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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941 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 ...
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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
338 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
89 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 ...
2
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2answers
3k views

How does throttling of network traffic work (to limit bandwidth by ISP e.g.)?

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
771 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
174 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
624 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
271 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
919 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 ...
2
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1answer
68 views

Is there a way to prioritize/manage WIFI traffic (in the WIFI realm)?

So I have a WIFI/client application which has some specific issues, in that several devices need to absolute priority. Fortunately, i'm able to prevent MOST devices from joining the network, but I ...
3
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1answer
993 views

QoS - Difference between MQC and HQF

I understand that the older versions of Cisco IOS implemented the MCQ and the newer one's implement HQF. Could some explain what is the difference between MQC and HQF? Thank you.
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2answers
203 views

How ISP track the individual subscriber data download and falling back to lower mbps?

I work on software development for routers. So, I am aware of QoS in routers, where we can do scheduling and policing of the traffic. However, one question is still in my mind, is how does the ISP ...
2
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1answer
847 views

Use bandwidth and shape concurrent

I have a question about QoS with multiple classes. In our switch with IOS-XE we use five classes to define QoS. Class 1 is a priority class so configured “priority level 1”. The remaining bandwidth of ...
2
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2answers
403 views

Cisco QoS Confirmation

Can anyone doublecheck my basic Cisco QoS configuration. I've got a small remote site connected via AT&T 20Mb line that communicates over an IPSec tunnel. class-map match-any QoS-Voice match ip ...
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1answer
42 views

LSA Weighted Fair Queuing Algorithm

In weighted round robin (weighted fair queuing) scheduling, suppose I have 3 queues (weights):- A (4), B (3) and C (2). I have packets of equal lengths on the 3 queues. Now will the packet output ...
3
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2answers
1k views

Extract QoS Buffer Drops via SNMP

I am in the process of rolling out solarwinds for visibility of QoS performance using netflow and CBQOS to show QoS class usage. One thing I am unsure of is what type of monitoring is available on L2 ...
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1answer
683 views

Best method for rate limiting ingress & egress traffic hosts in colocation

What is the best method for the limiting speed of internet access for hosts in our colocation. We have a full rack which will be connected to the internet at 200/200 Mbps. We have our colo equipment ...
2
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1answer
213 views

Qos Packet drops

My question is : This subinterface has a Qos policy settings its speed to 800000 (800kbps) If i have an offered rate of only 19000 bps, why is there a drop rate of drop rate 3000 bps ? Service-...
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1answer
1k views

QoS (802.1p) for iSCSI Traffic on Cisco Nexus 3048

We're building a new core for our University and one thing that bugs me is the iSCSI network. We already considered Jumbo Frames and Flow Control on the iSCSI ports, but one thing remains for debate, ...
8
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2answers
2k views

Basic Catalyst 3560 Egress Shaping

We have a service provider (and we can't change providers) who is giving us a "metro ethernet" style connection between two of our locations. On each end, we plug into an ethernet port on a provider's ...
1
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1answer
945 views

How to use a layer 3 switch for QOS between gateway and hosts?

In the following scenario, is it possible to prioritize VOIP/RTP from x.x.x.51 through the gateway with a Cisco switch, and how? I need to prevent x.x.x.50 from saturating the WAN connection. ...
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2answers
231 views

Applying a queuing service policy

This is on a Nexus N5624Q. I have this TA-queuing service policy : policy-map type queuing TA-queuing class type queuing queue-cos1 bandwidth percent 20 class type queuing queue-cos2 ...
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1answer
1k views

TXOP and Service Period in 802.11e

I want to know what is TXOP and what is service period in 802.11n or 802.11e. Is there any relation or difference between TXOP and SP Thanks, Devaa
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0answers
1k views

Configuring QoS on Cisco ASA 5525-X

I'm trying to configure QoS on a Cisco 5525-X ASA and feel like I'm beginning to get a handle on it but the queue-limit and tx-ring-limit calculations are losing me. What I've got right now is a ...
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1answer
3k views

VLAN Tags and QoS

I have a bunch of phones that are tagged as VLANID 20 with priority 7. I have the router setup with VLAN Tagging as well to mark VLANID 20. My question in terms of switches. Do the switches need to ...
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1answer
540 views

How packets get differentiated to prioritize?

On the Internet, there are many types of packets: VoIP, Audio, Video. As QoS is used to prioritize packets based on DSCP or VLAN priority. who set these bits for each and every packet. Like Audio gets ...
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1answer
913 views

Problem configuring QoS with FlowVisor and OpenVswitch

I am running a small experiment to isolate bandwidth with flowvisor (version 1.4, version 1.0 of openflow) implementing a port based slicing. With mininet, I create a topology that consists of a host ...
2
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1answer
234 views

Rate limit based on VLAN

My ISP company has some PoPs in remote areas, as shown in diagram. It is currently, it's getting all prefixes from Local IX and getting only a default route from the upstream Internet provider. ...
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1answer
154 views

Throttling Internet speed to device or vlan

I have a Netgear FVS318N Firewall/Router, GS752TP Switch, and a Netgear WNAP210 AP. After a bit of searching, I have identified a machine that is using the lion's share of bandwidth (youtube). Is it ...
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2answers
170 views

Testing Bandwidth in preparation of tele conferencing

I am working for a company that is installing a video conferencing e-learning web application that is using a red5 media server. The client is complaining that the performance is choppy/slow, and my ...
2
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1answer
2k views

Cisco QoS - Default Class Allocation

I'm running new IOS 15.4.3(M2) on 2911 and 15.4.3(S3) on ISR4331s. I have the following QoS policy: policy-map WAN-EGRESS-POLICY class CLASSIFY-AF41 bandwidth remaining percent 25 class ...
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1answer
211 views

Throttle traffic over a link?

