Avaya Simple Loop Prevention Protocol

Avaya Simple Loop Prevention Protocol

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 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. Once a loop is detected, the port is shutdown.


Compatible equipment

  • ERS-8600 - Software version 4.1 or above[1]
  • ERS-8300 - Software version 4.0 or above


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


Further reading

External links

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