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
465 views

Downstream QoS Feasibility

I work for a VoIP provider, and one of the biggest hassles I deal with is downstream traffic management. Our flagship product is QoS-enabled bonded T1 or SHDSL bundles configured to support our own ...
4
votes
1answer
569 views

Why doesn't ISPs reset DSCP at the edge before delivering traffic to customers?

Some ISPs are doing QoS based on traffic type (online streaming), such as Comcast and Cogent. Why don't they reset IP DSCP at the edge so it is not as obvious that they are doing some kind of traffic ...
1
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0answers
183 views

Is it possible to calculate the path loss in an UMTS system if the current HNB CPICH power and RSCP values are known?

Please let me further elaborate on my question: Let's say we have an HNB with 2 Watts of power allocated for the common pilot channel. This would mean that the radiated signal power at the HNB site (...
2
votes
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 ...
8
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2answers
1k views

QoS Video - I want to prioritise video traffic. What protocols and port numbers should I add to my QoS design?

Can someone please tell me what protocols and port numbers I need to add to my Prec 5 DSCP QoS configurations to ensure that any video traffic gets pushed out first if there is congestion. Is it just ...
1
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2answers
469 views

QoS with SharePoint Online

Can QoS for a corporate environment be adjusted to prioritize traffic from SharePoint online so that improves user experience when uploading/downloading large files? My network team is telling me no ...
2
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0answers
174 views

Shaping on ES20/7606-S

I've recently moved from point-to-point WAN to a point-to-multipoint WAN, unfortunately this has really messed up my brain...in regards to shaping. These circuits are aggregated into three physical ...
1
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3answers
411 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?
2
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1answer
581 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-...
6
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2answers
8k views

ISP edge router configuration

I need to configure Cisco 2901 router to route between interconnect block and usable ip block. Circuit is fiber 30Mb/s I got this info from ISP provider: IP space: Interconnect block - 50.204.xxx.80/...
1
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1answer
684 views

DSCP trust over IPSec GRE

I have 2 branch offices connecting together via a metro-e and I'm running an ipsec gre tunnel between the 2 sites. routerA=branch1 routerB=branch2 WAN-------routerA----------|metroe|------------...
1
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0answers
783 views

Juniper SRX MPLS Egress Prioritization

I can't for the life of me to get any egress queue prioritization to happen on an SRX. I have a single label switched path out of the SRX, and a couple of ethernet-ccc's. One ccc is entirely ...
5
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1answer
848 views

Is it possible to shape and queue on a switched port in a cisco 4506-E?

Background I have a cisco 4506-E with a sup 7L-E running IOS-XE 03.04.03.SG. The switch is connected to a 150 Mbps circuit via 1 Gbps ethernet port. The port is configured as a switched access port....
5
votes
1answer
1k views

Juniper destination based CoS

I'm trying to do destination based CoS on Juniper MX basing on destination ASN. I've tried config below. set policy-options as-path BGP-PATH-TO-MARK-COS "65512 .* set policy-options policy-statement ...
2
votes
1answer
789 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 ...
4
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1answer
299 views

protect sensitive traffic if end-to-end QoS is not possible

I have a very typical scenario where I would like to protect IP phones traffic from high RTT, packet delay variation and packet loss on congested links. I fully understand, that QoS would help only in ...
4
votes
1answer
1k views

How do you control WAN Download Bandwith on an ASA?

I have a Cisco ASA and cannot seem to control bandwith from the Internet to the device that well. The ASA supports Shaping, but only on outbound traffic which works great. My question is how to ...
6
votes
1answer
3k views

TX-ring-limit Values

So, I am getting deep into my CCIE study and I just read about the TX-ring-limit interface command. I have used QoS a bit to oversubscribe software buffers to prevent frame loss on switches and ...
2
votes
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 ...
8
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4answers
522 views

QoS on a dedicated VOIP network

Is there any point in enabling QoS on a dedicated VOIP network that only has VOIP traffic?
7
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1answer
7k views

Auto-QOS configuration for Cisco network

I have a network with Cisco switches, Cisco IP Phones and video traffic. I want to add QoS markers to my traffic but I don't want to do it manually. Ideally I want to use Cisco's auto QOS features ...
10
votes
3answers
7k views

How are Weighted Fair Queuing and Weighted Random Early Detection related?

