Pm-4-err_disable Loopback Error Detected On Gi0/1
Contents |
SwitchingSpanning Tree ProtocolTroubleshoot and AlertsConfiguration Example and TechNotes Errdisable Port State Recovery on the Cisco IOS Platforms Download Print Available Languages Download Options PDF pm-4-err_disable link-flap error detected (143.8 KB) View with Adobe Reader on a variety of devices ePub
Err Disabled Reason Loopback
(82.1 KB) View in various apps on iPhone, iPad, Android, Sony Reader, or Windows Phone Mobi (Kindle) (87.6 KB)
Pm-4-err_disable Bpduguard Error Detected
View on Kindle device or Kindle app on multiple devices Updated:Mar 23, 2016 Document ID:69980 ContentsIntroductionPrerequisitesRequirementsComponents UsedBackground InformationPlatforms That Use ErrdisableErrdisableFunction of ErrdisableCauses of ErrdisableDetermine If Ports Are in the
%ethcntr-3-loop_back_detected: Loop-back Detected
Errdisabled StateDetermine the Reason for the Errdisabled State (Console Messages, Syslog, and the show errdisable recovery Command)Recover a Port from Errdisabled StateCorrect the Root ProblemReenable the Errdisabled PortsVerifyTroubleshootRelated Information Introduction This document defines the errdisabled state, describes how to recover from it, and provides examples of errdisable recovery. This document uses the terms errdisable and error disable interchangeably. Customers often contact pm-4-err_disable channel-misconfig (stp) error detected Cisco Technical Support when they notice that one or more of their switch ports have become error disabled, which means that the ports have a status of errdisabled. These customers want to know why the error disablement happened and how they can restore the ports to normal. Note: The port status of err-disabled displays in the output of the show interfaces interface_number status command. Prerequisites Requirements There are no specific requirements for this document. Components Used In order to create the examples in this document, you need two Cisco Catalyst 4500/6500 Series Switches (or the equivalent) in a lab environment with cleared configurations. The switches should run Cisco IOSĀ® Software and each switch should have two Fast Ethernet ports that are capable of EtherChannel and PortFast. The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command. Background Information Platforms That Use Errdisable The errdisable feature is sup
IP isWhoisCalculatorTool PointsNewsNews tip?ForumsAll ForumsHot TopicsGalleryInfoHardwareAll FAQsSite FAQDSL FAQCable TechAboutcontactabout uscommunityISP FAQAdd ISPISP Ind. ForumsJoin Search similar:Cisco SAP-1602i connected to 2960 trunk port[HELP] Transit VRF Question[Config] Performance due to VLAN, incomplete STP, or loop backs?[Config] Cisco Switches Trying to Carry a VLAN's trafficCisco %ethcntr-3-half_dux_collision_exceed_threshold 887VA-M-K9 can't ping local LAN or the other way around Forums → disable keepalives in cisco switch Equipment Support → Hardware By Brand → Cisco → [HELP] Figuring out the reason behind err-disabled loopback. uniqs1619 Share cscea46385 « VLAN question • A little update on daily fun » techsup1983join:2013-03-23 techsup1983 Member 2015-Jun-20 4:47 am [HELP] Figuring out the reason behind err-disabled loopback.Hello all.We have a core switch http://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/69980-errdisable-recovery.html (WS-C3650-48PD) and there are ports which keep showingPort Name Status Reason Err-disabled VlanGi2/0/19 err-disabled loopbackis it a good idea to do the no keepalives command on the ports or would there be a way to get more information.What would be the best way to troubleshoot this?Please ask me for anything i've not mentioned. Thanks. · actions · 2015-Jun-20 4:47 am · tired_runnerPremium http://www.dslreports.com/forum/r30125337-HELP-Figuring-out-the-reason-behind-err-disabled-loopback Memberjoin:2000-08-25New York tired_runner Premium Member 2015-Jun-20 9:49 am Please draw up a quick and dirty MS Paint diagram of your topology, particularly where your 3650 connects to other switches. · actions · 2015-Jun-20 9:49 am · markysharkeyPremium Memberjoin:2012-12-20united kingd markysharkey to techsup1983 Premium Member 2015-Jun-21 11:52 am to techsup1983err-disable loopback could be because storm control is enabled on the port and it keeps seeing BPDU's and/or traffic from a loop.As well as the diagram Network Guy has asked for lets have see the output for the following:show run int gi 2/0/19 sho int gig 2/0/19 sho int trunk shp spanning-tree vlan x (where x is the native VLAN) The only time I see a port with the spanning-tree port-state listed as loopback is where every switch in a topology has had spanning tree disabled except for one. I used to demo this in a lab environment when I taught CCNA and was showing switching loops and how to deal with them. · actions · 2015-Jun-21 11:52 am · HELLFIREMVMjoin:2009-11-25 HELLFIRE to techsup1983 MVM 2015-Jun-21 1:51 pm to techsup1983My immediate thoughts, we need the follo
2960 se Swtich on our LAN that is connected with another Cisco switch with trunk with crass cable. The backbone link is down frequtly since we have installed it on network follwing Eror http://blog.qsolved.com/2010/05/pm-4-errdisable-loopback-error-detected.html has shown in log %ETHCNTR-3-LOOP_BACK_DETECTED: Loop-back detected on GigabitEthernet0/2.Can somebody help us resolve the issue?Do check for the faulty cable, once you connect with a new cable then enable the ports on both the switches.A loopback http://www.networking-forum.com/viewtopic.php?f=33&p=243513 error occurs when the keepalive packet is looped back to the port that sent the keepalive. The switch sends keepalives out all the interfaces by default. A device can loop the packets back to the error detected source interface, which usually occurs because there is a logical loop in the network that the spanning tree has not blocked. The source interface receives the keepalive packet that it sent out, and the switch disables the interface (errdisable). This message occurs because the keepalive packet is looped back to the port that sent the keepalive:Keepalives are sent on all interfaces by default in Cisco IOS Software Release 12.1EA-based software. In pm-4-err_disable loopback error Cisco IOS Software Release 12.2SE-based software and later, keepalives are not sent by default on fiber and uplink interfaces. The suggested workaround is to disable keepalives and upgrade to Cisco IOS Software Release 12.2SE or later.Please click here for more details on Errisable Port State Recovery on the Cisco IOS Platforms.Citation - This blog post does not reflect original content from the author. Rather it summarizes content that are relevant to the topic from different sources in the web. The sources might include any online discussion boards, forums, websites and others. Posted by Info at 9:52 AM Email This BlogThis! Share to Twitter Share to Facebook Labels: %ETHCNTR-3-LOOP_BACK_DETECTED , Cisco 2960 No comments : Post a Comment Newer Post Older Post Home Subscribe to: Post Comments ( Atom ) What is Qsolved? QSolved is a online tech support marketplace that helps you ask, collaborate and resolve your tech support issues with certified Cisco experts around the world. No Contracts required First 3 question are free 100% refund if you are not satisfied. Visit us at www.qsolved.com Ask a Cisco expert Become a fan - Don't miss updates on Cisco's prodcuts Qsolved.com on Facebook Blog Archive ► 2014 ( 79 ) ► April ( 11 ) ► March ( 27 ) ► Febr
Information The requested topic does not exist.