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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votes
1answer
36k views

How can I reasonably verify my QoS configuration is working?

Context I've deployed a standard QoS config to a customer site running a Cisco 891 router with IOS 15.1(4)M4. The WAN link is a single ADSL2+ link (24/1Mbps) connected to FE8. I've previously tested ...
5
votes
1answer
8k views

QoS voice traffic on WAN of Cisco 1841

I have the following lab topology and I am using the below configuration on the 1841. What I want to achieve here is reserve 1000Kbps of bandwidth for traffic between the voice VLAN and the remote ...
10
votes
2answers
12k views

How do you throttle Dropbox Traffic?

It appears that Dropbox uses Amazon AWS for it's storage, so I am not able to just block or trottle traffic to dropbox.com Since there are a lot of web services that rely on AmazonAWS, I cannot just ...
2
votes
2answers
442 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 ...
9
votes
1answer
2k views

Globally disable QoS on Cisco 3750 in production

I suspect some issues with faulty QoS settings on a 3750 stack running in a 24x7 environment. The 3750 mainly routes between vlans on a lan segment. Since it is a lan device (not terminating any wan ...
8
votes
1answer
620 views

Ethernet switch capable of H-QoS at the 802.1q level

I have the following type of links at the edge of my ISP cloud: +-----------------------+ ...
5
votes
2answers
5k views

How do I tag traffic with a DSCP value on an ASA?

I have a SIP Server that does not put a DSCP code on it's traffic. This server is behind an ASA, and I want to prioritize its traffic passing through an ASA from the private to public network. I am ...
7
votes
1answer
275 views

How is probabilistic marking performed with Random Early Detection?

I am currently studying for my Computer Networks exam. I cannot wrap my head around the following. When the current Average Queue Length is in between a min_threshold and a max_threshold, the Random ...
6
votes
1answer
253 views

Why there is a maximum of 4096 queues in WFQ?

In QoS there is a variety of Queuing methods and one of them is WFQ, which organizes the flows in different queues where each queue has a weight that determines which flow will go first. Now for ...
6
votes
2answers
461 views

Metro Ethernet settings on Customer devices

I am about to connect three remote sites to the main office by means of an metro ethernet provided by a service provider. The sites are connected by means of l3 and running OSPF on the connecting ...
8
votes
3answers
4k views

Traffic Policing

I know traffic policing isn't something that you normally find in a LAN environment, and I wish I wouldn't be finding it in mine. That being said... I have no choice. The device is a 3750X. The ...
6
votes
3answers
4k views

How to throttle speed for a particular computer with high activity?

We're in an office environment of about 50 people. A few departments send emails with large attachments extensively and doing so clogs up the WAN connection (10Mbps). I'm upgrading the networking ...
11
votes
6answers
6k views

Weather map and monitoring for network usage [closed]

What tools are able to provide an almost real time weather map of usage and average traffic per timeframe going over the different links? What are some ways or solutions to actively monitor my ...
7
votes
2answers
911 views

DSCP trust boundary

I have performed some analysis and noticed that traffic coming in from the Internet contains a myriad of DSCP values. This traffic competes for voice and video resources on the internal network. How ...
6
votes
3answers
378 views

QoS at the edge of branch

I have a question about QoS design in branch. The main place to deploy qos in branch - edge between edge router and ISP. At this edge we have voice traffic to SIP provider, copr. external email and ...
8
votes
2answers
136 views

TDMoE and QoS considerations

As mentioned in the previous question I am looking at sending voice communications over a Metro Ethernet connection shared also by data connections. In addition to the previous question I have this ...
13
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1answer
13k views

What is the 5 level QoS model (through config example)?

I have heard people stating that their network "operates a 5 level (or layer) QoS model" Sometimes they also mention a 7 level QoS model. Can anyone provide me with a Cisco IOS config example of ...
6
votes
2answers
6k views

QoS on HP Procurve 2520 and 3800 switches

Do Procurve switches remark cos/dscp values between switches (trust boundaries) as Cisco switches do? I'm wondering if there is an equivalent to "mls qos trust (cos/dscp)" in the HP realm.
13
votes
2answers
22k views

How can I verify QoS DSCP marking on a Cisco Catalyst 4500E?

Good afternoon, I've got a shiny new 4500E running 15.0(1r)SG7 that is set to replace an ailing 3750E. It is running ipbase for now. On the 3750 I was able to check out the incoming DSCP/CoS values ...

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