A friend was looking for some input on low latency queuing yesterday. I thought the exchange we had could be useful for others so I decided to write a quick post. The query was where the rule about the priority
General – Behavior Of QoS Queues On Cisco IOS
I have been running some QoS tests lately and wanted to share some of my results. Some of this behavior is described in various documentation guides but it’s not really clearly described in one place. I’ll describe what I have
QoS Terminology – Comparing Cisco to MEF and RFC Terminology
Have you every thought that you knew a topic pretty well but then someone uses terminology that you aren’t used to? People that use Cisco a lot or live outside the MEF world use another terminology than people that are
QoS Design Notes for CCDE
Trying to get my CCDE studies going again. I’ve finished the End to End QoS Design book (relevant parts) and here are my notes on QoS design. Basic QoS Different applications require different treatment, the most important parameters are: Delay:
Borrowing Credits When Using Shaper on Cisco IOS
Introduction When using a shaper on IOS, the shaper allows a deficit to be created, borrowing future credits. It’s common knowledge that a shaper queues or buffers packets but it’s not common knowledge that the shaper allows a deficit to
Catalyst QoS – A deeper look at the egress queues
I’ve done a post earlier on Catalyst QoS. That described how to configure the QoS features on the Catalyst but I didn’t describe in detail how the buffers work on the Catalyst platform. In this post I will go into
Catalyst QoS
I’m back studying and I have already booked a new lab date. I won’t make an announcement until I get back. This is to keep a bit of the pressure off from taking the lab. The last couple of days
QoS studies
Did some more QoS labs yesterday. I have completed roughly 50/80 labs so far. Here is a quick tip for looking at what policy-maps are assigned to interfaces. Show run | i interface|service-policy Here is a question for my readers.
Quality of Service – notes
Hardware queue Packets can be sent trough hardware queue without interrupting CPU Always uses FIFO logic Cannot be affected by IOS queuing tools Class Based Weighted Fair Queing Every class (queue) gets a defined percentage/amount of bandwidth If a class