Rackshack has some strange traffic graphs at http://www.rackshack.net/aboutus/networks.asp
it shows the Cogent line dropping to 0 Megabit / Sec than coming back up again. This happened twice already and is wierd. No support person in the rackshack IRC chan seemed to have any official comment on what was going on. Is this a problem with the entire cogent network or rackshack?

It could be just the Cogent network going down for a sec.

Just routing. If you look closely, you will see it corresponds to spikes in the other pipes.

i asked about this in rs forums. got the following reply

http://forum.rackshack.net/showthread.php?s=&threadid=1378

I think that I've responded in this forum and our own forum on this issue. But, here goes again.

Cogent is deliveded to RS via a Time Warner Gig-E loop. There appears to be some intermitent failure that causes the loop to drop.

Cisco, Luxend (sp?) and Juniper are conferencing to try and determine what causes the circuit to drop and not immediately come back up. As soon as Cogent cycles their interface, the loop comes back.

This is the reason that we have not released our 10 MB unmetered servers and that we are bringing up another Gig-E to XO to ensure that we have enough spare capacity in the event we lose one of the Gig-E circuits.

I feel confident that between Juniper, Cisco, Luxend (sp?), Cogent, and Time Warner will find what is causing this error.

Robert Marsh
Head Surfer Rackshack.net

Originally posted by headsurfer
Cisco, Luxend (sp?) and Juniper are conferencing to try and determine what causes the circuit to drop and not immediately come back up. As soon as Cogent cycles their interface, the loop comes back.

This is the reason that we have not released our 10 MB unmetered servers and that we are bringing up another Gig-E to XO to ensure that we have enough spare capacity in the event we lose one of the Gig-E circuits.


"Lucent" is probably who you're looking for. They build fiber multiplexers, among other things. Lots of telco fiber equipment is Lucent, Nortel, or Fujitsu.

Does cycling your end help at all, or only their end?

Are you getting that other loop on a different fiber provider?

Just friendly curiosity.

Kevin

I work in the hardware biz, and know the equip very well.

He meant LuxN. They are a low-cost piece of equipment people like Cogent and MFN, and many other carriers use to get short distances from point A to point B over fiber.

Basically eth, fast-e, gige, X media to CWDM or DWDM. An "on ramp" if you will, to their backbone. Most likely the WW product.

Yes, NT and LU have competiting equipment in terms of technology, but not pricing, compared to the LuxN stuff.

TomK

Originally posted by TomK
He meant LuxN. They are a low-cost piece of equipment people like Cogent and MFN, and many other carriers use to get short distances from point A to point B over fiber.

Basically eth, fast-e, gige, X media to CWDM or DWDM. An "on ramp" if you will, to their backbone. Most likely the WW product.

Yes, NT and LU have competiting equipment in terms of technology, but not pricing, compared to the LuxN stuff.

TomK

OK, so it's a mini-mux. Not something you're likely to see from the big telcos. Thanks for the tip.

Kevin