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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

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See also

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References

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Further reading

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  • Lin, Chuh Yu; Lapuh, Roger (October 4, 2007). "United States Patent 20070230357". Free Patents Online. Retrieved 3 Sep 2011.
  • Simple Loop Prevention Protocol[dead link] 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
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IEEE 802.1aq

Spanning Tree Protocols: IEEE 802.1D STP, IEEE 802.1w RSTP, and IEEE 802.1s MSTP. These block any redundant paths that can result in a switching loop, whereas