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.

25 questions with no upvoted or accepted answers
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What is the advantage of Supervised Machine Learning over Deep Packet Inspection in Network Traffic Classification?

As per the definition of Deep Packet Inspection (DPI), it uses signatures for packet filtering. Supervised Machine Learning can help put a label on a packet which does not get identified by Deep ...
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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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175 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 ...
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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 ...
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63 views

HTTPS QOS and policing

In our office, everything runs on HTTPS. We have softphones and web-based clients which are high priority. We also have Google search, maps and other low priority websites that should work on best-...
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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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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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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 ...
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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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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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50 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 ...
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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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527 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 ...
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184 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 (...
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785 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 ...
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11 views

What is the difference between meters and queues in Openflow?

I'm new to OpenFlow and have just started studying Software Defined Networking. I have found a multiple websites mentioning that queues and meters are complementary to each other, and that they should ...
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36 views

Applying DSCP to an interface

I'm trying to apply DSCP (AF41) to an interface eth-trunk (if it matters) - [~HUAWEI] diffserv domain QoS \ creating diffserv domain named QoS [~HUAWEI] dsdomain QoS] ip-dscp-outbound af4 ...
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40 views

Packet scheduling in LTE/5G core network components

Scheduling algorithms must be used in radio side of these technologies in order to map radio sources to incoming/outgoing data packets and satisfy quality of service requirements such as latency and ...
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69 views

I'm unable to see packet drops after configuration of QoS policy

I aim to send iperf traffic from Endpoint1(Client) to Endpoint2 (Server) with the following SR path = {R1, R2, R3, R4, R3, R2, R1, R2, and R3}. First of all, the traffic generated by iperf from ...
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54 views

Cisco Catalyst QoS queuing model

How Cisco Hardware queuing model (like 1p7q4t for Cat6800) are related to traffic classes (class-map) ? How assign the X traffic class to Y hardware queue ? Also, if only 6 classes are configured, ...
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16 views

Why in DRR (Deficit Round Robin) is the Deficit Counter set to 0 when the list of packets for a flow gets empty?

I'm studying DRR scheduling algorithm (https://www2.cs.duke.edu/courses/cps214/spring09/papers/drr.pdf) but I don't understand why the deficit counter is always reset to 0 when the list of a flow get ...
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1answer
115 views

CISCO Tc Bc and CIR units

Are the units in these formulas correct? Tc (seconds) = Bc (bits) / CIR (bits per second) Tc (milliseconds) = Tc (seconds) * 1000 Bc (bits) = Tc (seconds) * CIR (bits per second) CIR (bits per second)...
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36 views

What is the difference between Custom Queuing and Weighted Fair Queuing?

I understand that both mechanisms send traffic in a round-robin fashion, and the traffic is sent proportionally to their weight based on the ToS of the traffic. However, I don't understand the ...
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1answer
70 views

How color is encoded in the DS field/ToS IPv4 - QoS?

The RFC 2698 says - "The color is coded in the DS field [RFC2474] of the packet in a PHB specific manner". I am trying to understand how color is encoded like in the IPv4 header - in the TOS field ...
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116 views

Cisco QoS Queuing models

I would have a question about the Cisco Queuing models. For example, when we speak about 1p7q3t, or 2p6q3t, or others models, does it from hardware or software considerations ? If it's hardware, if ...