How does an S series switch process ARP and MAC address entries when the STP topology changes

When the STP topology changes, an S series switch (except the S1700) processes ARP and MAC address entries as follows:
1. By default, all ports enter the Discarding state after STP is enabled. When the STP topology changes, dynamic ARP entries and MAC addresses on all ports are deleted.
2. When a port enters the Discarding state during normal running of the system, dynamic ARP and MAC address entries on the port are deleted. In addition, the device sends a TC packet to the upstream device, requesting it to delete the dynamic ARP and MAC address entries. When the root node receives the TC packet, the topology of the entire network converges.

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