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'''Simple Loop Prevention Protocol''' ('''SLPP''') in [[computer networking]] is a [[Data link layer|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.▼
▲'''Simple Loop Prevention Protocol''' (SLPP) in [[computer networking]] is a [[Data link layer|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==
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: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
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: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==
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