Crc Error Threshold
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View View unanswered posts View active topics View new posts View your posts RIP, EIGRP, OSPF, IS-IS, BGP, MPLS, VTP, STP. Post a reply 19 posts Page 1 crc errors dsl modem of 1 Retired Account Post Whore Posts: 3512 Joined: Mon Nov 16, adsl crc errors causes 2009 8:10 pm Acceptable level of CRC errors Tue Jun 25, 2013 12:53 pm Hello,I'm in the process
How Many Crc Errors Are Normal
of researching this now, but does anyone what the threshold is for acceptable level of CRC errors in full-duplex communication? I've seen 1% and .001%. I'm looking into an issue
High Crc Errors
where looking at some interfaces, I divide the number of CRC errors by the number of input packets and some of them are coming out to as high as 15%. ristau5741 Post Whore Posts: 10618 Joined: Tue Aug 21, 2007 2:15 pm Certs: Instanity Re: Acceptable level of CRC errors Tue Jun 25, 2013 1:06 pm Steven King wrote:what the threshold crc errors adsl is for acceptable level of CRC errors in full-duplex communication? 0%, There should be no errors. Tips of the day:- The human mind is the ultimate creation invention.- I have so many customers, my customers have customers. - Sausage time- POP, stack, and store Retired Account Post Whore Posts: 3512 Joined: Mon Nov 16, 2009 8:10 pm Re: Acceptable level of CRC errors Tue Jun 25, 2013 1:14 pm Haha... in that case almost every interface on this particular switch has problems. mynd Ultimate Member Posts: 883 Joined: Fri Jul 23, 2010 9:43 am Certs: CCNA, A+, Net+, Sec+, Server+ Re: Acceptable level of CRC errors Tue Jun 25, 2013 1:20 pm From my experience, CRC errors usually are either a misconfig (static duplex vs auto duplex) or a physical issue (cabling or ports). I haven't seen CRC errors caused by anything else. Nonetheless, in general terms, from an article that was recommended here, iirc, the number of errors on an interface should be <.001% (I'll have to search for the article and post) http://justnetworked.wordpress.com Vito_Corleone Moderator Posts: 9850 Joined: Mon
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DIY Forum (Name TBD!) Operating Systems & Software Battlefront Microsoft what are crc errors OS & Software Colloquium Linux Kung Fu Windows Technical Mojo Distributed Computing Arcana snr margin Macintoshian Achaia Programmer's Symposium The Server Room Ars Lykaion Gaming, Extra Strength Caplets The Lounge The Soap Box The Boardroom The Observatory http://www.networking-forum.com/viewtopic.php?t=38451 Ars Help & Feedback Ars Subscription Member Areas Image Galleries Acceptable CRC errors on ADSL? 6 posts Quitch "Lord of the Fleas" Ars Praefectus Tribus: UK Registered: Apr 22, 2003Posts: 3154 Posted: Fri Jul 03, 2009 4:00 pm As my ADSL provider allows me to choose my SNR and whether or not to use interleaving I'm trying to http://arstechnica.com/civis/viewtopic.php?t=87084 find a good balance. However I want to see if there's some general rule of thumb which can be applied to percentage of CRC errors. Is there some particular point where the additional errors mean you're losing more from the additional errors than you gain from the better latency? Uhlek "I'll stab you in the face" Ars Tribunus Angusticlavius Tribus: Norfolk, VA Registered: Jan 21, 2003Posts: 6650 Posted: Fri Jul 03, 2009 4:27 pm As a general rule of thumb, an error free link should be a higher priority. Dropping packets will kill throughput a lot faster than any potential increase in link speed.That being said, though, the impact of dropped packets varies depending on the type of traffic you're pumping through. Certain kinds of traffic (gaming, voice, real time video, etc.) are a lot less forgiving of packet drops than normal web browsing, for example. Hat Monster "Armed and Hammered" Ars Legatus Legionis Tribus: Yorkshire (it's grim oop north) Registered: Jan 21, 2001Posts: 42627 Posted: Fri Jul 03, 2009 6:16 pm No, there isn
