Loopback Error Detected On
Contents |
Help Follow Us Facebook Twitter Google + LinkedIn Newsletter Instagram YouTube DirectoryNetwork InfrastructureWAN, Routing and Switching LAN, Switching and Routing Network Management Remote Access Optical Networking Getting Started with LANs IPv6 Integration
%ethcntr-3-loop_back_detected: Loop-back Detected
and Transition EEM Scripting Other Subjects SecurityVPN Security Management Firewalling Intrusion cscea46385 Prevention Systems/IDS AAA, Identity and NAC Physical Security MARS Email Security Web Security Other Subjects Service ProvidersMetro MPLS pm-4-err_disable channel-misconfig (stp) error detected Voice Over IP XR OS and Platforms Video Other Subjects Collaboration, Voice and VideoIP Telephony Video Over IP Jabber Clients Unified Communications Applications TelePresence Digital Media System Contact
Ethcntr-3-loop_back_detected Loop-back Detected On Gigabitethernet
Center Conferencing UC Migrations Other Subjects Wireless - MobilitySecurity and Network Management Wireless IP Voice and Video Getting Started with Wireless WLCCA Other Subjects ServicesCisco ServiceGrid Connected Analytics Smart Call Home Smart Net Total Care Operations Exchange Mobile ApplicationsCisco Proximity Cisco Technical Support Online Tools and ResourcesCisco Bug Discussions Technical Documentation Ideas Cisco CLI Analyzer Support Community Help
Disable Keepalives
Data CenterApplication Centric Infrastructure Application Networking Intelligent Automation Server Networking Storage Networking Unified Computing Wide Area Application Services (WAAS) Other Subjects Small BusinessNetwork Storage Routers Security Surveillance Switches Voice and Conferencing Wireless Solutions and ArchitecturesBorderless Networks Collaboration Cisco User GroupsSeattle Cisco User Group (SEACUG) Silicon Valley Cisco User Group (SVCUG) Southern California Cisco User Group (SCCUG) Cisco Certifications Cisco.com Idea Center Cisco Cafe Expert CornerTop Contributors Leaderboards Cisco Live! Events Events Community CornerAwards & Recognition Behind the Scenes Feedback Forum Cisco Certifications Cisco Press Café Cisco On Demand Support & Downloads Community Resources Security Alerts Security Alerts News News Video Cisco Support YouTube Cisco YouTube Blogs Technical Documentation Cisco Products Products Services Services Solutions Solutions Global Support Numbers Cisco Support Community Directory Network Infrastructure WAN, Routing and Switching LAN, Switching and Routing Network Management Remote Access Optical Networking Getting Started with LANs IPv6 Integration and Transition EEM Scripting Other Subjects Security VPN Security Management Firewalling Intrusion Prevention Systems/IDS AAA, Identity and NAC Physical Security MARS Email Security Web Security Other Subjects Ser
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 →
Loopback Error Handling
Equipment Support → Hardware By Brand → Cisco → [HELP] Figuring out the reason behind err-disabled loopback. uniqs1579 Share pm-4-err_disable link-flap error detected « 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 (WS-C3650-48PD) https://supportforums.cisco.com/discussion/10905251/pm-4-errdisable-loopback-error-detected-gi02 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 Memberjoin:2000-08-25New http://www.dslreports.com/forum/r30125337-HELP-Figuring-out-the-reason-behind-err-disabled-loopback 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 following :- Conf
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 has shown in log %ETHCNTR-3-LOOP_BACK_DETECTED: Loop-back detected on http://blog.qsolved.com/2010/05/pm-4-errdisable-loopback-error-detected.html GigabitEthernet0/2.Can somebody help us resolve the issue?Do check for the faulty cable, once you connect with http://www.networking-forum.com/viewtopic.php?f=33&p=243513 a new cable then enable the ports on both the switches.A loopback 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 source interface, which usually occurs because there is a logical loop in the network that the error detected 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 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 loopback error detected 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 ) ► February ( 17 ) ► January ( 24 ) ► 2013 ( 61 ) ► December ( 8 ) ► November ( 11 ) ► October ( 8 ) ► September ( 4 ) ► August ( 2 ) ► June ( 3 ) ► May ( 7 ) `
Information The requested topic does not exist.