Wireless STM-1 link

Rens rens at autempspourmoi.be
Wed Sep 23 14:43:57 UTC 2009

When I do a lot of pings with small packet size I get drops.

I'm think this is because of the flow control that I activated and the link
can't handle it this fast and drops them.

This at least is what the vendor says => dropping the low priority ping
packets is normal behavior.


I have the ability to enable 802.1p on the link, is there a way to
prioritize the OSPF hello packets with this?



From: Kenny Sallee [mailto:kenny.sallee at gmail.com] 
Sent: jeudi 10 septembre 2009 18:06
To: Rens
Cc: Adam Goodman; nanog at nanog.org
Subject: Re: Wireless STM-1 link


On Thu, Sep 10, 2009 at 2:55 AM, Rens <rens at autempspourmoi.be> wrote:

All the interfaces are forced to 1Gbps and full duplex.

Maybe I should give some extra info.
All the traffic seems to pass ok via that link but I have seen that often
OSPF adjacencies go down/up , I suspect that the HELLO packets are being
dropped that pass via that link.

That's why I started to look a little deeper and do some ping tests.

-----Original Message-----
From: Adam Goodman [mailto:adam at wispring.com]
Sent: jeudi 10 septembre 2009 11:45
To: Rens
Cc: <nanog at nanog.org>
Subject: Re: Wireless STM-1 link

Sounds like this might be an Ethernet negotiaton problem

Sent from my phone


Seems everyone has focused on GE as the problem.  You can quickly rule that
out by looking at interface error counters and doing PING tests from the
wireless router/device to something on the local network on both sides.  If
OSPF is flapping because of missed HELLO packets then I'm thinking you have
a problem with either saturation on the link or actual wireless issues.
When PING does work what do the times look like? I'd look at static routing
for a bit (if practical) or changing your OSPF HELLO intervals to see if
that does anything.  Here's a good link on troubleshooting OSPF adjacency


More information about the NANOG mailing list