Have to agree with that one. Explains it all quite well, can't see throughput being an issue
We run 2 drops anyway and always have but it's for other reasons, at only 20% more cost it's not that bad. For those thinking of redundancy where are most of the failures seen? We tend to have very few switch failures and almost all of them related to power(so the whole building is out anyway, and/or sometimes a switch PSU fails when it comes back up). Now with redundant hot swappable power supplies this is becoming less of a problem. So for us I think we would be more likely to try and go with UPS's for the switches rather than an extra switch with 2 ports per AP. Otherwise the best redundancy is diverse path, which means another comms room, cable path and different power source. The service would have to be pretty critical for those costs. -- Jason Cook The University of Adelaide, AUSTRALIA 5005 Ph : +61 8 8313 4800 e-mail: [email protected]<mailto:[email protected]> -----Original Message----- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:[email protected]] On Behalf Of Hurt,Trenton W. Sent: Wednesday, 12 February 2014 1:42 AM To: [email protected] Subject: Re: [WIRELESS-LAN] How many drops 802.11ac phase 2 Very good info in this article... http://www.theruckusroom.net/2014/02/will-80211ac-stab-you-in-the-backhaul.html -----Original Message----- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:[email protected]] On Behalf Of Cameron, Damien L. Sent: Tuesday, February 11, 2014 9:30 AM To: [email protected] Subject: Re: [WIRELESS-LAN] How many drops 802.11ac phase 2 Wouldn't switches with 10G access ports (also 10G uplink ports on AP)and 802.3at POE solve this issue? I understand resiliency is a plus with two data drops, but with RRM I still can't see the benefit of two data drops. Doubles cabling cost, and you still need the switch ports to support it. I've searched to see if Cisco had any switches with 10G access ports; however, I've only seen this in Nexus models for the DC. I think I came across a switch by Arista that was 10G access. And we know with the pace that technology changes those two data drops may not be needed in the future. Damien Cameron Network Engineer Norfolk State University Office of Information Technology Marie v. McDemmond Center for applied Research Room 401 555 Park Avenue Norfolk, VA 23504 O: (757) 823-9123 -----Original Message----- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:[email protected]] On Behalf Of John Center Sent: Tuesday, February 11, 2014 8:41 AM To: [email protected] Subject: Re: [WIRELESS-LAN] How many drops 802.11ac phase 2 Hi Bruce, I was referring to the future 802.11ac phase 2 APs. -John On 02/11/2014 07:40 AM, Osborne, Bruce W (Network Services) wrote: > What brand of APs are you using? Aruba APs will only accept PoE from the > first Ethernet port. > > Bruce Osborne > Network Engineer - Wireless Team > IT Network Services > > (434) 592-4229 > > LIBERTY UNIVERSITY > Training Champions for Christ since 1971 > > -----Original Message----- > From: John Center [mailto:[email protected]] > Sent: Monday, February 10, 2014 5:44 PM > Subject: Re: How many drops 802.11ac phase 2 > > Hi Philippe, > > Another reason for 2 drops is resiliency. I envision connecting the AP's 2 > ports to a 2-switch stack. We rarely see the need for redundant power > supplies in an edge switch, but have seen failure on a switch ASIC cause one > or more ports to go dead. With 2 connections, one switch having issues won't > take out the AP. I think LAG'g both ports across the stack & supporting LACP > will become a future requirement. > > -John > > > -- > John Center > Villanova University > > On 02/07/2014 10:21 AM, Hanset, Philippe C wrote: >> Is the main justification for two drops due to power/bandwidth/the-two? >> >> With many services and most killer apps going to the cloud, I would >> suspect that the bandwidth to the WAN is so limiting, that this >> excess of capacity on Wireless is a complete overkill (a vendor >> driven non-sense). >> >> Yes, those 802.11ac Phase2 APs can generate a lot more than 1 Gbps, >> but that's is shared bandwidth (half-duplex), and your uplink is 1 >> Gbps full-duplex (2 Gbps in Cisco math as we said in the old days). >> >> So, you really plan to also uplink your switches with 40 Gbps, and >> then a core at many times 100 Gbps, all connected to your ISP at a >> few Gbps... something doesn't add up here. >> >> Am I alone making bad accounting here? >> >> Philippe Hanset >> www.eduroam.us <http://www.eduroam.us> >> >> >> >> On Feb 7, 2014, at 9:58 AM, James Robert Kennon <[email protected] >> <mailto:[email protected]>> >> wrote: >> >>> We just made a call on a new building and decided not to incur cost >>> of >>> 2 cables per drop at this time. Hope we don't regret it later. >>> >>> >>> >>> From: Lee H Badman <[email protected] <mailto:[email protected]>> >>> Reply-To: The EDUCAUSE Wireless Issues Constituent Group Listserv >>> <[email protected] >>> <mailto:[email protected]>> >>> Date: Fri, 7 Feb 2014 14:56:31 +0000 >>> To: <[email protected] >>> <mailto:[email protected]>> >>> Subject: Re: [WIRELESS-LAN] How many drops 802.11ac phase 2 >>> >>> We'll be running two, until some sanity emerges. >>> >>> >>> >>> -------------------------------------------------------------------- >>> - >>> --- >>> *From:* The EDUCAUSE Wireless Issues Constituent Group Listserv >>> <[email protected] >>> <mailto:[email protected]>> on behalf of Brian >>> David <[email protected] <mailto:[email protected]>> >>> *Sent:* Friday, February 7, 2014 9:54 AM >>> *To:* [email protected] >>> <mailto:[email protected]> >>> *Subject:* [WIRELESS-LAN] How many drops 802.11ac phase 2 >>> >>> All, >>> >>> I wanted to see how many people were planning on running 2 drops to >>> 802.11ac phase 2 access points? >>> >>> Currently we are just doing a one for one swap when replacing an >>> older a/b/g AP's with 802.11ac phase 1 AP's >>> >>> When you have new construction, do you plan on running 2 drops so >>> when phase 2 come into play you will be all set for it? >>> >>> >>> >>> */Brian J David/* >>> >>> */Network Systems/* >>> >>> */Boston College/* >>> >>> <image003.jpg> >>> >>> >>> >>> ********** 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/.
