, 2008 2:35 PM
To: mike
Cc: nanog@nanog.org
Subject: Re: high latency ds3 issue on unloaded line
We've had a similar issue with a few of our Qwest DS3's. The solution
has been 1 of the following
1) Qwest has over-provisioned the transit links on their atm network
that the DS3
Mike,
I've seen issues similar to this when using the 12 Port DS3 cards, Engine
O, in Cisco GSR's. Basically if there's any single ds3 that is full on any
of the 12 ports, then the buffers on the card fill up and every other port
on that card has their traffic queued, thus introducing latency.
I am wondering if the packets might be MD5 packets addressed to your router.
They might be small with no valid content but your router gets busy validating
the MD5 sum for each packet before the router then drops the packet. That
keeps the router busy doing nothing useful. Did you check your CPU
Mike,
Your latencies which suddenly appear for several hours and then go away and do
this on a regular basis sounds like a layer 2, facility switching issue. As
you indicated the problem comes on during the day and then lets up late in
the evening sounds like the under lying facility is
John
Even if this is happening, the distance you can travel at 2/3 sol says
there is something else going wrong here (1 sec latency is a very long
time).
Kris
On Sep 26, 2008, at 11:59 AM, John Lee wrote:
Mike,
Your latencies which suddenly appear for several hours and then go
away
John Lee wrote:
Mike,
Your latencies which suddenly appear for several hours and then go away and do this on a regular basis
sounds like a layer 2, facility switching issue. As you indicated the problem comes on during the day
and then lets up late in the evening sounds like the under lying
of the
lengthening delay and what other activity event would correlate with it.
John
From: kris foster [EMAIL PROTECTED]
Sent: Friday, September 26, 2008 3:17 PM
To: John Lee
Cc: mike; nanog@nanog.org
Subject: Re: high latency ds3 issue on unloaded line
We've had a similar issue with a few of our Qwest DS3's. The solution
has been 1 of the following
1) Qwest has over-provisioned the transit links on their atm network
that the DS3 is riding and the during peak times of the day, the
transit link becomes congested causing high latency
, September 26, 2008 2:35 PM
To: mike
Cc: nanog@nanog.org
Subject: Re: high latency ds3 issue on unloaded line
We've had a similar issue with a few of our Qwest DS3's. The solution
has been 1 of the following
1) Qwest has over-provisioned the transit links on their atm network
that the DS3
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