I will be following this thread because we have had user complaints of poor service too, even though the signal strength seems to be OK. We don't usually have your user/AP density though. For the most part we are 3620, with some 3710. The other difference is that we specify 40MHz channel-width on radio-1 (5GHz) and 20MHz width on the 2.4GHz band. Our theory is that allowing a wide channel-width on the congested 2.4GHz band may create interference and we are willing to live with the lower bandwidth there for 2.4GHz "n".
One thing that I have noticed in poking around is that the AP's seem to do a poor job of auto channel selection. While the primary channel (on the 40MHz wide radio-1) may be fine, in a significant number of cases the second "bonded" channel seems to have a problem (listed as "down" in the AP Inventory Report). When I manually locate a different primary channel that does successfully bond with its secondary, then everything seems fine, and these changes even "stick" between reboots. Our other observation is that an AP reboot seems to at least temporarily clear our problems, although doing that regularly is a pain. It is not clear to me if the channel-bonding issue is really "the answer", and we are still groping around on this. JD -----Original Message----- From: Eklund Kendt [mailto:[email protected]] Sent: Monday, September 16, 2013 8:28 AM To: Enterasys Customer Mailing List Subject: [enterasys] Best AP/Radio config for high client/AP density? I have an open GTAC case and am waiting for the standard Enterasys recommendations, but I'm curious what others have seen in the real world. We have had reports of client connection issues at one school with a heavy Mac deployment in a group of adjacent classrooms. Controller - C5110-2 firmware 8.31.03.0011 APs - 3610 - 1 per classroom Clients - MacAir OS X 10.8.4 (google search show other folks having WiFi issues if there is heavy channel interference), 33 per classroom. SSIDs - 2 deployed, one hidden, both using NAC/RADIUS for authentication Topology is Bridge@AP for these authenticated clients I've tried to push the config recommended from the help pages, but for some reason bulk AP radio configs are not sticking (I changed several of the ones listed below but looking at the current config they are not active). I did enable DCS in active mode and will be onsite to monitor today - current radio configs are: Radio 1: Admin Mode: On Radio Mode: a/n Channel Width: Auto Guard Interval: Short ATPC: Enabled Max Tx Power: 24 dbm Min Tx Power: 8 dbm Auto Tx Power Ctrl Adj: 0 dbm Channel Plan: All Non-DFS-Channels Ant Selection: L/M/R Advanced: DTIM Period: 5 Beacon Period: 100 RTS/CTS Threshold: 2346 Frag. Threshold: 2346 Maximum Distance: 100 Dynamic Channel Selection: Active Mode DCS Noise Threshold: -80 DCS Channel Occupancy Threshold: 100 DCS Update Period: 5 Min Basic Rate: 6Mbps Max % of non-unicast traffic: 100 Optimized for power save: unchecked Adaptable Rate: unchecked Multicast to Unicast delivery: Disabled Protection Mode: Always Protection Type: CTS only 40Mhz Channel Busy Threshold: 50 Aggregate MSDUs: Disabled Aggregate MPDUs: Disabled Aggregate MPDU Max Length: 65535 Agg. MPDU Max # of Sub-frames: 64 ADDBA Support: Enabled Radio 2: Admin Mode: On Radio Mode: b/g/n Channel Width: Auto Guard Interval: Long ATPC: Enabled Max Tx Power: 24 dbm Min Tx Power: 8 dbm Auto Tx Power Ctrl Adj: 0 dbm Channel Plan: 3-Channel Plan Ant Selection: L/M/R Advanced: DTIM Period: 5 Beacon Period: 100 RTS/CTS Threshold: 2346 Frag. Threshold: 2346 Maximum Distance: 100 Dynamic Channel Selection: Active Mode DCS Noise Threshold: -80 DCS Channel Occupancy Threshold: 100 DCS Update Period: 5 Min Basic Rate: 11 Mbps Max % of non-unicast traffic: 100 Optimized for power save: unchecked Adaptable Rate: unchecked Multicast to Unicast delivery: Disabled 11b: Preamble: Long 11g: Protection Mode: Auto Protection Rate: 11 Mbps Protection Type: CTS only 11n: Protection Mode: Always Protection Type: CTS only 40Mhz Channel Busy Threshold: 50 Aggregate MSDUs: Disabled Aggregate MPDUs: Disabled Aggregate MPDU Max Length: 65535 Agg. MPDU Max # of Sub-frames: 64 ADDBA Support: Disabled I could go back and set them based on the 'High Throughput' settings list from the controller online help, but I don't want ot just randomly change settings without further logging or the recommendations from GTAC. Thanks for any info! Kendt Eklund Executive Supervisor, Data Infrastructure Moore County Schools - Technology 180 Pinckney Rd. - Carthage, NC 28327 910-947-6672 Fax: 910-947-1808 Email: [email protected] --- To unsubscribe from enterasys, send email to [email protected] with the body: unsubscribe enterasys [email protected] --- To unsubscribe from enterasys, send email to [email protected] with the body: unsubscribe enterasys [email protected]
