answer
722 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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0answers
162 views

3com 5500G migration to force10 s4810

I am doing this migration with these 3com switches.So our client told me that the configuration was made for a network administrator who was fired some years ago. So I dont have any kind of ...
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2answers
597 views

ASA's traffic policy(QoS) for ipsec VPN tunnels

i have ipsec l2l VPN over internet, I wander if there is default policy in ASA for making ipsec traffic with higher priority? My question basically is, if one of packet from two packets must be ...
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1answer
190 views

The meaning of end-to-end QoS in network

When saying (end-to-end QoS) in network, what do we really mean by that?
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1answer
839 views

Can I truly multicast over Wifi AP

I have a small dedicated wifi network setup specifically to carry a multicast multimedia package.. no other use (no web or other data on this network, due to the arrangement).. The issue I've found ...