SLPP

Simple Loop Prevention Protocol:

• Avaya
• Hello packets to detect network loops, checks packets from originating switch and peer switch in SMLT config
• Per-VLAN basis to detect loops in untagged and tagged link configs
• SLPP Packets are sent using L2 Multicast and a switch will only look at its own or its peer SLPP packets
  
• Configured with the following criteria:

SLPP Tx Process: Which VLANS a switch should send Hello packets, then the packets are replicated out of all ports of SLPP enabled VLAN
SLPP Rx Process: Which ports on a switch should act when receiving SLPP packet by same switch or SMLT peer. Not recommended in Square or full mesh design on IST or core.
SLPP Action: The action to disable ports, can be modified by seeing how many SLPP packets are received before taking action

• If MAC's are learned through looping ports, and because STP cannot detect the config issue, SLPP will disable the port