On a Layer 2 network deployed with STP, a topology change causes generation of TC packets which are flooded on the network. Upon receiving the TC packets, NE80E performs corresponding actions according to the configured STP convergence mode as follows:
1. If STP convergence is in fast mode, NE80E deletes related ARP table entries upon receiving TC packets. ARP entries are re-created based on received data flows.
2. If STP convergence is in normal mode, NE80E sets the TTL for related ARP table entries to 0 upon receiving TC packets. The ARP ages these entries.The STP convergence on the IDC network is in normal mode. Therefore, NE80E keeps deleting ARP table entries when the network topology changes frequently, resulting in service interruption.