Tim,
Obviously you want to fix the radio issue but I can give you a little
advice on LACP.
The switch (or router) doing LACP can take various headers into account
when doing the 'hashing' to decide how to send the flows. If LACP is
what you are stuck with (Gino suggested a layer 1 method) and you have
control over the devices doing LACP take a look at the LACP Hashing
options. Typical options are MAC SRC/DST, MAC Src/Dst + L3 port, or
some other options. If most of your traffic is flowing between two
interfaces (a router at each end) the MAC src/dst hashing sends
everything over one of the links. You want to find a hashing method
that has more randomness to it. In at least one case where we use that
we had to resort to not using the LACP functionality the radio
manufacturer provided and use the better LACP options in our Juniper and
Cisco switches in order to make the traffic balance on the interfaces.
Mark
On 10/24/14, 12:38 PM, Timothy D. McNabb via Af wrote:
We have now been able to trace to the heart of the problem, though
unfortunately still attempting to determine the cause. To give you a
rough background, we have a main link that “bonds” 2 Dragonwaves
together to form one unit (using the dual radio mount). The DW manual
states for this to work when doubling the throughput, it is required
to use LACP trunking. We have this in place and it has been working
fine up until recently. The trunk is still active (no network loop)
however one radio is working more than the other, eventually
saturating one of the two links and causing the latency. The second
set of radios aren’t performing in terms of actual traffic (signal is
ok) but at most they’ve moved 200Mb/s even though they are licensed
for 400Mbs.
The link with the LACP has more or less load-balanced itself in the
past, however they are now performing very asymmetrical at this point
with over a 200Mb/s difference. I understand that LACP does not
actively load balance but that’s what has been observed in the past. I
suspect the issue is being caused by one of the switches doing the
trunking (we just discovered it is unmanageable but still operating,
again no network loop). It’s either that or the one leg of the link
itself with the low bandwidth usage is not working properly despite
indications otherwise.
We’ll investigate our theories but always looking for additional input J
-Tim
*From:*Af [mailto:[email protected]] *On Behalf Of *Josh Reynolds
via Af
*Sent:* Thursday, October 23, 2014 1:47 PM
*To:* [email protected]
*Subject:* Re: [AFMUG] Dragonwave latency issues
You can do a bit more with metro-e style NIDS... those have the layer2
tools to do proper testing.
Josh Reynolds, Chief Information Officer
SPITwSPOTS, www.spitwspots.com <http://www.spitwspots.com>
On 10/23/2014 12:37 PM, Eric Kuhnke via Af wrote:
it's going to be really hard to do any meaningful diagnostics with
a layer 2 switch on each end, not routers... you could be seeing
a broadcast flood of some type.
On Thu, Oct 23, 2014 at 1:10 PM, Timothy D. McNabb via Af
<[email protected] <mailto:[email protected]>> wrote:
Unfortunately there is no QoS and flow control is off on the
switches L
Dragonwave was contacted as well. No determination yet though.
-Tim
*From:*Af [mailto:[email protected]
<mailto:[email protected]>] *On Behalf Of *Peter Kranz via Af
*Sent:* Wednesday, October 22, 2014 1:36 PM
*To:* [email protected] <mailto:[email protected]>
*Subject:* Re: [AFMUG] Dragonwave latency issues
Backpressure from the switches in terms of flow-control can show
as latency on dragonwave links.
Disable any QOS features on the dragonwave if you are using them.
Email dragonwave support
*Peter Kranz
*Founder/CEO - Unwired Ltd
www.UnwiredLtd.com <http://www.unwiredltd.com/>
Desk: 510-868-1614 x100
Mobile: 510-207-0000
[email protected] <mailto:[email protected]>
*From:*Af [mailto:[email protected]] *On Behalf Of *Timothy D.
McNabb via Af
*Sent:* Wednesday, October 22, 2014 1:15 PM
*To:* [email protected] <mailto:[email protected]>
*Subject:* Re: [AFMUG] Dragonwave latency issues
No routers between, just switches.
-Tim
*From:*Af [mailto:[email protected]] *On Behalf Of *Paul Conlin
via Af
*Sent:* Wednesday, October 22, 2014 12:22 PM
*To:* [email protected] <mailto:[email protected]>
*Subject:* Re: [AFMUG] Dragonwave latency issues
Could the routers at each end be the limiting factor? What is
their CPU utilization when the link is loaded? What happens to
latency if you stress the link at 200 Mbps with a speed test?
Those radios should be able to do close to 400 Mbps all day long
with no latency.
PC
Blaze Broadband
*From:*Af [mailto:[email protected]] *On Behalf Of *Joshua
Heide via Af
*Sent:* Wednesday, October 22, 2014 3:06 PM
*To:* [email protected] <mailto:[email protected]>
*Subject:* Re: [AFMUG] Dragonwave latency issues
Yes it’s a horizon compact
Bandwidth of the unit is 400mbs
Bandwidth usage between 150-200mbs during peak hours.
No QOS
Yes during non-peak hours its sits at 1ms
SNR 35.00 dB
From our prtg graphs this issues has started end of September and
latency has gotten worse during peak times as we have deployed
more 450 gear to that tower.
I currently have HAAM enabled on the link and it stays at 256qam
unless we have some bad weather.
Josh Heide
Velociter Wireless
(office) 209-838-1221
(fax) 209-838-1800
www.velociter.net <http://www.velociter.net/>
*From:*Af [mailto:[email protected]] *On Behalf Of *Bill Prince
via Af
*Sent:* Wednesday, October 22, 2014 11:47 AM
*To:* [email protected] <mailto:[email protected]>
*Subject:* Re: [AFMUG] Dragonwave latency issues
So it's a Horizon Compact?
What is the total bandwidth, and what percentage are you using?
Have you set up any QOS? 180 ms sounds like a lot; especially
when ours are typically less than 1 ms.
-38 is right in the game. What are the other parameters besides
signal level?
bp
On 10/22/2014 11:18 AM, Joshua Heide via Af wrote:
We have a dragonwave that has latency issues that coincide
with traffic peak times. As our traffic peaks so does that
latency at 180ms. Any ideas that could cause this?
Signal is -38
Current HAAM Mode hc50_364_256qam
Thanks,
Josh Heide
Velociter Wireless
(office) 209-838-1221
(fax) 209-838-1800
www.velociter.net <http://www.velociter.net/>
--
Mark Radabaugh
Amplex
[email protected] 419.837.5015 x 1021
