yeah I saw the notes about the frame alignment. I set them all to "on mode1" which didn't seem to help.
after watching this for a couple more days it seems like what is happening is one AP on the tower will have a stack dump which causes other APs on the tower to register a DFS hit. then sometimes the DFS hit causes a stack dump in that AP. 14.1.1 has a lot of speed improvements but all the DFS hits that are now happening that didn't happen on 13.2.1 are causing issues. -Sean On Sun, Jan 24, 2016 at 5:02 PM, George Skorup <[email protected]> wrote: > Did you read release notes regarding the frame alignment thing? If you > didn't upgrade any 430 and 100 in the area, then you need to put the 450 > frame alignment into legacy mode. It shouldn't cause that many issues > non-colocated, but since you're still seeing some DFS hits here and there, > that could be the issue. > > And are you absolutely sure those APs could get sync over power before the > upgrade? That seems really odd to just lose that ability... unless they > changed something with power port pulse detection, which is entirely > possible. > > On 1/24/2016 2:58 PM, Sean Heskett wrote: > > alright so after digging into this and making some adjustments I think > i've got the DFS events settled down now. > > *1. Issue:* The 14.1.1 upgrade on PMP450 APs using the 5.4 band will > delete "Alternate Frequency Carrier 1" and "Alternate Frequency Carrier > 2". > *Fix:* I had to log into each AP and manually add the 2 alternate > channels back into the APs. This way when we have a DFS event the AP will > move to another channel. Since the upgrade had deleted the 2 alternates > the AP would shutdown for 30min. > > *2. Issue: *The tower that was having the most DFS issues has 11 PMP450 > APs and It's a commercial tower with a lot of FM stations etc. All APs are > connected to a CTM2 however after the upgrade half the APs were getting > sync from the CTM2 over the power port and half didn't see any sync on the > power port. > *Fix: *after reading other reports of the 450s having weird sync > issues (causing other issues besides DFS events) I decided to force all 11 > APs to use the onboard GPS and I turned off the power port timing and > timing port timing to achieve this. So now all APs at this tower are > receiving sync from the onboard GPS. > > *3. Issue:* Somewhere along the line (13.x) cambium made it so that a > 450AP in the 5.4 band couldn't be set to more than 75% downlink. We > originally had them set for 85% downlink and they were timed with our 430 > APs. Well when cambium forced the change without any notification suddenly > our 450 APs were out of time with our 430 APs. The area that this problem > tower is located we had removed all the 430 APs and moved them to smaller > towers at the edge of our network so I didn't think we'd have any timing > issues since there were mountains blocking the signals. However there was > one tower with 430s still on it that was ~7 miles from this problem tower. > *Fix:* I changed the 430 timing to match the 450 timing at the > problem tower. > > after running this weekend with the new settings I've only had 1 DFS event > where as before these fixes the were a couple APs having DFS events 2-5 > times a day. > > In conclusion it seems like 14.1.1 is WAY more sensitive in regards to > timing sources. Also 14.1.1 doesn't seem to reliably receive sync over > power. Again when were were on 13.2.1 we didn't have any of these issues. > 14.1.1 introduced some timing and DFS issues but they are somewhat > manageable (i really hate turning off a sync source because it'd be nice to > have it as a backup). It seems like if a nearby AP is out of sync that > will trigger a DFS event. > > 2 cents. I'll report again in a few days to see if these fixes have > eliminated the DFS events. > > -Sean > > > > On Wed, Jan 20, 2016 at 5:41 PM, Sean Heskett <[email protected]> wrote: > >> I will be opening a ticket with cambium but I wanted to let everyone know >> this issues we just came across. >> >> I updated all our 450 APs to 14.1.1 yesterday. On our 5Ghz 450s we use >> the 5.4 band. On all these APs the "Alternate Frequency Carrier 1" and >> "Alternate Frequency Carrier 2" were reset to "none". when I go and set >> them back to what they should be, save and reboot they still come back as >> "none". >> >> Because of this if we experience a DFS event we have no other frequency >> to hop to. >> >> Additionally we have a couple APs that after the upgrade are now seeing >> DFS events when previously they experienced no events...ever. We live in >> the middle of the rocky mtns. so there really shouldn't be any events >> because of all the granite clouds in the way ;-) >> >> anyway, DFS seems to be broken on 14.1.1 and I wanted to let everyone >> know before they apply the upgrade incase you need DFS to work properly. >> >> -Sean >> >> > >
