Simple Loop Prevention Protocol

{{Short description|Protocol developed by Nortel to protect against Layer 2 network loops}} {{more citations needed|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.

==Compatible equipment== * Avaya VSP 9000 Series - Software version 3.0 or above * Avaya VSP 7000 Series - Software version 10.0 or above * Avaya ERS 8600 - Software version 4.1 or above<ref>[http://www.nortel.com/products/01/passport/8600/collateral/nn117720.pdf Nortel Enterprise Converged Networking] {{webarchive |url=https://web.archive.org/web/20080225063438/http://www.nortel.com/products/01/passport/8600/collateral/nn117720.pdf |date=February 25, 2008 }}</ref> * Avaya ERS-8300 - Software version 4.0 or above * Avaya ERS-5000 - Software version 6.3 or above * Avaya ERS 4000 series - Software version 5.6.2 or above * Avaya ERS-3500 - Software version 5.2.0 or above

==See also== * VLACP

==References== {{reflist}}

== Further reading == * {{cite web |title = United States Patent 20070230357 |author=Lin, Chuh Yu |author2=Lapuh, Roger |website=Free Patents Online |date = October 4, 2007 |url = http://www.freepatentsonline.com/y2007/0230357.html |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)] * [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] * [http://support.avaya.com/css/P8/documents/100100707 Switch Clustering Design Best Practices]

==External links== {{Wiktionary|SLPP}} * [http://support.avaya.com/css/P8/documents/100101601 Switch Clustering using Split Multi-Link Trunking (SMLT) with ERS 8600, 8300, 5x00 and 1600 Series Technical Configuration Guide]

Category:Avaya Category:Nortel protocols Category:Link protocols