Pagp-flap Error Detected On Port-channel
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Cisco Link Flap Detection
topics with top experts Blogs Read the latest tech blogs err-disabled loopback written by experienced community members >>VIEW ALL POSTS Network technologies and trends « How to change bpduguard errdisable nexus an IP address in a HP Procurve Switch What is Service timestamps logging, and how it can be configured Cisco Switch or a Router? » https://supportforums.cisco.com/discussion/10500186/error-pm-4-errdisable-pagp-flap-error-and-putting-fa08-error-dis Aug 17 2008 5:55AM GMT What is the Link-flap error in Cisco Switches? Yasir Irfan Profile: Yasir Irfan Link flap means that the interface continually goes up and down in a Cisco Switch. The interface is put into the errdisabled state if it flaps more than five times in 10 seconds. http://itknowledgeexchange.techtarget.com/network-technologies/what-is-the-link-flap-error-in-cisco-switches/ The common cause of link flap is a Layer 1 issue such as a bad cable, duplex mismatch, or bad Gigabit Interface Converter (GBIC) card. Look at the console messages or the messages that were sent to the syslog server that state the reason for the port shutdown. 13w0d: %PM-4-ERR_DISABLE: link-flap error detected on Fa0/28, putting Fa0/28 in err-disable state Issue this command in order to view the flap values: SRCL-ONC-3550-AS01# sho errdisable flap-values ErrDisable Reason Flaps Time (sec) ----------- ---- -------
pagp-flap 3 30 dtp-flap 3 30 link-flap 5 10 SRCL-ONC-3550-AS01# The interface can be recovered from errdisable state by reenabling the port using the errdisable recovery cause link-flap. This command is used to configure the recovery mechanism so that the interface can be brought out of the disabled state and allowed to try again. You can also set the time interval. Errdisable recovery is disabled by default in CiscoFORUMSFOR COMPUTER PROFESSIONALS Log In Come Join Us! Are you aComputer / IT professional?Join Tek-Tips Forums! Talk With http://www.tek-tips.com/viewthread.cfm?qid=1691944 Other Members Be Notified Of ResponsesTo Your Posts Keyword Search One-Click Access To YourFavorite Forums Automated SignaturesOn Your Posts Best Of All, It's Free! Join Us! http://www.techexams.net/forums/ccnp/55266-spanning-tree-putting-interfaces-err-disable.html *Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting Guidelines Promoting, selling, recruiting, coursework and thesis posting is error detected forbidden.Tek-Tips Posting Policies Jobs Jobs from Indeed What: Where: jobs by Link To This Forum! Add Stickiness To Your Site By Linking To This Professionally Managed Technical Forum.Just copy and paste the BBCode HTML Markdown MediaWiki reStructuredText code below into your site. Cisco: Switches Forum at Tek-Tips HomeForumsCommunications RackNetworkingCisco: Switches Forum link-flap pagp-flap error detected err-disabled thread558-1691944 Forum Search FAQs Links MVPs link-flap err-disabled link-flap err-disabled Carpua (ISP) (OP) 29 Aug 12 04:20 hi all i have a port that keeps going into err-disabled mode and shutdown. i configured err-disabled recovery on the switch but the port still doesn't get back up. below is a log results and err-disabled configuration Aug 29 07:09:20.628: %PM-4-ERR_DISABLE: link-flap error detected on Gi0/42, putting Gi0/42 in err-disable state Aug 29 07:09:45.517: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/35, changed state to down Aug 29 07:09:50.626: %PM-4-ERR_RECOVER: Attempting to recover from link-flap err-disable state on Gi0/42 Aug 29 07:10:19.835: %PM-4-ERR_DISABLE: link-flap error detected on Gi0/42, putting Gi0/42 in err-disable state Aug 29 07:10:49.833: %PM-4-ERR_RECOVER: Attempting to recover from link-flap err-disable state on Gi0/42 Aug 29 07:13:59.122: %PM-4-ERR_DISABLE: link-flap error detected on Gi0/42, putting Gi0/42 in err-disable state Aug 29 07:14:29.120: %PM-4-ERR_RECOVER: Attempting to recover from link-flap err-disable state on Gi0/42 ErrDisable Reason Timer Status ----------------- -------------- bpdug
putting interfaces in err disable Thread Tools Show Printable Version Subscribe to this Thread… Trifidw Senior Member Join Date Jun 2008 Location UK Posts 276 Certifications A+ Technician, CCNA, CCNP 06-19-201011:29 AM #1 Spanning tree putting interfaces in err disable As I am studying for the BCMSN/switching exam this problem has interested me. Below is a short example of the topology, with multilayer switch 1 as the root bridge. The switches at the top reside in a server rack connected redundantly at 10Gb. The switches to the right reside in another rack and the switch at the bottom is the access layer. Originally the 10Gb switches were connected to multilayer switch 0 only. When they were connected to the root bridge as well, the 40Gb between the 2 cores went into error disable and spanning tree reconverged across the whole network. Now I assume the BPDU's met at the 40Gb link and so is where it decided to stop the loop with out taking into consideration path costs to the root bridge and speed of the links? If the 10Gb switches were connected to the root bridge first and then to the secondary, would the 40Gb link still have gone into error disable? How would you go about ensuring the 40Gb link never goes into error disable/blocked due to spanning tree, while ensuring you never get a loop with the redundant network? Would BPDU filter on the port group ensure the loop is then blocked in the correct location (as shown in the picture)? The book states you should only enable it on ports that have a single host connected and loops are impossible. Which obviously isn't the case. Quote Login/register to remove this advertisement. billscott92787 Senior Member Join Date Nov 2008 Location Martinsburg, WV Posts 930 Certifications CCNP, CCDP, CCNA, CCNA: Wireless, C|EH, C|HFI, Cloud+, Masters - Information Security and Assurance, B.S. Networking and Comm. Mgmt. 06-19-201011:40 AM #2 IS the 40GB etherchannel betwe