In this final part of our blog series on QoS with the PIX/ASA, we examine the remaining two tools that we find on some devices - traffic shaping and traffic policing. Read More

This blog is focusing on QoS on the PIX/ASA and is based on 7.2 code to be consistent with the CCIE Security Lab Exam as of the date of this post. I will create a later blog regarding new features to 8.X code for all of you non-exam biased readers :-) Read More

Note: The following post is an excerpt from the full QoS section of IEWB-RS VOL1 version 5. Peak shaping may look confusing at first sight; however, its function becomes clear once you think of oversubscription. As we discussed before, oversubscription means selling customers more bandwidth than a network can supply, hoping that not all connections would use their maximum sending rate at the same time. With oversubscription, traffic contract usually specifies three parameters: PIR, CIR and Tc –... Read More

This may seem to be a basic topic, but it looks like many people are still confused by the difference between those two concepts. Let us clear this confusion at once! Read More

The goal of this article is to discuss how would the following configuration work in the 3560 series switches: interface FastEthernet0/13 switchport mode access load-interval 30 speed 10 srr-queue bandwidth shape 50 0 0 0 srr-queue bandwidth share 33 33 33 1 srr-queue bandwidth limit 20 Before we begin, let’s recap what we know so far about the 3560 egress queuing: 1) When SRR scheduler is configured in shared mode, bandwidth allocated to each queue is based on relative weight. E.g. when... Read More

To begin with, why whould anyone need to run Multilink PPP (MLPPP or MLP) with Interleaving over Frame-Relay? Well, back in days, when Frame-Relay and ATM were really popular, there was a need to interwork the two technologies: that is, transparently pass encapsulated packets between FR and ATM PVCs. (This is similar in concept with modern L2 VPN interworking, however it was specific to ATM and Frame-Relay). Let's imagine a situation where we have slow ATM and Frame-Relay links, used to... Read More

This is a "modern" way to configure FRTS, using MQC commands only to accomplish the task. With MQC approach, an unified interface has been introduced to configure all QoS settings, irrelevant of underlying technology. Read More