Hi Kristjan and Jason Thanks for your answers, but what I mean with "maximum" is not the absolute maximum of what the 802.1p value can be, but it maximizes the 802.11e UP value from the client to this value.
Let's say the value is set to 6 on the controller and the clients sends a packet with 802.11e UP = 6, then the controller will not change the value and will map this 802.11e UP value 6 to the AVVID IP DSCP value of 46 (EF), as you see in the link you sent: http://www.cisco.com/en/US/tech/tk722/tk809/technologies_configuration_examp le09186a00807e9717.shtml#intro But if the controller has set the 802.1p value to 0 and the same client sends a packet with 802.11e UP = 6 again, this value will be cut down to 0 and will then be mapped to the AVVID IP DSCP value of 0 (Best Effort). This is what I tried to say with "maximum" ;-) For the second question, I found some information in Jeromes Youtube video, starting at about 4 minutes 20 seconds: http://www.youtube.com/user/cciewireless#p/u/8/1gbbAFdsQdQ There he explain, that you can not enable "7920 Client CAC" (QBSSv1) togheter with "WMM Policy" (QBSSv2). But when you enable "7920 AP CAC", this seems also to be somewhat of QBSSv2. You can find the wireshark captures there, maybe you can interpret this better than me? Somehow confusing for me. Regards Dominic > Von: Kristján Ólafur E›var›sson <[email protected]> > Datum: Wed, 9 Feb 2011 00:02:28 +0000 > An: "[email protected]" <[email protected]> > Cc: Dominic Stalder <[email protected]> > Betreff: 1. Two questions about QoS (Stalder Dominic) > > Let me try this one Dominic. > > 1. I would say that zero is no the maximum value. I gather you want the higest > "value" that a packet > can have. For the QOS mapping table 802.1p 0 would be DSCP 0, or Best effort. > So Max would be 7 (lwapp control) or 6 (voice platinum) > Here is a very good reference on the QOS table mappings in wireless: > http://www.cisco.com/en/US/tech/tk722/tk809/technologies_configuration_example > 09186a00807e9717.shtml#intro > > BUT if you look at the help in the WLC gui just below the value. it says: * > the value 0 (zero) indicates that the feature is disabled. > So putting it to zero would not mark anything! right ? > > What I don´t understand, and would like to get some feedback on is: If you > look at the table 802.1p values. 0 is marked is Best effort (WLC Silver) > but 1 and 2 values are there for "background" in 802.1p. 802.11e "Background" > is worse than Silver (right?), so I don´t understand why the table > claims 1 and 2 for Background and 0 for silver. Anyone ? > > Regarding the "What happens.." section of you question. When you set value of > 6 in the WLC. You actually get mapped > to value 5. So from what you chose you always auto mapped one lower AVVID > 802.1p value. So in WLC use 6 when you want AVVID 5. > There isn´t anything that explains it in the GUI you just have to know. So i > guess, even though the value input is for 802.1p in the WLC, you > want to think from the 802.11e pespective. That is ask your self "what 802.11e > UP (user priority) value am I going to map from ?" That at least helps me... > This video with Jerome explains it preety > well.http://www.youtube.com/watch?v=5AHpIAEu3uQ&feature=related > > 2. I don´t have clue here. We better investigate. But I hope someone else > knows :D > > regards. Krisjan > > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Tue, 8 Feb 2011 08:59:43 +0000 > From: Stalder Dominic <[email protected]> > To: "[email protected]" > <[email protected]> > Subject: [CCIE Wireless] Two questions about QoS > Message-ID: <c976c48b.2e76%[email protected]> > Content-Type: text/plain; charset="us-ascii" > > Hi there > > I have two questions about QoS on the controllers: > > 1. If the 802.1p value under QoS profiles (for example Platinum) is set to 0, > will all LWAPP data pakets be marked with a DSCP value of 0. As I understand, > this is the maximum value, that a packet can have, if it falls within this > profile. > > But what happens, when I set the value to 6 (as recommended) and a WMM client > has a 802.11e UP value of 5. Will the LWAPP packet be forwarded with DSCP 5, I > think, or am I wrong? If it would be a non-WMM client, the value would be 6, > right? > > 2. Can QBSSv1 and QBSSv2 coexist? I think the can coexist on the controller, > but they CANNOT coexist within one WLAN. What would you say? > > Thanks and best regards > Dominic _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
