Aaron's Worthless Words

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qos

QoS? Really?

I wrote this post during Cisco Live and said “I’ll just give it a once-over tonight and publish it.” That was something like 6 weeks ago now. What a loser I am. Yes, really. QoS has actually gotten some attention this year. After how many years of living in

QoS Notes - IPP and DSCP Values

This is a study note post, so please don’t take this as written. I’m not the authority on the subject, so please correct me if needed. Back in the day, somebody decided that we all needed to have a Type of Service (ToS) field in the header of

Stubby Post - Time-based ACLs and Policy-maps

Certain divisions of the company tend to shoot themselves in the foot by kicking off large file transfers during business hours, so I had a thought that maybe we could use time-based ACLs to do some QoSing for those guys. I fired up GNS3 with a 3600 running 12.4(

NBAR and HTTP Data Conversations

I’m still working on the ONT test and doing labs, so I marked up a lab for me to work. I’m using the same setup as I did last time. The two routers are 3640s running 12.4(25b). Part of the lab was to identify HTTP traffic

QoS Pre-classify and Class-map Order

I’m still studying for the ONT test, so I did some labs tonight. One of them was to demonstrate the qos pre-classify command for tunnel interfaces. When you have a packet sent over a GRE tunnel, the ToS field gets copied to the GRE packet, but there’s no

ONT Notes - QoS On Wireless Networks

* Wireless LANs (WLANs) * Extensions to wired LANs * Carrier sense multiple access collision avoidance (CSMA/CA) as media access method * Uses distributed coordinated function (DCF) for collision avoidance * DCF is based on RF carrier sense, inter-frame spacing (IFS), and random wait timers * Wifi QoS standards * 802.11e * IEEE standard * 0-7 priority

ONT Notes - AutoQoS

* AutoQoS benefits * Automates QoS for most deployments * Protects business-critical apps to maximize availability * Simplifies QoS deployments * Reduces configuration errors * Cheaper, faster, and simpler deployments * Follows DiffServ * Allows complete control over QoS configs * Allows modification of auto-generated configs * AutoQoS phases of evolution * AutoQoS VOIP – Early version that configures the basics without