turn on suggestions Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Showing results for Search instead for Do you mean Home Discuss Products Application Delivery http://community.brocade.com/t5/SAN-Health-Utility/ISL-CRC-Errors-what-is-an-acceptable-threshold/td-p/11358 (ADX) vADC SteelApp Products Ethernet Fabric (VDX, CNA) Ethernet Switches & Routers https://www.mail-archive.com/cisco@groupstudy.com/msg93750.html Fibre Channel (SAN) Management Software Mobility/Wireless Virtual Router/ Firewall/ VPN Solutions Education K-12/Higher Ed Healthcare Mainframe & FICON Education & Certification Brocade University Certification Tools NET Health Utility SAN Health Utility Technology OpenScript SDN + NFV Developer Network Attend Events Blogs Technology vADC/SteelApp Campus Networks Data crc error Center Networks Storage Networks Mainframe Solutions Lateral Thinking Design & Build SDN + NFV Mobility Wireless Industry Service Providers Federal Insights Global Services Mission Support Services & Support Brocade University International EMEA Innovation Centre Brocade Deutschland Blog Brocade French Blog Brocade Japan Blog Brocade China Blog Office of the CTO CTO Corner Corporate Wingspan Under The Wing crc error threshold Global Connections Partners The Channel Documents Social MyBrocade SDN + NFV Brocade Community Forums : Discussion Forums : Tools : SAN Health Utility : ISL CRC Errors_ what is an acceptable threshold SAN Health Utility Reply Topic Options Subscribe to RSS Feed Mark Topic as New Mark Topic as Read Float this Topic to the Top Bookmark Subscribe Printer Friendly Page « Message Listing « Previous Topic Next Topic » in_the_corner Occasional Contributor Posts: 9 Registered: 02-10-2008 ISL CRC Errors_ what is an acceptable threshold Options Mark as New Bookmark Subscribe Subscribe to RSS Feed Highlight Print Email to a Friend Report Inappropriate Content 02-03-2009 05:24 PM One of the ISL cables we have laid seems to displaying CRC errors. We have since relaid it and the errors have reduced but not gone away. I've sent some data through this link and pasted the ports in question below (ouput is from porterrshow). frames enc crc too too bad enc disc link loss loss frjt fbsy tx rx in err shrt lon
assume that you are referring to CRC errors on full-duplex Ethernet or serial links. CRC errors are caused by noise, signal reflections, impedance mismatches, improperly installed demarcs, faulty hardware, and other bad things that really shouldn't happen. The number should be really low. That's helpful, eh? :-) CRC errors should be less on fiber-optic cabling compared to copper cabling. According to industry standards, fiber-optic cabling should not experience more than one bit error per 10^11 bits. Copper cabling should not experience more than one bit error per 10^6 bits. Some documents from Cisco and other vendors specify a threshold of one bad frame per megabyte of data. In other words, an interface should not experience more than one CRC error per megabyte of data received. (The "megabyte of data" threshold comes from the industry standards that state that copper cables should not have a bit error rate that exceeds 1 in 10^6.) This method is better than simply calculating a percentage of bad frames compared to good frames, which does not account for the variable size of frames. (If you have a constant flow of 64-byte frames, for example, and a percentage of them is getting damaged, that probably represents a more serious problem than the same percentage of 1500-byte frames getting damaged. So, it's better to use a total number of bytes rather than a total number of frames in the calculation.) When troubleshooting at the Data Link Layer, which deals with frames rather than bits, you can't actually determine a bit error rate, but you can at least get a rough estimate by considering the number of CRC errors compared to the number of megabytes received. Some Cisco documentation simply states that a problem exists if input errors are in excess of 1 percent of total interface traffic. This is easier to