Qos

QoS? Really?

2016-08-20 ·3 min read

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 …

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QoS Notes - IPP and DSCP Values

2013-07-30 ·3 min read

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 …

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Stubby Post - Time-based ACLs and Policy-maps

2010-04-28 ·2 min read

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 …

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NBAR and HTTP Data Conversations

2010-03-08 ·3 min read

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 …

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QoS Pre-classify and Class-map Order

2010-03-06 ·4 min read

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 …

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ONT Notes - QoS On Wireless Networks

2010-02-11 ·2 min read

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 …

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ONT Notes - AutoQoS

2010-02-10 ·2 min read

AutoQoS benefits Automates QoS for most deployments Protects business-critical apps to maximize availability Simplifies QoS deployments Reduces configuration errors Cheaper, faster, and simpler …

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ONT Notes - Pre-classify and End-to-end QoS

2010-02-04 ·2 min read

VPNs (Didn’t ISCW cover this?) Provide Confidentiality Integrity Authentication Types Remote-access Client-initiated NAS-initiated Site-to-site LAN-to-LAN Extranet L3 Tunneling protocols GRE …

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ONT Notes - Congestion Avoidance, Policing, Shaping, and Link Efficiency

2010-02-03 ·2 min read

Tail drop drawbacks TCP synchronization - Dropping TCP packets from different flows can cause them all to window down and back up again at the same time in cycles. TCP starvation - Non-TCP or …

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ONT Notes - Queuing

2010-01-24 ·3 min read

Here are some more notes from my studies. Of course, no one cares about them but me, but it’s my blog. I’m sure someone will find it useful. Please help to correct dumbass mistakes. Congestion …

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