mls qos trust what?

I'm working through the IPexperts Lab2 for the CCIE Wireless - trying to reverse engineer the solutions to the questions and understand the subjects where I'm lacking.  Namely QoS.


I was digging around trying to find the reason why the solution for section 2.8 bullet point number two was to use the command 'mls qos trust ip-precedence' for all the connections between the core switches. The

New YouTube Videos by Jerome - Wireless QoS

You may already know this, but Jerome has posted three new videos covering wireless QoS.. (thanks to @the_wifi_guy for cluing me in!)

srr-queue bandwidth shape/share

I found a good NetPro discussion regarding whether to shape or share with the srr-queue bandwidth command.  The last post in the discussion links to the 3750 configuration guide - the configuring QoS section where the default settings are shown, and more information about which queue is for what is clearly presented.


SRR Shaping and Sharing
Both the ingress and egress queues are serviced by SRR

Wireless Quality of Service Deployment Guide [©2003]

Cisco's "Wireless Quality-of-Service Deployment Guide" ©2003 [I've never seen this doc before!]


I stumbled across this crazy old document from 2003 outlining using QoS on VxWorks APs! I don't think much has changed in the way of WLAN QoS - at least not the fundamentals.  I'm hoping this will help make the QoS grooves in my brain deeper and more permanent.

QoS Policies on Autonomous APs

So after some digging, I think I might have this figured out.

The AP config guide has a section on giving priority to Voice traffic, but it doesn't show the CLI alternative to the GUI configuration section in the guide:
Cisco IOS Software Configuration Guide for Cisco Aironet Access Points, 12.2(13)JA
Giving Priority to Voice Traffic
The 7921 Deployment guide only gives you the CLI commands "

QoS Example LAN Switch Configuration (from Enterprise Mobility 4.1 Design Guide)

QoS Example LAN Switch ConfigurationAP Switch Configuration
The QoS configuration of the AP switch is relatively trivial because the switch must trust the DSCP of the LWAPP packets that are passed to it from the AP. There is no CoS marking on the LWAPP frames coming from the AP. The following is an example of this configuration. Note that this configuration addresses only the

Voice over Wireless LAN 4.1 Design Guide - auto-qos notes

Infrastructure QoS Configuration


"This section shows sample QoS configurations for switch interfaces used in the campus network. More configuration details for all the switches and routers used in this design guide is available in theAppendix , "Voice over WLAN Campus Test Architecture," testing section of this guide.
Table 10-2 shows interface commands on a Cisco 3750G access-layer switch used

QoS commands from the 7921 deployment guide

QoS Commands for Autonomous Access Points

class-map match-all RTP
 match ip dscp ef
class-map match-all SCCP
 match ip dscp cs3

policy-map Voice
 class RTP
 set cos 6
class SCCP
 set cos 3

interface X
 service-policy input Voice
 service-policy output voice

IOS Router inerface to map RTP and SCCP correctly

ip access-list extended SCCP
 permit tcp any eq 2000 any
 permit tcp any any eq 2000

Wireless LAN Professionals - Podcast series

I don't know if everyone is aware that Keith Parsons has a great weekly wireless podcast - each segment is chock full of great wireless related information.

The second in the series was with Marcus Burton regarding his recent Wireless Arbitration white paper.  It was an awesome technical deep dive into how stations access the shared wireless medium. 002 WLW – 802.11 Client Arbitration / Mgmt,

Autonomous Bridge Link with multiple VLANs

So I did some digging just now to find a document from Cisco's site that covers a bridge link with multiple VLANs, and what do you know - I found a doc that I hadn't ever seen before.

Using VLANs with Cisco Aironet Wireless Equipment 


I knew I was in the right place when I saw this network diagram: LINK 


Important notes from this document:

When you install access points, only assign the

Audio Notes

Don't know if *anyone* will find this of any value.. but I made some audio tracks on Cisco/WLAN/Voice/QoS to listen to this week.. My weak spots is definitely WLAN QoS - so since I have some long car trips coming up next week, I thought I'd put that time to good use.  Link to the MP3s: http://bit.ly/cFz7wU
It isn't a podcast, just me reading through the 7921 deployment guide (which was written

Color coded QoS chart from the Voice over Wireless LAN 4.1 Design Guide

I like the QoS  charts that are in this chapter of the design guide, but the chart runs of the page and isn't color coded like the nice QoS charts from Cisco Live BRKRST-2500 Campus QoS Design.




