Re: BECN s on Frame-Relay
BECNs are mesages from the network; sourced by the network switches which the telco has control over, they are used to inform end devices or frame-relay subscribers (like yourself) that they (the telco switch) have entered a congested state. If elevated traffic levels continue the switch will begin to relieve congestion by selectively discarding frames with the DE (discard eligible) bit set to one. In other words these messages (BECNs) are intended to make users aware of a possible degraded network state. Its a warning (from the Telco) saying if you're over utilizing your link, back off because we're gonna have to start dropping frames if this congestion doesn't subside. If you notice continual accrual of BECNs causing you grief (delays, latency etc) you might want to get the telco to reconfigure your path (PVC) through their network. At 09:26 AM 09/25/2000 -0700, Patrick Stiever wrote: >Ladies and Gentlemen, > > I have question on BECN s on a Frame-Relay Link. What would I have >to configure on the Routers to eliminate them, would it be a matter of >setting up buffers? Any info would be helpful. Thanks. > > >Patrick Stiever >Communications Engineer >24 Hour Fitness >(760) 918 4459 >[EMAIL PROTECTED] > >**NOTE: New CCNA/CCDA List has been formed. For more information go to >http://www.groupstudy.com/list/Associates.html >_ >UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html >FAQ, list archives, and subscription info: http://www.groupstudy.com >Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > > Tom Pruneau Trainer Network Operations GENUITY 3 Van de Graff Drive Burlington Ma. 01803 24 Hr. Network Operations Center 800-436-8489 If you need to get a hold of me my hours are 7AM-3PM ET Mon-Fri --- This email is composed of 82% post consumer recycled data bits --- "Once in a while you get shown the light in the strangest of places if you look at it right" **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: BECN s on Frame-Relay
Patrick, You might need more bandwidth, but it is not quite that simple. When you receive a BECN (Backward Explicit Congestion Notification) your Frame Relay network is telling you that it has encountered congestion in the network and has dropped traffic. It might be useful to find out where the FECN (Foreward Explicit Congestion Notification) ended up, as more bandwidth on this link could cause this condition to abate. Other potential solutions is to limit usage using ACLs or by adopting a more robust queuing strategy. Keep in mind that Frame Relay is a best-effort technology, and the BECNs you are receiving are a notification that the best-effort was not good enough. Also, keep in mind that limited numbers of FECNs and BECNs are to be expected, so don't lose sleep over them. If you really get hammered with them and have a negative end user experience associated with them, then you have a problem you can look at solving. Otherwise, you might be better served working out other issues in your network. HTH, Casey >From: Patrick Stiever <[EMAIL PROTECTED]> >Reply-To: Patrick Stiever <[EMAIL PROTECTED]> >To: "'[EMAIL PROTECTED]'" <[EMAIL PROTECTED]> >Subject: BECN s on Frame-Relay >Date: Mon, 25 Sep 2000 09:26:47 -0700 >MIME-Version: 1.0 >Received: from [208.32.175.78] by hotmail.com (3.2) with ESMTP id >MHotMailBB98D170002CD82197C9D020AF4E0CF921; Mon Sep 25 10:09:55 2000 >Received: from localhost (mail@localhost)by groupstudy.com (8.9.3/8.9.3) >with SMTP id MAA17333;Mon, 25 Sep 2000 12:42:12 -0400 >Received: by groupstudy.com (bulk_mailer v1.12); Mon, 25 Sep 2000 12:30:49 >-0400 >Received: (from listserver@localhost)by groupstudy.com (8.9.3/8.9.3) id >MAA14688GroupStudy Mailer; Mon, 25 Sep 2000 12:30:48 -0400 >Received: from mail.24hourfit.com ([63.64.130.20])by groupstudy.com >(8.9.3/8.9.3) with ESMTP id MAA14650GroupStudy Mailer; Mon, 25 Sep 2000 >12:30:47 -0400 >Received: from 24hrsdexch2.24hourfit.com ([192.102.1.33]) by >mail.24hourfit.com (Post.Office MTA v3.5.3 release 223 ID# >30-58152U100L2S100V35) with ESMTP id com for ><[EMAIL PROTECTED]>; Mon, 25 Sep 2000 09:22:54 -0700 >Received: by 24hrsdexch2.24hourfit.com with Internet Mail Service >(5.5.2650.21)id ; Mon, 25 Sep 2000 09:26:49 -0700 >From [EMAIL PROTECTED] Mon Sep 25 10:12:30 2000 >Message-ID: ><[EMAIL PROTECTED]> >X-Mailer: Internet Mail Service (5.5.2650.21) >Sender: [EMAIL PROTECTED] > >Ladies and Gentlemen, > > I have question on BECN s on a Frame-Relay Link. What would I have >to configure on the Routers to eliminate them, would it be a matter of >setting up buffers? Any info would be helpful. Thanks. > > >Patrick Stiever >Communications Engineer >24 Hour Fitness >(760) 918 4459 >[EMAIL PROTECTED] > >**NOTE: New CCNA/CCDA List has been formed. For more information go to >http://www.groupstudy.com/list/Associates.html >_ >UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html >FAQ, list archives, and subscription info: http://www.groupstudy.com >Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com. **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: BECN s on Frame-Relay
You might want to try configuring adaptive traffic-shaping based on BECN to reduce your congestion Jason -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Tom Pruneau Sent: Tuesday, September 26, 2000 2:00 AM To: Patrick Stiever; '[EMAIL PROTECTED]' Subject: Re: BECN s on Frame-Relay BECNs are mesages from the network; sourced by the network switches which the telco has control over, they are used to inform end devices or frame-relay subscribers (like yourself) that they (the telco switch) have entered a congested state. If elevated traffic levels continue the switch will begin to relieve congestion by selectively discarding frames with the DE (discard eligible) bit set to one. In other words these messages (BECNs) are intended to make users aware of a possible degraded network state. Its a warning (from the Telco) saying if you're over utilizing your link, back off because we're gonna have to start dropping frames if this congestion doesn't subside. If you notice continual accrual of BECNs causing you grief (delays, latency etc) you might want to get the telco to reconfigure your path (PVC) through their network. At 09:26 AM 09/25/2000 -0700, Patrick Stiever wrote: >Ladies and Gentlemen, > > I have question on BECN s on a Frame-Relay Link. What would I have >to configure on the Routers to eliminate them, would it be a matter of >setting up buffers? Any info would be helpful. Thanks. > > >Patrick Stiever >Communications Engineer >24 Hour Fitness >(760) 918 4459 >[EMAIL PROTECTED] > >**NOTE: New CCNA/CCDA List has been formed. For more information go to >http://www.groupstudy.com/list/Associates.html >_ >UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html >FAQ, list archives, and subscription info: http://www.groupstudy.com >Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > > Tom Pruneau Trainer Network Operations GENUITY 3 Van de Graff Drive Burlington Ma. 01803 24 Hr. Network Operations Center 800-436-8489 If you need to get a hold of me my hours are 7AM-3PM ET Mon-Fri --- This email is composed of 82% post consumer recycled data bits --- "Once in a while you get shown the light in the strangest of places if you look at it right" **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: BECN s on Frame-Relay
What do you mean "eliminate them"?? If you are receiving BECNs from your network that means that PVC is experiencing congestion. It's not a router problem, it's a traffic problem. If your traffic pattern is bursty then implement traffic shaping. If your traffic pattern is sustained, such as constant file transfers, then get more CIR or consider a point-to-point circuit instead of frame relay. Mike Balistreri Patrick Stiever wrote in message ... >Ladies and Gentlemen, > > I have question on BECN s on a Frame-Relay Link. What would I have >to configure on the Routers to eliminate them, would it be a matter of >setting up buffers? Any info would be helpful. Thanks. > > >Patrick Stiever >Communications Engineer >24 Hour Fitness >(760) 918 4459 >[EMAIL PROTECTED] > >**NOTE: New CCNA/CCDA List has been formed. For more information go to >http://www.groupstudy.com/list/Associates.html >_ >UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html >FAQ, list archives, and subscription info: http://www.groupstudy.com >Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
