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Line 1: {{Short description\|Protocol developed by Nortel to protect against Layer 2 network loops}} {{refimprove\|date=May 2019}} '''Simple Loop Prevention Protocol''' ('''SLPP''') in [[computer networking]] is a [[data link layer]] protocol developed by [[Nortel]] (previously acquired by [[Avaya]], now a part of [[Extreme Networks]]) to protect against Layer 2 network loops. SLPP uses a small hello packet to detect network loops. The SLPP protocol checks packets from the originating switch and the peer switch in a [[SMLT]] configuration. Sending hello packets on a per VLAN basis allows SLPP to detect VLAN based network loops for un-tagged as well as tagged IEEE 802.1Q VLAN link configurations. If a loop is detected, the associated port is shut down. Line 18 ⟶ 19: == Further reading == * {{cite ~~journal~~web \|title = United States Patent 20070230357 \|~~authors~~ author= Lin, Chuh Yu ~~(San Jose, CA, US),~~ \|author2=Lapuh, Roger ~~(Uesslingen, CH)~~ \|website=Free Patents Online ~~\|publisher = [[United States Patent and Trademark Office]]~~ \|date = October 4, 2007 \|url = http://www.freepatentsonline.com/y2007/0230357.html \|~~accessdate~~access-date = 3 Sep 2011 }} * [http://www.google.com/patents?hl=en&lr=&vid=USPATAPP11394816&id=Wz-hAAAAEBAJ&oi=fnd&dq=%22Simple+Loop+Prevention+Protocol%22&printsec=abstract#v=onepage&q=%22Simple%20Loop%20Prevention%20Protocol%22&f=false Simple Loop Prevention Protocol]{{dead link\|date=January 2025\|bot=medic}}{{cbignore\|bot=medic}} Google Patents * [http://blog.michaelfmcnamara.com/2007/12/simple-loop-prevention-protocol-slpp/ Simple Loop Prevention Protocol (SLPP)] * [~~http~~https://unreachabledestination.blogspot.com/2009/08/nortel-simple-loop-prevention-protocol_2667.html Nortel "Simple Loop Prevention Protocol" (SLPP)] * [http://support.avaya.com/css/P8/documents/100100707 Switch Clustering Design Best Practices] * [https://web.archive.org/web/20111003174710/http://blog.axiomdynamics.com/2011_07_01_archive.html Quick Nortel MLT (Link Aggregation) Reference]