RE: ethernet errors explained [7:33687]
You can also get these nice kind of hard-to-troubleshoot issues if your cables are not wired properly; i.e. 'crossed or mismatched pairs' on some cable-testers. Specifically - if the pinout is such that the wrong wires are being twisted around each other ... would normally work just fine for really short runs, but get into 20' or longer and you get the problems listed below. Also - just for the record - we had absolute fits with our RS6k's as well until hard-coding each side at the same speed and duplex; 100/FULL. In our case . Thanks! TJ Steven A. Ridder wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Are you sure switch and NIC are the same speed and duplex? Looks like port speed/duplex mismatch. Patrick Donlon wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hi Everyone I trying to find some information on some Ethernet errors that I see on a port, see the text below. The machine is an RS6000 and was experiencing some performance problems, the NIC was set to auto negotiation and there were the usual errors. The port and NIC are now both fixed and the errors are increasing steadily, I've had a good search on the CCO but I can't find any explanation of what causes the errors, any advice will be appreciated Regards Patrick * The information in this email is confidential and may be legally privileged. It is intended solely for the addressee. Access to this email by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution or any action taken or omitted to be taken in reliance on it, is prohibited and may be unlawful. When addressed to our clients any opinions or advice contained in this email are subject to the terms and conditions expressed in the governing KPMG client engagement letter. * Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=33881t=33687 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: ethernet errors explained [7:33687]
I would change out the cat 5 cable and also move the cable to a different port/card on the switch. If you are still experiencing problems then I would replace the NIC on the server. Just my 2 cents. -Original Message- From: Evans, TJ [mailto:[EMAIL PROTECTED]] Sent: Thursday, January 31, 2002 11:12 AM To: [EMAIL PROTECTED] Subject: RE: ethernet errors explained [7:33687] You can also get these nice kind of hard-to-troubleshoot issues if your cables are not wired properly; i.e. 'crossed or mismatched pairs' on some cable-testers. Specifically - if the pinout is such that the wrong wires are being twisted around each other ... would normally work just fine for really short runs, but get into 20' or longer and you get the problems listed below. Also - just for the record - we had absolute fits with our RS6k's as well until hard-coding each side at the same speed and duplex; 100/FULL. In our case . Thanks! TJ Steven A. Ridder wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Are you sure switch and NIC are the same speed and duplex? Looks like port speed/duplex mismatch. Patrick Donlon wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hi Everyone I trying to find some information on some Ethernet errors that I see on a port, see the text below. The machine is an RS6000 and was experiencing some performance problems, the NIC was set to auto negotiation and there were the usual errors. The port and NIC are now both fixed and the errors are increasing steadily, I've had a good search on the CCO but I can't find any explanation of what causes the errors, any advice will be appreciated Regards Patrick * The information in this email is confidential and may be legally privileged. It is intended solely for the addressee. Access to this email by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution or any action taken or omitted to be taken in reliance on it, is prohibited and may be unlawful. When addressed to our clients any opinions or advice contained in this email are subject to the terms and conditions expressed in the governing KPMG client engagement letter. * Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=33885t=33687 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: ethernet errors explained [7:33687]
If it is feasible, you might want to move the workstation to work your switch is and connect with a CAT 5 patch cord. If you don't get the errors, then your problem is in the cabling between the switch and the workstation. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Bolton, Travis Sent: Thursday, January 31, 2002 10:36 AM To: [EMAIL PROTECTED] Subject: RE: ethernet errors explained [7:33687] I would change out the cat 5 cable and also move the cable to a different port/card on the switch. If you are still experiencing problems then I would replace the NIC on the server. Just my 2 cents. -Original Message- From: Evans, TJ [mailto:[EMAIL PROTECTED]] Sent: Thursday, January 31, 2002 11:12 AM To: [EMAIL PROTECTED] Subject: RE: ethernet errors explained [7:33687] You can also get these nice kind of hard-to-troubleshoot issues if your cables are not wired properly; i.e. 