FYI, I'm working with our support for the OSL on this. We are banning the users and we are also going to set emails from new users to be moderated. I think that's our best course of action at the moment, although new users will have some delay getting their messages out.
Jeff Rensink - CCIE #24834 (Wireless, R&S) Senior Technical Instructor - IPexpert On Fri, Sep 13, 2013 at 5:46 AM, tabitha soans <[email protected]> wrote: > We are really chatting great let us know if you also want to join and > learn something from it.! > > Anyone interested to work together i have scheduled my attempt and want to > discuss rea lab we can do it add me on skype > > thanks > > > On Fri, Sep 13, 2013 at 1:37 AM, Jason Boyers <[email protected]> wrote: > >> Can someone block this guy? Not for hijacking a question (which is >> rude), but the idea of "rea l lab questions" smells of "actual lab >> questions" which is illegal and can be cause for removal of your Cisco >> certifications and blocking from obtaining the CCIE. >> >> Jason Boyers, CCIE #26024 (Wireless) >> Blog: netboyers.wordpress.com >> >> >> On Thu, Sep 12, 2013 at 3:47 PM, john arther <[email protected]>wrote: >> >>> Hi, >>> >>> If anyone want to pass CCIE WIRELESS LAB then lets discuss on rea l lab >>> questions and work on it lets break the lab share the questions and >>> solutions >>> >>> Add me on skype id is (*quad.quad4*) >>> >>> Thanks >>> >>> >>> On Thu, Sep 12, 2013 at 7:17 PM, Jeen Sern Chew <[email protected]>wrote: >>> >>>> Thanks Jason and Jeff, >>>> >>>> It is really confusing, especially with conflicting information out >>>> there, like with the hysteresis of being 3 dBm both ways or 3 dBm one and >>>> 6dBm the other. >>>> >>>> Also after calculating, how would you know to increase or decrease the >>>> power? >>>> >>>> The following is how I understand it after some thinking. Some of the >>>> figures are just base on real world experience. Say you do a voice survey >>>> and place your APs to provide coverage of -67 dBm, 20% overlap and power >>>> level of 6-25 mW. The following are the assumptions: >>>> - Cisco formula as mentioned above is correct >>>> - TPC only decreases power >>>> - Hysteresis of 3 dBm >>>> - There's another APs see each other rather than by transmitting >>>> neighbour message at full power >>>> >>>> Starts off at level 1 / 100mW. I chose the 3rd highest RSSI to be -50 >>>> dBm as that would happen in a voice/high density survey. >>>> >>>> 20 - (-67 - (-50)) = 20 - (-17) = 37 Hysteresis met, decrease >>>> from level 1 / 20dB to level 2 / 17dB >>>> 20 - (-67 - (-60)) = 20 - (-7) = 27 Hysteresis met, >>>> decrease from level 2 / 17dB to level 3 / 14dB >>>> 20 - (-67 - (-70)) = 20 - 3 = 17 Hysteresis met, >>>> decrease from level 3 / 14dB to level 4 / 11dB >>>> 20 - (-67 - (-80)) = 20 - 13 = 7 Hysteresis met, >>>> decrease from level 4 / 11dB to level 5 / 9dB >>>> 20 - (-67 - (-85)) = 20 - 18 = 2 Hysteresis not met. >>>> Stay at level 5 / 9dB >>>> >>>> At level 5, it is close to the figures of some deployments out there. >>>> >>>> Does this calculation make sense? Did I miss anything? If it correct, >>>> great! Just need to confirm the assumptions above then. >>>> >>>> Thanks >>>> J Chew >>>> >>>> >>>> On 12 September 2013 01:39, Jeff Rensink <[email protected]> wrote: >>>> >>>>> This is a frustrating topic indeed. >>>>> >>>>> TPC will do both power decreases and increases as the environment >>>>> changes. But the formula that the document references has a flaw that I >>>>> haven't totally reconciled. >>>>> >>>>> Tx_Max for given AP + (Tx power control thresh – RSSI of 3rd highest >>>>> neighbor above the threshold) >>>>> >>>>> Tx_Max for a given AP should be a static value, correct? It's >>>>> supposedly the max possible power that the radio can transmit at for its >>>>> chosen channel. The Tx power control threshold is also a static value >>>>> that >>>>> is configurable. So the assumption is that the RSSI of the 3rd loudest >>>>> neighbor changes along with the current AP power level. >>>>> >>>>> If I understand things correctly, the RSSI of the 3rd loudest neighbor >>>>> is determined by AP neighbor messages. According to documentation (and I >>>>> believe I've tested this myself), neighbor messages are always sent out at >>>>> the highest power level and lowest data rate. If that is indeed true, >>>>> then >>>>> the RSSI of the third loudest neighbor is yet another static value >>>>> (assuming the environment isn't changing). >>>>> >>>>> So if none of the variables in the equation are actually variable, the >>>>> results of the equation are always the same. That would mean either the >>>>> power level would always settle into the max power or the minimum power. >>>>> That's not true, so something seems off in the equation or the >>>>> description >>>>> of the variables in the equation. >>>>> >>>>> My guess is the formula is closer to (Max_AP_Power - Current_AP_Power) >>>>> - (3rd_loudest_neighbor - TPC_Threshold) >>>>> >>>>> A positive result would result in a power increase. A negative result >>>>> would result in a power decrease based on the 3 dBm hysteresis. According >>>>> to Jerome Henry, it's 3 dBm in both directions in the 7.0.116.0 code. >>>>> This >>>>> assumes that the 3rd loudest neighbor measurement is pretty much always >>>>> the >>>>> same since neighbor