I'm trying to understand how QoS systems work and I'm not sure how exactly would WFQ and WRED interact. At first, I thought that WFQ is a queuing mechanism and that WRED is a congestion avoidance ...
5
votes
2answers
3k views

Minimum Bandwidth Guarantee 3750-X

I am about to implement a network at a remote office that will also be providing some bandwidth to a sub tenant. We have a 50 Mbps connection terminating to a VLAN on a 3750-X. Each company has an L2 ...
3
votes
1answer
3k views

How to test Wi-Fi Multimedia (WMM) QoS management with LANforge?

I would like to test the Wi-Fi Multimedia (WMM) feature of an access point AP. How can I test it using Candela Technologies LANforge-WiFIRE WiFi traffic generator? Some thoughts after reading the ...
10
votes
1answer
2k views

QoS between two VLANs with Cisco 881 Router (IOS)

I'm hoping to get some advice regarding the best practice to delegate a limited Internet connection between two VLANs. In my case, one VLAN is for an office network, and the other is for guests. What ...
2
votes
1answer
5k views

QoS bandwith calculation

Please explain: I have two routers with QoS on them.. Both WAN-facing interfaces have a bandwidth command with the same value (100000) but the priority queue (also the other reservations) calculates ...
16
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3answers
3k views

class-default matches control traffic?

I'm seeing an issue with BFD on a link that's being policed egress where it appears during times where the policer is maxed BFD packets are not getting to the other side. I'm wondering if BFD hellos ...
4
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2answers
4k views

cisco 877 router QoS on traffic with a specific destination

Is it possible to throttle traffic coming or going to a specific ip address on a cisco 877 running : C870-ADVIPSERVICESK9-M, 12.4(15)T12, RELEASE SOFTWARE (fc3)? Background: we have a WAN where ...
2
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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 ...
5
votes
1answer
473 views

Cisco 7604 + RSP720 3CXL + WS-X6704-10GE QOS marking problem

Cisco 7604 + RSP720 3CXL + WS-X6704-10GE, need to understand how much traffic from the client comes to external resources, and how much goes to internal network resources. Mark incoming traffic to ...
10
votes
1answer
35k 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 ...
11
votes
1answer
547 views

enforcing QoS on a “variable” speed link where the negotiation is done by the carriers NTE

In essence we purchase a 80/20 line from the carrier who provides the transport between the customer premises & the local exchange where the carrier terminates into our PE. (Juniper PE) <--> [...
9
votes
2answers
2k views

QoS woes - managed IP VPN

(First of all, I'm sorry for this wall of text. I don't know how to make it any shorter without losing important information. I originally wanted to use the chat room for this, like we do on ...
5
votes
1answer
7k 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 ...
5
votes
1answer
837 views

ASA Traffic Shapping on a burstable circuit

I am connecting to a 100Mbit WAN circuit, that is Burstable to 500Mbit. If I am going to use ASA traffic shaping on this, would I set the shape average to 100Mbit or 500Mbit? My main concern is ...
10
votes
2answers
11k 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
429 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
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1answer
603 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
265 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
247 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
453 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
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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 ...
9
votes
4answers
754 views

How does one specify certain IPs or MAC addresses for NBAR policy enforcement?

In an office environment, if I wanted to block youtube using a Cisco ISR router, I would set up the following with NBAR: class-map match-all YOUTUBE match protocol http host "*youtube.com*" ! policy-...
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 ...
7
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2answers
877 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 ...
22
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10answers
24k views

How to generate traffic for lab scenarios [closed]

I'd like to start exploring QoS, and lower level optimizations for things like broadcasts/multicasts within my home lab. I've looked around for ways to generate traffic to and from a box, but haven't ...
6
votes
3answers
376 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 ...
14
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4answers
4k views

Enabling MLS QoS on a production 7600

I am looking at a 7609-S with a RSP720-3CXL running 12.2(33)SRE3. I have been asked to help with rate limiting some servers attached to a couple of ports running as L2 ports (switchport mode access), ...