Use this command to set the source address in the ARP probe packet for non-routing interface entries to avoid the duplicate IP 0.0.0.0 address problem. Invoking the normal form of the command (ip device tracking probe auto-source fallback host-ip mask override), the source address in the probe packet is set to a new address based on the configured host-ip, mask, and destination for each of the non-routing interface entries in the IPv4DT table.
| Default | The source IP address in the probe packet for non-routing interfaces is set to 0.0.0.0 address. |
| Format | ip device tracking probe auto-source fallback host-ip mask override |
| Mode | Global Config |
| Parameter | Description |
|---|---|
| host-ip | An IPv4 host in dotted notation (for example, 0.0.0.1). |
| mask | An IPv4 host used for the destination IP of the IPv4DT entries in dotted notation (for example, 255.255.0.0). |
Example: The following example sets the source ip address in the probe packet for non-routing interfaces.
(Switching)(Config)# ip device tracking probe auto-source fallback 0.0.0.1 255.255.255.0 override
If the probe entry is for a host IP address 10.5.5.20, then an ARP probe with source address 10.5.5.1 is generated.