messages are always sent as max power. >>>>> >>>>> So let's say we start at full power on the 2.4 GHz band with a 3rd >>>>> loudest neighbor of -60 and threshold of -67. >>>>> >>>>> (20-20)-(-60-(-67)) = 0-7 = -7 >>>>> >>>>> -7 is lower than -3, so we drop the power down a level >>>>> >>>>> (20-17)-(-60-(-67)) = 3 - 7 = -4 >>>>> >>>>> -4 is lower than -3, so we drop the power once more. >>>>> >>>>> (20-14)-(-60-(-67)) = 6 - 7 = -1 >>>>> >>>>> -1 is not lower than -3, so it doesn't change. >>>>> >>>>> This is a total guess, but it makes more sense to me than the formula >>>>> in the documentation. But in the real world, the higher the TPC >>>>> threshold, >>>>> the higher the power levels will be. For instance, a threshold of -60 >>>>> would result in higher power levels than a threshold of -70. So if you >>>>> are >>>>> seeing your APs in a particular location settle in at too high or too low >>>>> of power levels on average, tweak the threshold as needed. Every >>>>> increment >>>>> of 3 should result in powers going up/down one level on average. >>>>> >>>>> Jeff Rensink - CCIE #24834 (Wireless, R&S) >>>>> Senior Technical Instructor - IPexpert >>>>> >>>>> >>>>> On Wed, Sep 11, 2013 at 9:14 AM, Jason Boyers <[email protected]>wrote: >>>>> >>>>>> This is a confusing algorithm. Basically, think of it this way: >>>>>> >>>>>> 1) Three neighbors (at least) hear an APs radio at or stronger than >>>>>> the TPC Tx mac value configured under the WLC TPC settings for that PHY >>>>>> (802.11a/n or 802.11/b/g/n) >>>>>> 2) If #1 is true, then that formula provided is used. >>>>>> - The "Tx_Max for given AP" is the maximum transmit power for that >>>>>> channel on that particular radio. So, for a 2.4GHz radio, that would be >>>>>> 100mW (20 dBm), since that is the maximum for 802.11b. 5GHz is more >>>>>> confusing, as it various based on channel and model of AP. >>>>>> - The "Tx power control thresh" is the value that is entered in the >>>>>> WLC >>>>>> - Note that there is an "hysteresis" value of 3dB for decreasing and >>>>>> 6dB (or it was at one point - someone correct me for the current values) >>>>>> for increasing the power levels. In other words, the value that is given >>>>>> at the end of the formula has to be at least that dB difference from the >>>>>> current value in order for a change to occur. >>>>>> 3) The AP's radio that is heard by the other three APs is the one >>>>>> that is decreased (or it can be increased) if the hysteresis value is >>>>>> exceeded. >>>>>> 4) When the formula is run again, it is presumed that the three >>>>>> neighbors that are hearing the APs signal are hearing a weaker signal. >>>>>> 5) Keep in mind that the algorithm is always from the perspective of >>>>>> an AP being heard by 3 or more neighbors, not an AP hearing 3 or more >>>>>> neighbors. >>>>>> >>>>>> Hope this helps. >>>>>> >>>>>> Jason Boyers, CCIE #26024 (Wireless) >>>>>> Blog: netboyers.wordpress.com >>>>>> >>>>>> >>>>>> On Wed, Sep 11, 2013 at 9:36 AM, Jeen Sern Chew >>>>>> <[email protected]>wrote: >>>>>> >>>>>>> Hey guys, >>>>>>> >>>>>>> I have a TPC question. >>>>>>> >>>>>>> There are many conflicting information from different Cisco docs. >>>>>>> Some say TPC increase and decrease power, some say TPC only decreases >>>>>>> power >>>>>>> while CHD increases power. Does TPC do both or only increase? >>>>>>> >>>>>>> Also Cisco gives the TPC formula of: >>>>>>> Tx_Max for given AP + (Tx power control thresh – RSSI of 3rd highest >>>>>>> neighbor above the threshold). >>>>>>> >>>>>>> Is the Tx_Max is the Tx_Max of the specific AP? or Is it the Tx_Max >>>>>>> configured on under TPC in WLC? >>>>>>> >>>>>>> Also, when the calculation is done, I am assuming the power >>>>>>> increase/decrease occurs on the neighbour with the third highest RSSI? >>>>>>> >>>>>>> Thanks >>>>>>> >>>>>>> Regards, >>>>>>> J Chew >>>>>>> >>>>>>> _______________________________________________ >>>>>>> For more information regarding industry leading CCIE Lab training, >>>>>>> please visit www.ipexpert.com >>>>>>> >>>>>>> Are you a CCNP or CCIE and looking for a job? Check out >>>>>>> www.PlatinumPlacement.com >>>>>>> >>>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> For more information regarding industry leading CCIE Lab training, >>>>>> please visit www.ipexpert.com >>>>>> >>>>>> Are you a CCNP or CCIE and looking for a job? Check out >>>>>> www.PlatinumPlacement.com >>>>>> >>>>>> >>>>> >>>> >>>> _______________________________________________ >>>> For more information regarding industry leading CCIE Lab training, >>>> please visit www.ipexpert.com >>>> >>>> Are you a CCNP or CCIE and looking for a job? Check out >>>> www.PlatinumPlacement.com >>>> >>>> >>> >>> _______________________________________________ >>> For more information regarding industry leading CCIE Lab training, >>> please visit www.ipexpert.com >>> >>> Are you a CCNP or CCIE and looking for a job? Check out >>> www.PlatinumPlacement.com >>> >>> >> >> _______________________________________________ >> For more information regarding industry leading CCIE Lab training, please >> visit www.ipexpert.com >> >> Are you a CCNP or CCIE and looking for a job? Check out >> www.PlatinumPlacement.com >> >> > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com > >
_______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com