The LWAPP AP and WLC perform QoS baseline conversion, so that WMM values as shown below are mapped to the appropriate QoS baseline DSCP values, rather than the IEEE values.


From ccie(w)

In cases

Configuring Access Layer QoS for Voice on Cisco Catalyst 6500 with Cisco IOS SW

mls qos
! -- turns QOS on for the whole switch
mls qos map cos-dscp 0 8 16 24 32 46 48 54
! -- maps COS to DSCP using the new standards of CS3 for signaling.
interface fastethernet 5/1
! -- the interface of course
switchport mode access
! -- disable trunking
switchport voice vlan 111
! -- enable trunking when CDP detects a phone. This is called DTP or Dynamic Trunking Protocol.
switchport access

Deploying and Troubleshooting Cisco Wireless LAN Controllers ISBN # 1587058146

[notes]Multicast is not supported on APs that are connected directly to the local port of a 2000 or 2100 series controller
Not supported on 2000, 2100 or NMC:spanning tree
L2 transport 
VPN termination
External Web Authentication web server list
Port Mirroring
Cranite, Fortress, AppleTalk
QoS per-user bandwidth
IPv6 pass-through
LAG or Ether channel
Multicast Unicast Replication Mode
The load

CCIE Wireless Lab Exam Topics (Blueprint) (as of 12/9/09)

Exam Sections and Sub-task Objectives   
   
1    Implement network infrastructure to support WLANs
1.01    Implement Catalyst configuration (VLANs, VTP, STP, Trunk, Portchannel,LB..)
1.02    Implement network connectivity in WLC
1.03    Implement network connectivity in LAP (local mode, hreap + local switching)
1.04    Implement network connectivity in AP (multiple vlans, vs single vlan)
1.05

WLC config checklist

[notes]
Set QoS to platinum
enable WMM to enable QoS & ability to use U-APSD
disable DHCP address assignment requested
ensure Aggressive Load Balancing is disabled

Settings>Status>Site Survey (from phone menu)
When not in a call the phone only scans other non associated channels once the current signal strength reaches a certain threshold.  To see all APs, place a call to a wired IP phone

VoWLAN Design Guide 4.1

[notes]
VoWLAN Design Guide 4.1



U-APSD – the primary benefit is that it allows the voice client to synchronize the transmit and receive of voice frames with the AP, thereby allowing the client to go into power-save mode between the transmit and receive of each voice frame tuple.


The use of U-APSD allows the use of long DTIM intervals to maximize standby time without sacrificing call quality

Cisco Unified Wireless QoS

[notes]
Cisco Unified Wireless QoS


fixed network delay – encoding/decoding time
variable network delay – queuing/congestion

Radio downstream is most common deployment.
Radio client upstream QoS depends on client implementation.


When providing only radio downstream QoS from the AP, radio upstream client traffic is treated as best effort.


Data frames in 802.11 are sent using distributed

Enterprise Design Guide

[notes]
L2 LWAPP tunnel uses Ethertype 0xBBBB to encapsulate traffic between the AP and WLC.
L2 LWAPP does not provide corresponding CoS marking for Ethertype frames and is not able to provide transparent end-to-end QoS.

LWAPP control packet originates from UDP source port 12223
Control type 12 is the configuration command to a LWAPP AP by a WLC

AP groups do not allow multicast roaming across

MFP with WLC & LAP

[notes]
Client MFP is supported on v4.1.171.0 and above.
Version 4.0.2.206.0 provides optimal performance with MFP.

MFP adds a long set of information elements to each probe request or SSID beacon.  Some clients cannot process ths information and may not be able to assicate to an SSID with MFP enabled.

The AP addes a MIC IE to each management frame.
NTP must be used to ensure timestamp