Archive for the ‘QoS’ Category

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. VI. QoS Quality of service solutions Classification and Marking Using MQC Using NBAR Using PBR Using CAR QoS Policy Propagation via BGP DE DE List MQ 3550...

December 27th, 2008 | QoS | 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). CQ handles traffic by specifying the number of packets or bytes to be...

December 15th, 2008 | QoS | 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. Priority Queue commands are processed like an access-list, they are read...

December 7th, 2008 | QoS | 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. CBWFQ is configured using MQC A mechanism that enables the users to guarantee a minimum amount of bandwidth CBWFQ reserves multiple FIFO queues in the WFQ system The default...

December 7th, 2008 | QoS | 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. Below are my goals for today: Classification Access-Lists IP Precedence DSCP NBAR Packet Length FR-DE Interface Not Congestion...

December 7th, 2008 | QoS | 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...

August 10th, 2008 | QoS | 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...

June 29th, 2008 | Bootcamp, QoS | 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...

June 9th, 2008 | QoS | Read More