On Tue, 7 Feb 2012, Ann Kwok wrote:

Thank you for your help

But we can't increase the pipe as we are using 10G switch.

The congestion happens when the traffic is using 7G

Any idea?

In addition, how to determine the congestion happens in router or switch.

Different manufacturers and platforms have different ways of indicating the presence of congestion. Some will not explicitly report it, so you end up having to go back and look at performance statistics on your devices (per-interface traffic, overall traffic and/or traffic per ASIC group, CPU/memory/buffer utilization, link errors, overruns, etc). Whichever manufacturers you use will likely have lots of resources available through their websites/support channels for troubleshooting congestion. I'm going to go out on a limb here and take a guess that Ann = Deric, using a different address? jms

On Mon, Feb 6, 2012 at 4:56 PM, Fabien Delmotte <fdelmotte1@mac.com> wrote:

...

Hi Forget flow control, because you will use buffer and at the someone will not understant pause frame. Another issue is : with pause frame you block all the traffic from the outbound port ... So very dangerous. Best way : big pipe.

Regards

Fabien

Envoyé de mon iPad

Le 6 févr. 2012 à 22:41, Ann Kwok <annkwok80@gmail.com> a écrit :

...

Hello

There is big congestion between router and switch

I read some documents about flowcontral

Do I disable or adjust flowcontral at the same?

Can flowcontral solve the congestion issue?

How can I adjust flowcontral in cisco router and HP switch?

Thank you so much

"increase pipe" = port trunking/etherchannel/port bonding whatever your supplier calls it. just use 2 or 4 ports instead of just one. ieee 802.3ad/lacp/link aggregation, etc.... all the same stuff. ;) provided you have another interface on/for your router ofcourse (your switch probably has plenty ;) also an option (for cisco)... int gix/x/x max-reserved-bandwidth 1 (i'd say, 1% of 10ge should about cover all the needs for inband layer-2 related stuff as a few kbit/s already should suffice ;) 1% being the minimum you can set this to. -- Greetings, Sven Olaf Kamphuis, CB3ROB Ltd. & Co. KG ========================================================================= Address: Koloniestrasse 34 VAT Tax ID: DE267268209 D-13359 Registration: HRA 42834 B BERLIN Phone: +31/(0)87-8747479 Germany GSM: +49/(0)152-26410799 RIPE: CBSK1-RIPE e-Mail: sven@cb3rob.net ========================================================================= <penpen> C3P0, der elektrische Westerwelle http://www.facebook.com/cb3rob ========================================================================= Confidential: Please be advised that the information contained in this email message, including all attached documents or files, is privileged and confidential and is intended only for the use of the individual or individuals addressed. Any other use, dissemination, distribution or copying of this communication is strictly prohibited. On Tue, 7 Feb 2012, Randy McAnally wrote:

On Tue, 7 Feb 2012 08:32:21 -0500, Ann Kwok wrote

...

Hello

Thank you for your help

But we can't increase the pipe as we are using 10G switch.

The congestion happens when the traffic is using 7G

If you cannot increase bandwidth, then you must increase the TX queue (in QOS and/or port buffer).

~Randy