'crossed or mismatched pairs' on some cable-testers. Specifically - if the pinout is such that the wrong wires are being twisted around each other ... would normally work just fine for really short runs, but get into 20' or longer and you get the problems listed below. Also - just for the record - we had absolute fits with our RS6k's as well until hard-coding each side at the same speed and duplex; 100/FULL. In our case . Thanks! TJ Steven A. Ridder wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Are you sure switch and NIC are the same speed and duplex? Looks like port speed/duplex mismatch. Patrick Donlon wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hi Everyone I trying to find some information on some Ethernet errors that I see on a port, see the text below. The machine is an RS6000 and was experiencing some performance problems, the NIC was set to auto negotiation and there were the usual errors. The port and NIC are now both fixed and the errors are increasing steadily, I've had a good search on the CCO but I can't find any explanation of what causes the errors, any advice will be appreciated Regards Patrick * The information in this email is confidential and may be legally privileged. It is intended solely for the addressee. Access to this email by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution or any action taken or omitted to be taken in reliance on it, is prohibited and may be unlawful. When addressed to our clients any opinions or advice contained in this email are subject to the terms and conditions expressed in the governing KPMG client engagement letter. * Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=33904t=33687 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: ethernet errors explained [7:33687]
Are you sure switch and NIC are the same speed and duplex? Looks like port speed/duplex mismatch. Patrick Donlon wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hi Everyone I trying to find some information on some Ethernet errors that I see on a port, see the text below. The machine is an RS6000 and was experiencing some performance problems, the NIC was set to auto negotiation and there were the usual errors. The port and NIC are now both fixed and the errors are increasing steadily, I've had a good search on the CCO but I can't find any explanation of what causes the errors, any advice will be appreciated Regards Patrick Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=33691t=33687 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: ethernet errors explained [7:33687]
Positive, if you look at the show port (on the other mail) you'll see there are no collisions Thanks Steven A. Ridder wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Are you sure switch and NIC are the same speed and duplex? Looks like port speed/duplex mismatch. Patrick Donlon wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hi Everyone I trying to find some information on some Ethernet errors that I see on a port, see the text below. The machine is an RS6000 and was experiencing some performance problems, the NIC was set to auto negotiation and there were the usual errors. The port and NIC are now both fixed and the errors are increasing steadily, I've had a good search on the CCO but I can't find any explanation of what causes the errors, any advice will be appreciated Regards Patrick Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=33692t=33687 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: ethernet errors explained [7:33687]
Then try switching ports, shutting it down, different PC, etc,. It's probably the PC then Patrick Donlon wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Positive, if you look at the show port (on the other mail) you'll see there are no collisions Thanks Steven A. Ridder wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Are you sure switch and NIC are the same speed and duplex? Looks like port speed/duplex mismatch. Patrick Donlon wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hi Everyone I trying to find some information on some Ethernet errors that I see on a port, see the text below. The machine is an RS6000 and was experiencing some performance problems, the NIC was set to auto negotiation and there were the usual errors. The port and NIC are now both fixed and the errors are increasing steadily, I've had a good search on the CCO but I can't find any explanation of what causes the errors, any advice will be appreciated Regards Patrick Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=33695t=33687 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: ethernet errors explained [7:33687]
