Hi Levi,
I'm seeing the loss on traffic going from 4200 to 4500.
(Whether it's egress of the 4200 or 4500 ingress, i'm not sure).

I'm not 100% sure I know what the infrastructure looks like now-- are there two 4500's?

As to whether there's loss to one of the "remote" switches, I'm not sure....
If one of the Neutral Path/Mankato Networks/ CNS connected participants would be up for running iperf for a little while, we could find out fairly quickly.

~Matthew

Matthew Beckwell - V.P. - Network Operations
Advanced Integrated Technologies
Office: +1.952.829.5511 x204
E-Mail: [log in to unmask]


On Mon, Sep 19, 2016 at 1:43 PM, Levi Pederson <[log in to unmask]> wrote:
Mathew,

Is the dropped traffic crossing the Exchange from the 4200 to one of the other switches or is it random?

Thank you,


Levi Pederson
Mankato Networks LLC


On Mon, Sep 19, 2016 at 1:37 PM, Matthew Beckwell <[log in to unmask]> wrote:
Greetings,
I wanted to see if anyone here has any thoughts on a small amount (<1%) of packet loss I've been trying to chase down, specific to the MICE EX4200 switch.

Aitech/AS13746 has a 1G copper port on the EX4200 switch.  It seems that we're seeing a small amount of outbound packet loss (1G to 10G) going participants outside of the EX4200 switch.

I might expect this going from 10G to 1G (inbound for us), but it's the opposite where we see the problem: 1G to 10G participants.

Doug at ipHouse (ge-1/0/3 on the EX4200) fired up iperf and we did some testing. They're in the same situation: Loss leaving the EX4200.  Specifically, I was testing over to US Internet (xe-0/0/14) but seeing it via Onvoy as well.

The iperf test I was running was UDP, bandwidth of 69000, and packet size of 172, running in both directions.  Essentially--emulating a G.711 SIP call (which is how I noticed the loss).  I tested with no loss in both directions within the EX4200.

Doug mentioned:

>I pulled the VC chassis stats, but it has nothing for drops or re-transmits for it.

Maybe some of our Juniper-centric members have suggestions?  It's quite possible it's always been like this-- the loss is small enough that's managed to evade monitoring.  I suspect everyone on the EX4200 is affected.

~Matthew


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