The packets being dropped on the way back to the AP because they're overrunning the 100M interface during peak wireless usage. You'll also notice if you do a speedtest that the download is much worse than the upload. We seen this disappear when we swap in a gig switch. - Don
On Wed, Dec 18, 2013 at 3:22 PM, Daniel Eklund <ekl...@umich.edu> wrote: > What is it you think is happening during output drops? > > -- > Daniel Eklund > Network Planning Manager > ITS Communications Systems and Data Centers > University of Michigan > 734.763.6389 > > > On Wed, Dec 18, 2013 at 3:11 PM, Wright, Don <donald_wri...@brown.edu> > wrote: > > I would say take a close look at the 100M ports connected to your N or AC > > APs and check for output drops. We've seen this in some locations where > we > > we're careful about refreshing with N AP's. It likely comes at peak > times > > so if you're just graphing the in/out you will miss it. > > > > Don Wright > > Brown University > > > > > > > > On Wed, Dec 18, 2013 at 2:39 PM, Ian McDonald <i...@st-andrews.ac.uk> > wrote: > >> > >> They certainly are using some strange math, my experience (and that of > >> other institutions nearby) is that the vast majority of my N access > points > >> don't suffer from being connected to 100M poe switches, and in the > places we > >> have 1G to them, they generally don't use more than 100M. > >> > >> > >> Thanks > >> > >> -- > >> ian > >> > >> Sent from my phone, please excuse brevity and misspelling. > >> ________________________________ > >> From: Hanset, Philippe C > >> Sent: 18/12/2013 19:33 > >> > >> To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU > >> Subject: Re: [WIRELESS-LAN] 802.11AC Future Infrastructure > >> > >> And the WLAN industry also does strange math ;-) > >> > >> A lot of services are going to the Cloud, mostly using your pipe to the > >> Internet. > >> It seems that, progressively or even rapidly, the limiting factor is not > >> Wi-Fi anymore but rather the pipe to the internet. > >> 1 Gbps to each Wireless AP is a lot of bandwidth! and a lot of > >> oversubscription all around (edge, distribution, core, WAN) > >> Unless you plan to distribute UHDTV (8K TV) to your dorms, I wouldn't > >> worry about getting more than 1 Gbps to each AP for a long time. > >> Also most of 802.11ac APs are fine with 802.3af! > >> > >> > >> Philippe Hanset > >> www.eduroam.us > >> > >> On Dec 18, 2013, at 12:56 PM, Lee H Badman <lhbad...@syr.edu> > >> wrote: > >> > >> The WLAN industry is doing an absolutely horrible, almost shameful job > of > >> managing the message on cabling for 11ac, says I. > >> > >> Lee Badman > >> Network Architect/Wireless TME > >> ITS, Syracuse University > >> 315.443.3003 > >> > >> -----Original Message----- > >> From: Turner, Ryan H [rhtur...@email.unc.edu] > >> Received: Wednesday, 18 Dec 2013, 12:52 > >> To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU > >> [WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] > >> Subject: Re: [WIRELESS-LAN] 802.11AC Future Infrastructure > >> > >> BTW… Before anyone jumps on me, I understand the purpose of the > question. > >> It’s great to know the best practices for the ‘what if’ situation. > >> > >> > >> > >> Ryan H Turner > >> Senior Network Engineer > >> The University of North Carolina at Chapel Hill > >> CB 1150 Chapel Hill, NC 27599 > >> +1 919 445 0113 Office > >> +1 919 274 7926 Mobile > >> > >> > >> > >> From: The EDUCAUSE Wireless Issues Constituent Group Listserv > >> [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Turner, Ryan H > >> Sent: Wednesday, December 18, 2013 12:47 PM > >> To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU > >> Subject: Re: [WIRELESS-LAN] 802.11AC Future Infrastructure > >> > >> > >> > >> Call me naïve, but I think 10 gig uplinks for ac WAPs is serious > overkill. > >> We have almost 4,500 switches across campus, most with 1 gig user > uplinks, > >> and the vast majority are perfectly fine with 1G (heck, we could swap a > good > >> number of those for 100 Meg, and they’d barely notice). These are > switches > >> with 48+ connected devices, all at 1 gig. So, for most access points > that > >> will be seeing far less users than a traditional edge switch with a one > gig > >> uplink, I don’t see the need to go crazy with the feed speed. I could > see > >> deploying 2 single gig links to the .ac access points, but not 10 gig. > >> Exceptions to this ‘could’ be very dense classroom environments with a > lot > >> of access points (there are exceptions to everything). > >> > >> > >> > >> Ryan H Turner > >> Senior Network Engineer > >> The University of North Carolina at Chapel Hill > >> CB 1150 Chapel Hill, NC 27599 > >> +1 919 445 0113 Office > >> +1 919 274 7926 Mobile > >> > >> > >> > >> From: The EDUCAUSE Wireless Issues Constituent Group Listserv > >> [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Stewart, Joe > >> Sent: Wednesday, December 18, 2013 12:40 PM > >> To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU > >> Subject: [WIRELESS-LAN] 802.11AC Future Infrastructure > >> > >> > >> > >> As this technology begins to be deployed is anyone out there planning > >> ahead for wave two of this? I know it’s not going to happen for a > while but > >> I’m curious if there are folks in the process of new construction where > you > >> have the option to add the infrastructure now to support the 10Gbps. > If so, > >> has there been any documentation on what cable type would be > recommended for > >> this? (ex. CAT6A or CAT7). > >> > >> > >> > >> Thanks, > >> > >> > >> > >> > >> > >> Joe Stewart > >> Network Specialist I > >> Information Systems and Network Services > >> Claremont McKenna College > >> 325 E. 8th Street, Roberts South #12 > >> Claremont, CA 91711 > >> > >> > >> > >> ********** Participation and subscription information for this EDUCAUSE > >> Constituent Group discussion list can be found at > >> http://www.educause.edu/groups/. > >> ********** Participation and subscription information for this EDUCAUSE > >> Constituent Group discussion list can be found at > >> http://www.educause.edu/groups/. > >> ********** Participation and subscription information for this EDUCAUSE > >> Constituent Group discussion list can be found at > >> http://www.educause.edu/groups/. > >> > >> ********** Participation and subscription information for this EDUCAUSE > >> Constituent Group discussion list can be found at > >> http://www.educause.edu/groups/. > >> > >> > >> ********** Participation and subscription information for this EDUCAUSE > >> Constituent Group discussion list can be found at > >> http://www.educause.edu/groups/. > >> > >> ********** Participation and subscription information for this EDUCAUSE > >> Constituent Group discussion list can be found at > >> http://www.educause.edu/groups/. > > > > > > ********** Participation and subscription information for this EDUCAUSE > > Constituent Group discussion list can be found at > > http://www.educause.edu/groups/. > > ********** > Participation and subscription information for this EDUCAUSE Constituent > Group discussion list can be found at http://www.educause.edu/groups/. > ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
