Loopback Error Detected On Putting On Err-disable State
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Pm-4-err_disable Link-flap Error Detected
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Pm-4-err_disable Channel-misconfig (stp) Error Detected
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Disable Keepalives In Cisco Switch
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to find this is in the output of show interfaces status. A switch port can end be error pm-4-err_disable psecure-violation error detected disabled if the software (IOS or CatOS) detects an error
%ethcntr-3-half_dux_collision_exceed_threshold
situation on the port. The port is effectively shut down until re-enabled manually or automatically if a cscea46385 recovery timer is specified for the error condition. One such error condition results from the existence of a loopback on the port. The switch sends keepalive packets https://supportforums.cisco.com/discussion/10905251/pm-4-errdisable-loopback-error-detected-gi02 out all interfaces. If a keepalive packet is received on the same interface it was sent from, then a loop exists that has not been blocked by Spanning-Tree Protocol. If this occurs, these messages are generated (these specific messages are from a Cisco Catalyst 2940). %ETHCNTR-3-LOOP_BACK_DETECTED: Keepalive packet loop-back detected on FastEthernet0/3.
%PM-4-ERR_DISABLE: loopback https://slaptijack.com/networking/err-disabled-loopback-edition/ error detected on Fa0/3, putting Fa0/3 in err-disable state
To resolve the problem, you must investigate the network beyond the port that is complaining and discover what sort of logical loop might exist that was undetectable by STP. Often, less capable devices (inexpensive unmanaged switches or hubs) are the culprit. Related Reading: Cisco Field Manual: Catalyst Switch Configuration by David Hucaby, Stephen McQuerry Building Cisco Multilayer Switched Networks by Richard Froom, Balaji Sivasubramanian, Erum Frahim Related Posts UDLD In Radio-Based Metro Ethernet Rings Cisco Catalyst 3560 POST Output Allowing DHCP Option 82 in Cisco DHCP Relay Agents Brand New ME3400G Can't Ping! 3 Reasons You Should Be Using Rapid Spanning Tree (802.1w) Get Slaptijack updates delivered to your Inbox or RSS Reader for free! CATEGORIES Graphics Design Information Systems IT Management Networking Programming Software System Administration Uncategorized Voice / Voice over IP ARCHIVES 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 © 2016 Slaptijack All Rights Reserved · Wordpress
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2008 Loopback detected, port went error-disabled suddenly Email ThisBlogThis!Share to TwitterShare to FacebookShare to Pinterest One working switch port on my Cisco Catalyst 2950 suddenly went down by itself! Of course, my phone rang when I was having dinner, and then I had to tell my colleagues how to do a port reset step by step. Luckily, after the port reset, the port went back on. I did not pay much attention to this event, until it happened to the same port again! This time, I drilled in to check the log, and found something suspicious: .Jan 30 10:12:25: %ETHCNTR-3-HALF_DUX_COLLISION_EXCEED_THRESHOLD: Half-duplex loopback detected, collision threshold exceeded on FastEthernet0/24. .Jan 30 10:12:25: %PM-4-ERR_DISABLE: loopback error detected on Fa0/24, putting Fa0/24 in err-disable state .Jan 30 10:12:26: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/24, changed state to down .Jan 30 10:12:27: %LINK-3-UPDOWN: Interface FastEthernet0/24, changed state to down After my survey on Cisco.com, I found a workaround to this: just disable keepalive on that interface: Switch # config t Switch (config)# int f0/24 Switch (config-if)# no keepalive I believe that it is a software caveat. The phrase mentioned on the web page is: ..... The suggested workaround is to disable keepalives and upgrade to Cisco IOS Software Release 12.2SE or later. ..... References: Errdisable Port State Recovery on the Cisco IOS Platforms Do you like this post? You really should consider Subscribing by Email! Email ThisBlogThis!Share to TwitterShare to FacebookShare to Pinterest Tweet Posted by Li-Ji Hong at 5:24 PM Reactions: Location: Wanhua District, Taipei City, Taiwan No comments: Post a Comment Tip: you can also anonymously comment here. Newer Post Older Post Home Subscribe to: Post Comments (Atom) Popular Posts BGP sample practice, in the new Packet Tracer 5.3 I created this practice to test the Packet Tracer 5.3 features of BGP. Dual Stack IPv6 and IPv4 configuration (CNA-04-006) CCNA Exploration 4.0, Semester 4, "Dual Stack IPv6 and IPv4 configuration " Packet Tracer 5.0 practice file (CNA-04-006). ... Loopback detected, port went error-disabled suddenly One working switch port on my Cisco Catalyst 2950 suddenly went down by itself! Of course, my phone rang when I was having dinner, and the... How t