Duplex Error Detected On Interfaces

SteelHead Appliance > Discussions Please enter a title. You can not post a blank message. Please type your message and try again. 5 Replies Latest reply: Feb 13, 2012 7:40 AM by Chris Geary lan0_0 rx error count johno1066 Feb 13, 2012 5:38 AM G'day,i'm receiving an rx count error

Speed And Duplex Auto Negotiation

count that matches exactly, the number of counted frames, the steelhead is giving a duplex duplex mismatch symptoms alarm however there are no collisions. The switch (lanside)is auto negotiate,(100 full)andgig capable, the steelhead Lan0_0 & wan0_0are both hardcoded to 100 full duplex settings cisco in order to match the WAN interface which is 100Mb capable. I understand from other threads that with gigainterfaces it is preferable to have auto negotiate but that to do so would likely leave us with a

Duplex Mismatch Cisco

speed mismatch between lan and wan interfaces. Cheers 1155Views Tags: none (add) Re: lan0_0 rx error count Chris Geary Feb 13, 2012 6:19 AM (in response to johno1066) If the wan router is hard coded to 100/Full, then you are forced to use the same configuration on all three other interfaces. The reason for this is to handle the situation where the Steelhead goes in to hardware bypass, you need to cater for that time

Auto Negotiation Vs Full Duplex

when the cables are joined. It is also critical when using hard coding that the cable types are correct as auto-mdix is also disabled.The potential problem with hardcoding to the wan port speed is that (depending on your WAN bandwidth and SH model), you could find that 100mbps on the LAN side isn't high enough.Your choices here are:1. Accept that fact and be content that in a bypass scenario your network will not blackhole2. Choose to set the lan switch and lan0_0 ports to auto negotiate to gain the benefit of gigabit speeds but risk blackholing in a bypass scenario. Report Abuse Like Show 0 Likes (0) Re: lan0_0 rx error count johno1066 Feb 13, 2012 6:32 AM (in response to Chris Geary) Thanks Chris,Very interesting and highlights the importance of tests on deployment. May I ask if rx errors on the lan0_0 specific to duplex issues or there any other contributory factors or checks that I can perform? the reason I ask is that I would have expected to see collisions if there was a duplex mismatch but in this case there are none at all.Cheers Report Abuse Like Show 0 Likes (0) Re: lan0_0 rx error count Chris Geary Feb 13, 2012 7:20 AM (in response to johno1066) This depends on which device has been hardcoded and which has failed auto negotiati

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How To Fix Duplex Mismatch

Engineering Questions Tags Users Badges Unanswered Ask Question _ Network Engineering Stack Exchange is a question and answer site for network cisco duplex command engineers. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top discover duplex mismatch https://splash.riverbed.com/thread/3284 interfaces in the network up vote 6 down vote favorite What are the causes of duplex mismatch other than misconfiguration? (power outage? improper cabling? auto negotiation implementation bugs?) Any thoughts on discovering duplex mismatch? NetMRI seems to use interface error rate. Is it sufficient to just poll all interface error rates on switches/servers? What if this feature is not available on a device? Edit: Drivers can definitely cause problems with duplex. http://networkengineering.stackexchange.com/questions/2420/discover-duplex-mismatch-interfaces-in-the-network I have seen Broadcom NIC stuck in half-duplex on FreeBSD. duplex share|improve this question edited Jul 19 '13 at 10:23 asked Jul 19 '13 at 5:26 sdaffa23fdsf 643721 what vendor's equipment are you thinking about? It matters for how it's discovered –Mike Pennington Jul 19 '13 at 9:17 really mixed.. Cisco Catalyst, H3C, HP Procurve, NetGear.. computers, printers, phones, IP cameras etc. –sdaffa23fdsf Jul 19 '13 at 10:21 add a comment| 4 Answers 4 active oldest votes up vote 14 down vote By far the most common issue would be misconfiguration. Some people still hold on to old beliefs that auto negotation does not work reliably. If you have different vendors there can be issues but I don't see it very often. I would much rather rely on auto negotiation as my first solution and if that fails fall back to hard coding it. It is quite common to see ports operating in 100/half because if one side has auto and other side has 100/full then the speed can be detected but the duplex must be assumed to be half because it can't be negotiated. Your NMS should be able to detect this but you could do a script that logins and does: sh int status | i ha

be challenged and removed. (February 2011) (Learn how and when to remove this template message) On an Ethernet connection, a duplex mismatch https://en.wikipedia.org/wiki/Duplex_mismatch is a condition where two connected devices operate in different duplex modes, that is, one operates in half duplex while the other one operates in full duplex. The effect of a duplex mismatch is a link that operates inefficiently. Duplex mismatch may be caused by manually setting two connected network interfaces at different duplex duplex mismatch modes or by connecting a device that performs autonegotiation to one that is manually set to a full duplex mode.[1] Contents 1 Duplex mismatch due to autonegotiation 2 Effects of duplex mismatch 3 References 4 External links Duplex mismatch due to autonegotiation[edit] When a device set to autonegotiation is connected to a device speed and duplex that is not using autonegotiation, the autonegotiation process fails. The autonegotiating end of the connection is still able to correctly detect the speed of the other end, but cannot correctly detect the duplex mode. For backwards compatibility with Ethernet hubs, the standard requires the autonegotiating device to use half duplex in these conditions. Therefore, the autonegotiating end of the connection uses half duplex while the non-negotiating peer is locked at full duplex, and this is a duplex mismatch. The Ethernet standards and major Ethernet equipment manufacturers recommend enabling autonegotiation.[2][3][4] Nevertheless, network equipment allows autonegotiation to be disabled and on some networks, autonegotiation is disabled on all ports and a fixed modality of 100 Mbit/s and full duplex is used. That was often done by network administrators intentionally upon the introduction of autonegotiation, because of interoperability issues with the initial autonegotiation specification. The fixed mode of operation works well if both ends of a connection are locked to the sam