Just checking, did you try some of the basic ts steps? - Connect a different cable between them. - Try a different NIC - Try a different port - etc... Ole ~~~ Ole Drews Jensen Systems Network Manager CCNP, MCSE, MCP+I RWR Enterprises, Inc. [EMAIL PROTECTED] ~~~ http://www.RouterChief.com ~~~ NEED A JOB ??? http://www.oledrews.com/job ~~~ -Original Message- From: Patrick Donlon [mailto:[EMAIL PROTECTED]] Sent: Wednesday, January 30, 2002 8:36 AM To: [EMAIL PROTECTED] Subject: Re: ethernet errors explained [7:33687] Positive, if you look at the show port (on the other mail) you'll see there are no collisions Thanks Steven A. Ridder wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Are you sure switch and NIC are the same speed and duplex? Looks like port speed/duplex mismatch. Patrick Donlon wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hi Everyone I trying to find some information on some Ethernet errors that I see on a port, see the text below. The machine is an RS6000 and was experiencing some performance problems, the NIC was set to auto negotiation and there were the usual errors. The port and NIC are now both fixed and the errors are increasing steadily, I've had a good search on the CCO but I can't find any explanation of what causes the errors, any advice will be appreciated Regards Patrick Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=33700t=33687 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: ethernet errors explained [7:33687]
It's a RS6000 not a PC, I think it's running AIX Steven A. Ridder wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Then try switching ports, shutting it down, different PC, etc,. It's probably the PC then Patrick Donlon wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Positive, if you look at the show port (on the other mail) you'll see there are no collisions Thanks Steven A. Ridder wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Are you sure switch and NIC are the same speed and duplex? Looks like port speed/duplex mismatch. Patrick Donlon wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hi Everyone I trying to find some information on some Ethernet errors that I see on a port, see the text below. The machine is an RS6000 and was experiencing some performance problems, the NIC was set to auto negotiation and there were the usual errors. The port and NIC are now both fixed and the errors are increasing steadily, I've had a good search on the CCO but I can't find any explanation of what causes the errors, any advice will be appreciated Regards Patrick Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=33701t=33687 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: ethernet errors explained [7:33687]
You appear to have the inline power module for ip phones. I had a problem once on a server where I disabled the power on the port and this resolved the errors. C6509 (enable) set port inlinepower 2/26 off Dave Patrick Donlon wrote: And here's the show port I forgot!! (enable) sh port 2/26 Port Name Status Vlan Duplex Speed Type - -- -- -- -- - 2/26 Temp Driver server connected 990 full 100 10/100BaseTX Port AuxiliaryVlan AuxVlan-Status InlinePowered PowerAllocated Admin Oper Detected mWatt mA @42V - - -- - -- - 2/26 none none - - -- - Port Security Violation Shutdown-Time Age-Time Max-Addr Trap IfIndex - - - --- 2/26 disabled shutdown 001 disabled 51 Port Num-Addr Secure-Src-Addr Age-Left Last-Src-Addr Shutdown/Time-Left - - - -- 2/26 -- -- - Port Broadcast-Limit Broadcast-Drop --- 2/26 -0 Port Send FlowControlReceive FlowControl RxPause TxPause Unsupported adminoper adminoper opcodes - --- --- --- 2/26 off offoff off 0 0 0 Port Status Channel Admin Ch Mode Group Id - -- - - 2/26 connected auto silent 68 0 Port Align-Err FCS-ErrXmit-Err Rcv-ErrUnderSize - -- -- -- -- - 2/26 154661 138931 0 0 6246 Port Single-Col Multi-Coll Late-Coll Excess-Col Carri-Sen Runts Giants - -- -- -- -- - - -- --- 2/26 0 0 0 0 0 30531 1 Port Last-Time-Cleared - -- Patrick Donlon wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hi Everyone I trying to find some information on some Ethernet errors that I see on a port, see the text below. The machine is an RS6000 and was experiencing some performance problems, the NIC was set to auto negotiation and there were the usual errors. The port and NIC are now both fixed and the errors are increasing steadily, I've had a good search on the CCO but I can't find any explanation of what causes the errors, any advice will be appreciated Regards Patrick -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=33702t=33687 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: ethernet errors explained [7:33687]
Dave tried that one first as I thought it was the most interesting, but sadly (enable) set port inline 2/26 off Feature not supported on module 2. I'll go back to basics first Ole. Thanks for the replies Pat MADMAN wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... You appear to have the inline power module for ip phones. I had a problem once on a server where I disabled the power on the port and this resolved the errors. C6509 (enable) set port inlinepower 2/26 off Dave Patrick Donlon wrote: And here's the show port I forgot!! (enable) sh port 2/26 Port Name Status Vlan Duplex Speed Type - -- -- -- -- - 2/26 Temp Driver server connected 990 full 100 10/100BaseTX Port AuxiliaryVlan AuxVlan-Status InlinePowered PowerAllocated Admin Oper Detected mWatt mA @42V - - -- - -- - 2/26 none none - - -- - Port Security Violation Shutdown-Time Age-Time Max-Addr Trap IfIndex - - - --- 2/26 disabled shutdown 001 disabled 51 Port Num-Addr Secure-Src-Addr Age-Left Last-Src-Addr