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.
251 questions
3 votes
2 answers
235 views
How does WRED achieve congestion avoidance?
I understand what WRED is and what it does. I understand that once we exceed a certain threshold, it will start randomly dropping packets to prevent the queue from becoming full. I also understand ...
- 1,031
0 votes
0 answers
60 views
cisco Shaper konfiguration for specific Serviceprovider SLA
given is a GigabeitEthernet based Internet access. The Provider is Policing the Interface to 400MBit/s and allows a maximum Burst of 60kBytes. I'm trying to configure a Cisco ISR1000 Router as a CPE ...
- 554
0 votes
0 answers
49 views
Policing the LLQ in QoS
I am studying QoS for my ENCOR exam and my study resources mention LLQ and policing. With LLQs, if we don’t define a policing limit, the LLQ could starve out the other queues if it’s constantly ...
- 1,031
3 votes
2 answers
1k views
What exactly is the difference between bandwidth and speed?
I am currently studying QoS and I am often confused and tend to mix the terms "Bandwidth" and "Speed". If I am not mistaken, bandwidth is the capacity of the link, correct? While ...
- 1,031
4 votes
1 answer
163 views
QoS during non-congestion
I am currently studying QoS and I have a question regarding queuing during non-congestion times. I would just like to confirm whether my understanding is correct regarding queuing during non-...
- 1,031
1 vote
0 answers
79 views
How Out-of-profile DSCP mapping helps to prevent misuse of bandwidth if it can't be remapped to a different queue?
On Cisco SG-300 series and CBS-350 series switches an attempt to configure Out-of-profile DSCP value 46 (EF) to 18 (AF21) causes the following error: The re-mapped dscp must be mapped to the same ...
- 123
1 vote
1 answer
229 views
QoS on Juniper SRX 320
I'm doing a lab because I need to mark traffic with 802.1p tag to apply QoS on my ISP layer 2 uplink. I've managed to classify my network traffic and did applyed DSCP marking on the packets but I can'...
0 votes
1 answer
81 views
Designing a web-facing network for redundancy and QoS (in a small business)
Summary How does one configure the web-facing part of a small business network for redundancy and quality of service? I mean ... we can have the control over our internal infrastructure, but what ...
1 vote
1 answer
135 views
A question about WRED in QoS
I understand what WRED is and what goals it aims to achieve during congestion (drop packets, avoid Taildrop and so on). However, the actual principle of it is quite confusing to me. Consider this ...
- 1,031
0 votes
1 answer
241 views
Correct interpretation "show mls qos"
I ask you to tell me in the correct interpretation of the output of commands on the Cisco Catalyst 3750. command "show mls qos interface fastEthernet 0/3 statistics". Outputs the following: ...
- 39
1 vote
2 answers
121 views
How did ATM switches that were implemented in a core of IP network improve QoS and higher data rate?
How can ATM switch improve Quality of service and data rate just by incorporating them into the core of IP network? What was used in the sore of IP networks before ATM switches and what is used today ...
0 votes
3 answers
255 views
How does policing prevent LLQ queue starvation? (QoS)
A networking course that I follow mentions the following information about LLQ (Low Latency Queuing) in QoS LLQ designates one (or more) queues as strict priority queues. This means that if there is ...
- 1,031
3 votes
1 answer
688 views
Are all 64 DSCP values usable/configurable?
I have read that DSCP consists of 6 bits, thus providing us with 64 DSCP marking values (0-63). If I understood all correctly, 21 of these values have been standardized and named (AF, EF, DF, etc) ...
- 1,031
1 vote
1 answer
85 views
How do multiple queues work ? (QoS)
A course I am watching mentions that an essential part of QoS is the use of multiple queues. How exactly do these multiple queues work? Are they built into the device or is manual configuration ...
- 1,031
1 vote
1 answer
1k views
Classification and Marking using PCP
A networking course that I am following mentions that layer 2 marking can be performed through the use of PCP in the dot1q tag. So to help me understand, once a switch receives a frame with a dot1q ...
- 1,031