Simple Loop Prevention Protocol: Difference between revisions

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{{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 by [[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==

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== Further reading ==

* {{cite journalweb

|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

|accessdateaccess-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)]

* [httphttps://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]