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.
218
questions
3
votes
2answers
616 views
QoS: priority-queue out
I'm trying to understand the priority-queue out command configured on an interface.
Based on what I have read, here is what it does : the Priority Queue (Queue 1) on the switch will be emptied before ...
1
vote
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 ...
2
votes
1answer
509 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-...
3
votes
2answers
397 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 ...
1
vote
1answer
192 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
124 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
1answer
61 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
834 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
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 ...
2
votes
1answer
2k 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
71 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
63 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
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 ...
1
vote
0answers
225 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
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
votes
1answer
105 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
38 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
...
1
vote
1answer
143 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....
2
votes
2answers
470 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
305 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
539 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
795 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
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 ...
1
vote
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 ...
1
vote
1answer
245 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
618 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
764 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
186 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
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 ...
1
vote
1answer
160 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)
---------------------------...
10
votes
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) ...
1
vote
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 ...
2
votes
1answer
155 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
300 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
1answer
59 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
42 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 ...
1
vote
1answer
221 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
97 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
258 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
521 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
votes
1answer
223 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
450 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 ...
8
votes
3answers
6k 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, ...
1
vote
1answer
568 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
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 ...
1
vote
2answers
917 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
763 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
288 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 ...
1
vote
2answers
590 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 ...
1
vote
1answer
523 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 ...
