Avaya 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 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[edit]

  • 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[edit]

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[edit]

References[edit]

Further reading[edit]

External links[edit]