I work for a global company in the client support department. Another department manages the network. My team is frequently asked to throttle client traffic from our on-premises Apple software update ...
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3answers
895 views

LAN QoS for VoIP

Is LAN QoS required for VoIP applications? We have basic network infrastructure: PC (Softphone) -GigEth-> [Switch] -GigEth-> [Router/Firewall] -> Internet (100 Mbps) -> [ITSP] Voice ...
2
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1answer
435 views

QoS in a small network

I have a small engineering network with a Linux router, LAN nodes on the one side of the router, and a WAN link attached to the router. The WAN link is a 16mbit/s wireless channel, while the LAN nodes ...
2
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0answers
227 views

How to configure QoS on router? [closed]

I want to prioritize applications which use the internet but in the QoS I find the applications are IGMP SIP H.323 MGCP SNMP DNS DHCP RIP RSTP RTCP RTP, I don't understand which of them is responsible ...
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0answers
542 views

Verify my cisco QoS script

I've written the below config for the following network topology: 6509 switch acting as collapsed core for data access switches, voice access switches and wifi access switches. The 6509 then connects ...
5
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1answer
263 views

VoIP QoS over DIA/L3VPN physical circuit

This Q. is really confirmation to what I already suspect. On a single physical interface with a carrier that uses two dot1q logical sub interfaces to handle DIA and L3VPN, I suspect any usage of DIA ...
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1answer
368 views

QOS on Nortel Devices

I need to set up the following on Several Nortel Baystack's (5530/5520): "Assign a priority to DXL VoIP traffic with a DSCP priority level which will be co-exist with the rest of the real-time ...
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1answer
251 views

Throttling among Data Centers

In general, links among data centers are shared (having shared network infrastructure). Thus, I can't detect the available bandwidth in between two data centers that may vary every while and through ...
2
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1answer
109 views

Signals wise, how does dropping an ingress packet due to policing look like?

The context of my question is actually another question which is "Why isn't ingress shaping possible?". So yes, I get the whole "you can't affect packets you haven't received yet" idea, but we can't ...
9
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2answers
2k views

Which QoS classification should be applied to NTP?

Cisco's Enterprise QoS Solution Reference Network Design suggests classifying NTP as network management traffic and marking it as CS2: When addressing the QoS needs of Network Management traffic, ...
3
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1answer
669 views

QoS DSCP AF Class Comparisons

I'm having trouble wrapping my head around DSCP AF Classes and what--all else being equal--gets dropped first. I understand packets are given a Class, 1-4. The higher the Class number, the higher ...
4
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3answers
5k views

QoS or more bandwidth?

Being in SP field I sometimes hear folks say "we do not need QoS, just let's make sure we have enough bandwidth". This has always been bothering me, because currently we have a network without any QoS ...
4
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1answer
7k views

Understand the output of “sh policy-map int” in Cisco IOS

I have a following CBWFQ configuration: ! ip access-list extended GRE-traffic-ACL permit ip host 10.10.11.2 host 10.10.11.1 ! ! class-map match-all GRE-traffic match access-group name GRE-traffic-...
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1answer
2k views

QoS for site to site VPN

Hey guys maybe you could help me. I have one main site is a clinic where we have a PACS server. So we have 3 more clinics around the country with VPN to send pictures to the server. Now we have 4 ...
2
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1answer
2k views

IOS-XR - How to get bandwidth policed on an interface

How can I get in a straight-forward way the bandwidth policed on a certain interface on IOS-XR. In IOS, I execute show policy-map interface Gi1/1.1000 And I get clearly the BW policed on ...
4
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1answer
979 views

QoS between two sites

I have a following topology where Internet service providers for both sites provide 10Mbps connection: There is a GRE tunnel between the sites and I would like to ensure that this tunnel is up even ...
4
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1answer
1k views

Rate limiting specific IP adresses on Cisco 2960S and 2960X series

We are looking into rate limiting some specific IP addresses down to 5mbit for various bandwidth reasons. Is is possible to rate limit ingress and egress traffic for specific IP addressees on the ...
4
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2answers
943 views

Equal WAN bandwidth for all LAN devices using Sonicwall NSA 2400/2600

I have a Sonicwall NSA 2400 (soon to replace with NSA 2600). The LAN has a widely varying number of users/devices. Some days there are 10 people onsite, some days 75-100. I want to be able to ...