Simple Loop Prevention Protocol: Difference between revisions

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

'''Simple Loop Prevention Protocol''' ('''SLPP''') in [[computer networking]] is a [[Data link layer|layer 2]] protocol invented by [[Nortel]] (now acquired by [[Avaya]]) to protect against 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. Once a loop is detected, the port is shut down.

{{refimprove|date=May 2019}}

'''Simple Loop Prevention Protocol''' ('''SLPP''') in [[computer networking]] is a [[Datadata link layer|layer 2]] protocol inventeddeveloped by [[Nortel]] (nowpreviously 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. OnceIf 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

* [[ERS 3500 and ERS 2500 series|Avaya ERS-3500]] - Software version 5.2.0 or above

==Commands==

''Commands on two core [[ERS-8600]] switches in a switch cluster.''

*ERS 8600 Core Switch A

:ERS-8610:5# config slpp add 200

:ERS-8610:5# config slpp operation enable

:ERS-8610:5# config ethernet 2/1-2/30 slpp packet-rx enable

:ERS-8610:5# config ethernet 2/1-2/30 slpp packet-rx-threshold 10

*ERS 8600 Core Switch B

:ERS-8610:5# config slpp add 200

:ERS-8610:5# config slpp operation enable

:ERS-8610:5# config ethernet 4/1-4/30 slpp packet-rx enable

:ERS-8610:5# config ethernet 4/1-4/30 slpp packet-rx-threshold 50

==See also==

* [[Avaya]]

* [[Avaya Government Solutions]]

* [[VLACP]]

* [[SMLT]]

* [[RSMLT]]

* [[Loop (telecommunication)]]

==References==

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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:80/2011_07_01_archive.html Quick Nortel MLT (Link Aggregation) Reference]

* [http://support.avaya.com/css/P8/documents/100100707 Switch Clustering Design Best Practices]

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{{Avaya}}

{{telecom-stub}}

[[Category:Avaya]]