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Simple Loop Prevention Protocol

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Simple Loop Prevention Protocol (SLPP) in computer networking is a 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.

Compatible equipment

  • VSP-9000 - Software version 3.0 or above
  • VSP 7000 - Software version 10.0 or above
  • ERS-8600 - Software version 4.1 or above[1]
  • ERS-8300 - Software version 4.0 or above
  • ERS-5000 - Software version 6.3 or above
  • ERS-4000 - Software version 5.6.2 or above
  • 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

References

  1. ^ Nortel Enterprise Converged Networking Archived February 25, 2008, at the Wayback Machine

Further reading

  • "United States Patent 20070230357". United States Patent and Trademark Office. October 4, 2007. Retrieved 3 Sep 2011. {{cite journal}}: Cite journal requires |journal= (help); Unknown parameter |authors= ignored (help)
  • Simple Loop Prevention Protocol Google Patents
  • Simple Loop Prevention Protocol (SLPP)
  • Nortel "Simple Loop Prevention Protocol" (SLPP)
  • Switch Clustering Design Best Practices
  • Quick Nortel MLT (Link Aggregation) Reference
  • Switch Clustering Design Best Practices
Look up SLPP in Wiktionary, the free dictionary.
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