The arp topology-change disable command disables the device from responding to TC BPDUs. That is, the device does not age or delete ARP entries when receiving TC BPDUs.
The undo arp topology-change disable command enables the device to respond to TC BPDUs.
By default, the device is enabled to respond to TC BPDUs. The device ages or deletes ARP entries when receiving TC BPDUs.
Usage Scenario
When STP detects network topology changes, the device sends TC BPDUs to instruct the ARP module to age or delete ARP entries. The device then needs to relearn ARP entries.
If the network topology changes frequently or there are many ARP entries on the network, ARP entry relearning will cause excess ARP packets to be generated. As a result, a large number of system resources are occupied and services are affected. To address this issue, run the arp topology-change disable command to disable the device from responding to TC BPDUs. The device does not age or delete ARP entries even if the network topology changes.
Precautions
After the device is disabled from responding to TC BPDUs using the arp topology-change disable command, it does not age or delete ARP entries when the network topology changes. If the MAC address-triggered ARP entry update function is not enabled, user services may be interrupted because the device does not update the saved ARP entries in real time. In this case, you are advised to run the mac-address update arp command to enable the MAC address-triggered ARP entry update function.