Simple Loop Prevention Protocol: Difference between revisions

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

{{redirect|SLPP}}

{{refimprove|date=May 2019}}

'''Nortel Simple Loop Prevention Protocol''' ('''SLPP)''') in [[computer networking]] is a [Data[data link layer|layer 2]] protocol inventeteddeveloped 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 a 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 shutdownshut down.

==Compatible equipment==

* [[Avaya VSP 9000 Series]] - Software version 3.0 or above

* ERS-8600 - Software version 4.1 or above<ref>[http://www.nortel.com/products/01/passport/8600/collateral/nn117720.pdf Nortel Enterprise Converged Networking]</ref>

* ERS-8300[[Avaya VSP 7000 Series]] - Software version 410.0 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

==CommandsSee also==

* [[VLACP]]

''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

==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://michaelfmcnamarablog.blogspotmichaelfmcnamara.com/2007/12/simple-loop-protectionprevention-protocol-slpp.html/ 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]

==SeeExternal alsolinks==

{{PortalWiktionary|NortelSLPP}}

* [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]

*[[VLACP]]

*[[SMLT]]

*[[RSMLT]]

*[[Loop (telecommunication)]]

{{Avaya}}

==External links==

{{Wiktionarypar|SLPP}}

{{telecom-stub}}

*[http://michaelfmcnamara.blogspot.com/2007/12/simple-loop-protection-protocol-slpp.html Simple Loop Prevention Protocol (SLPP)]

*[http://www.nortel.com/products/01/passport/collateral/p2007_0236_ers_8300_v40_ga.pdf Ethernet Routing Switch 8300 v4.0 General Availability]

*[http://www142.nortelnetworks.com/techdocs/ERS8300_4_0/pdf/NN46200-200_03.01_PE.pdf Nortel Ethernet Routing Switch 8300 Planning and Engineering — Network Design]

[[Category:Avaya]]

[[Category:Nortel protocols]]

[[Category:Link protocols]]