QoS Progress

I have been working on QoS and yeah it has been slow. I want to take my time in covering every single topic. Here is where I stand as of right now.

Read more

Custom Queueing

 

Custom Queueing is a legacy Congestion Management process that can be used to create minimum bandwidth reservation in the output queue of a given interface. Custom Queueing has a total of 16 queues (1 system and 15 user-defined).

Read more

Priority Queueing

Priority queue uses 4 queues: high, medium, normal and low. These queues have pre-assigned priority that cannot be changed. Packets in these queues are dequeued in the order that means that you can starve the lower priority queues.

Read more

Class-based WFQ

CBWFQ extends the WFQ functionality so it can support user-defined classes. Here are a few key points I have found about CBWFQ. Read more

Starting QoS Prep

I have decided to dedicate a week to QoS prep since that’s one of those topics that can haunt you in the CCIE Lab exam. I will follow the same steps as I did during Security prep, one topic at a time.

Read more

Quality of Service finished

Sorry for no posts during the last few days but I was busy pounding the remaining labs before I show up at the bootcamp in Pasadena. I took my  time on QoS and went through each QoS tool in detail doing the labs and reading Doc-CD explainations. I have been implementing QoS throughout my career but it was great to sit and read one thing at a time and everything fits. I even printed out the QoS handbook and read during my flight. Since I am out of time, I will post the Q&A that I found really interesting. Read more

Narbik’s Bootcamp - Day 5 (QoS etc)

We started the day with 3550/60 per-port per-vlan QoS and then moved on to mls qos. Narbik talked about Policers, IP Prec, DSCP values and went in detail to show us how IP Prec and DSCP values are derived. He went over Priority Queueing, Custom Queueing and explained the issues with those. According to him, the problem with PQ was that if you had more traffic in the queue higher than yours, then your queue will always starve. Read more

Applying CBWFQ to a sub-interface

Today was a long busy day at work and ended up staying late. That means no study time left for Soup-to-Nuts workbook However, I ran into an issue with QoS while trying to priortize voice traffic. So this was the issue: Voice quality between two locations was extremely poor to the point where no one can hear anything. I tried making sense out of a conversation and gave up. According to another engineer, we had QoS implemented. I went and looked at the config and it looked pretty straight forward. Matching basic ef traffic and priorizing it going out the serial interface. Simple? NO

Read more