Interaction with other protocols.

  • When loop protection is enabled before STP, and if there is an L2 loop, then the loop will be detected and the port will be disabled.
  • When STP is enabled before loop protection, and if there is a L2 loop, then the port will be moved to the blocked state by STP. When a port is blocked, the loop protection packet will not reach the sending switch, and the loop will not be detected by loop protection. When multiple instances of STP are configured and different spanning trees are formed for different instances, the PSPO state will be forwarding. In this case, loop- protection will consider those ports as normal forwarding ports and will override the STP states.
  • STP is mutually exclusive with loop protection. If STP and loop protection are both enabled on the same VLAN, STP takes precedence. This means that loop protection does not take any action on a port blocked by STP.

  • MVRP and the loop protection interoperate with each other. However, dynamic VLANs cannot be tagged to a port through user configuration. Therefore, it is not possible to configure a dynamic VLAN as a loop protection enabled VLAN.
  • If MCLAG has marked a port as transmit disable (mclag_pdu_tx_disable is set to true), then loop-protect will not transmit packets on the port. Similarly, if the loop_detect_source column is set to mclag then loop protection will not re-enable the port when the re-enable timer expires on that port.