Shutdown/Time-Left - - - -- 2/26 -- -- - Port Broadcast-Limit Broadcast-Drop --- 2/26 -0 Port Send FlowControlReceive FlowControl RxPause TxPause Unsupported adminoper adminoper opcodes - --- --- --- 2/26 off offoff off 0 0 0 Port Status Channel Admin Ch Mode Group Id - -- - - 2/26 connected auto silent 68 0 Port Align-Err FCS-ErrXmit-Err Rcv-ErrUnderSize - -- -- -- -- - 2/26 154661 138931 0 0 6246 Port Single-Col Multi-Coll Late-Coll Excess-Col Carri-Sen Runts Giants - -- -- -- -- - - -- --- 2/26 0 0 0 0 0 30531 1 Port Last-Time-Cleared - -- Patrick Donlon wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hi Everyone I trying to find some information on some Ethernet errors that I see on a port, see the text below. The machine is an RS6000 and was experiencing some performance problems, the NIC was set to auto negotiation and there were the usual errors. The port and NIC are now both fixed and the errors are increasing steadily, I've had a good search on the CCO but I can't find any explanation of what causes the errors, any advice will be appreciated Regards Patrick -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=33707t=33687 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: ethernet errors explained [7:33687]
Patrick Donlon wrote: Positive, if you look at the show port (on the other mail) you'll see there are no collisions As the port is in full duplex, the fact that it doesn't show any collisions doesn't mean anything, as it doesn't look for them. I agree with the previous poster: triple-check the NIC in the RS6000. Lots of runts, CRC errors and alignment errors on a FDX port is an almost-sure sign that the other end is set to half duplex. Regards, Marco. Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=33735t=33687 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: ethernet errors explained [7:33687]
At 09:35 AM 1/30/02, Patrick Donlon wrote: Positive, if you look at the show port (on the other mail) you'll see there are no collisions This side is set (or auto-negotiated) to full duplex. Receiving while sending is not an error. This side should never report a collision. That doesn't mean that there can't be a duplex-mode mismatch. A mismatch could result in both sides reporting errors, just of different sorts. The other side could be set (or auto-negotiated) to half-duplex. You should check if it has errors, including collisions. If the half-duplex side does its normal CSMA/CD thing, senses no data, and happens to send while the other side is sending, the result is a collision from the half-duplex sender's viewpoint. The half-duplex side stops sending and backs off, in the middle of its frame. The result is probably a runt with either an alignment and/or Frame Check Sequence (FCS) error. The recipient receives an errored frame, even though it can't correlate this with a collision event. The recipient reports a runt and/or FCS or alignment error. Now, if you are sure that you don't have the obvious problem that everyone is going to assume you have (duplex mismatch), and you are still seeing alignment and FCS errors, then it's time to start investigating what else besides collisions could damage frames. An FCS means that the FCS placed in the frame by the sender doesn't match the FCS calculated by the recipient. In other words, a bit got changed. An alignment error means that the frame didn't end on an 8-bit boundary. In other words, a bit got dropped. Besides collisions, these errors could be caused by crosstalk, impedance mismatch, noise, running a power generator next the cables, lightning strikes, etc. Hope that makes sense. Please let us know the resolution. It will be a good learning experience. Priscilla Thanks Steven A. Ridder wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Are you sure switch and NIC are the same speed and duplex? Looks like port speed/duplex mismatch. Patrick Donlon wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hi Everyone I trying to find some information on some Ethernet errors that I see on a port, see the text below. The machine is an RS6000 and was experiencing some performance problems, the NIC was set to auto negotiation and there were the usual errors. The port and NIC are now both fixed and the errors are increasing steadily, I've had a good search on the CCO but I can't find any explanation of what causes the errors, any advice will be appreciated Regards Patrick Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=33755t=33687 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: ethernet errors explained [7:33687]
I'm sure we'll keep seeing this problem for years to come... Auto negotiate does NOT work properly for a lot of NICs with older drivers. If you can, upgrade the driver on the RS6000. I know a while back IBM used the 3Com chipset in RS6000s, I don't know if that's true anymore but I bet it is. IBM may or may not have a driver that addresses this issue, in which case you are going to have to force the duplex on the RS6000 to full and do the same on the switch. - Original Message - From: Priscilla Oppenheimer To: Sent: Wednesday, January 30, 2002 3:38 PM Subject: Re: ethernet errors explained [7:33687] At 09:35 AM 1/30/02, Patrick Donlon wrote: Positive, if you look at the show port (on the other mail) you'll see there are no collisions This side is set (or auto-negotiated) to full duplex. Receiving while sending is not an error. This side should never report a collision. That doesn't mean that there can't be a duplex-mode mismatch. A mismatch could result in both sides reporting errors, just of different sorts. The other side could be set (or auto-negotiated) to half-duplex. You should check if it has errors, including collisions. If the half-duplex side does its normal CSMA/CD thing, senses no data, and happens to send while the other side is sending, the result is a collision from the half-duplex sender's viewpoint. The half-duplex side stops sending and backs off, in the middle of its frame. The result is probably a runt with either an alignment and/or Frame Check Sequence (FCS) error. The recipient receives an errored frame, even though it can't correlate this with a collision event. The recipient reports a runt and/or FCS or alignment error. Now, if you are sure that you don't have the obvious problem that everyone is going to assume you have (duplex mismatch), and you are still seeing alignment and FCS errors, then it's time to start investigating what else besides collisions could damage frames. An FCS means that the FCS placed in the frame by the sender doesn't match the FCS calculated by the recipient. In other words, a bit got changed. An alignment error means that the frame didn't end on an 8-bit boundary. In other words, a bit got dropped. Besides collisions, these errors could be caused by crosstalk, impedance mismatch, noise, running a power generator next the cables, lightning strikes, etc. Hope that makes sense. Please let us know the resolution. It will be a good learning experience. Priscilla Thanks Steven A. Ridder wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Are you sure switch and NIC are the same speed and duplex? Looks like port speed/duplex mismatch. Patrick Donlon wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hi Everyone I trying to find some information on some Ethernet errors that I see on a port, see the text below. The machine is an RS6000 and was experiencing some performance problems, the NIC was set to auto negotiation and there were the usual errors. The port and NIC are now both fixed and the errors are increasing steadily, I've had a good search on the CCO but I can't find any explanation of what causes the errors, any advice will be appreciated Regards Patrick Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=33764t=33687 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: ethernet errors explained [7:33687]
Patrick, in my previous post I mentioned the problem being related to duplex mismatch but I missed the part where you said that you had fixed both sides. Make sure that there is no CAT3 wiring in the cabling somewhere. Try setting the NIC and port to 10/half and then to 10/full to see if there are errors. (side note: you can run 10/full on CAT3 wiring without errors) If there are, I would replace the NIC as the next step. - Original Message - From: Priscilla Oppenheimer To: Sent: Wednesday, January 30, 2002 3:38 PM Subject: Re: ethernet errors explained [7:33687] At 09:35 AM 1/30/02, Patrick Donlon wrote: Positive, if you look at the show port (on the other mail) you'll see there are no collisions This side is set (or auto-negotiated) to full duplex. Receiving while sending is not an error. This side should never report a collision. That doesn't mean that there can't be a duplex-mode mismatch. A mismatch could result in both sides reporting errors, just of different sorts. The other side could be set (or auto-negotiated) to half-duplex. You should check if it has errors, including collisions. If the half-duplex side does its normal CSMA/CD thing, senses no data, and happens to send while the other side is sending, the result is a collision from the half-duplex sender's viewpoint. The half-duplex side stops sending and backs off, in the middle of its frame. The result is probably a runt with either an alignment and/or Frame Check Sequence (FCS) error. The recipient receives an errored frame, even though it can't correlate this with a collision event. The recipient reports a runt and/or FCS or alignment error. Now, if you are sure that you don't have the obvious problem that everyone is going to assume you have (duplex mismatch), and you are still seeing alignment and FCS errors, then it's time to start investigating what else besides collisions could damage frames. An FCS means that the FCS placed in the frame by the sender doesn't match the FCS calculated by the recipient. In other words, a bit got changed. An alignment error means that the frame didn't end on an 8-bit boundary. In other words, a bit got dropped. Besides collisions, these errors could be caused by crosstalk, impedance mismatch, noise, running a power generator next the cables, lightning strikes, etc. Hope that makes sense. Please let us know the resolution. It will be a good learning experience. Priscilla Thanks Steven A. Ridder wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Are you sure switch and NIC are the same speed and duplex? Looks like port speed/duplex mismatch. Patrick Donlon wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hi Everyone I trying to find some information on some Ethernet errors that I see on a port, see the text below. The machine is an RS6000 and was experiencing some performance problems, the NIC was set to auto negotiation and there were the usual errors. The port and NIC are now both fixed and the errors are increasing steadily, I've had a good search on the CCO but I can't find any explanation of what causes the errors, any advice will be appreciated Regards Patrick Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=33771t=33687 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: ethernet errors explained [7:33687]
Are your systems connected by any type of punch down blocks. I have experience may of these errors due to crosstalk (like Priscilla stated) caused by bad punch down blocks. The only way i was able to see the sources causing the problems was with a lan fluke. Ko Priscilla Oppenheimer wrote: At 09:35 AM 1/30/02, Patrick Donlon wrote: Positive, if you look at the show port (on the other mail) you'll see there are no collisions This side is set (or auto-negotiated) to full duplex. Receiving while sending is not an error. This side should never report a collision. That doesn't mean that there can't be a duplex-mode mismatch. A mismatch could result in both sides reporting errors, just of different sorts. The other side could be set (or auto-negotiated) to half-duplex. You should check if it has errors, including collisions. If the half-duplex side does its normal CSMA/CD thing, senses no data, and happens to send while the other side is sending, the result is a collision from the half-duplex sender's viewpoint. The half-duplex side stops sending and backs off, in the middle of its frame. The result is probably a runt with either an alignment and/or Frame Check Sequence (FCS) error. The recipient receives an errored frame, even though it can't correlate this with a collision event. The recipient reports a runt and/or FCS or alignment error. Now, if you are sure that you don't have the obvious problem that everyone is going to assume you have (duplex mismatch), and you are still seeing alignment and FCS errors, then it's time to start investigating what else besides collisions could damage frames. An FCS means that the FCS placed in the frame by the sender doesn't match the FCS calculated by the recipient. In other words, a bit got changed. An alignment error means that the frame didn't end on an 8-bit boundary. In other words, a bit got dropped. Besides collisions, these errors could be caused by crosstalk, impedance mismatch, noise, running a power generator next the cables, lightning strikes, etc. Hope that makes sense. Please let us know the resolution. It will be a good learning experience. Priscilla Thanks Steven A. Ridder wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Are you sure switch and NIC are the same speed and duplex? Looks like port speed/duplex mismatch. Patrick Donlon wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hi Everyone I trying to find some information on some Ethernet errors that I see on a port, see the text below. The machine is an RS6000 and was experiencing some performance problems, the NIC was set to auto negotiation and there were the usual errors. The port and NIC are now both fixed and the errors are increasing steadily, I've had a good search on the CCO but I can't find any explanation of what causes the errors, any advice will be appreciated Regards Patrick Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=33830t=33687 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: ethernet errors explained [7:33687]
I think the NIC is bad - have you tried changing to another port on the switch and see if the errors move with it -Original Message- From: Patrick Donlon [mailto:[EMAIL PROTECTED]] Sent: 30 January 2002 16:36 PM To: [EMAIL PROTECTED] Subject: Re: ethernet errors explained [7:33687] Positive, if you look at the show port (on the other mail) you'll see there are no collisions Thanks Steven A. Ridder wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Are you sure switch and NIC are the same speed and duplex? Looks like port speed/duplex mismatch. Patrick Donlon wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hi Everyone I trying to find some information on some Ethernet errors that I see on a port, see the text below. The machine is an RS6000 and was experiencing some performance problems, the NIC was set to auto negotiation and there were the usual errors. The port and NIC are now both fixed and the errors are increasing steadily, I've had a good search on the CCO but I can't find any explanation of what causes the errors, any advice will be appreciated Regards Patrick Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=33836t=33687 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
