This command sets the uRPF verification mode for the routing interface.
The same command works for both IPv4 and IPv6 interfaces.
| Format | ip verify unicast source reachable-via {any | rx} [allow-default] |
| Mode | Interface Config |
| Parameter | Description |
|---|---|
| any | The uRPF verification mode is set to loose. In any mode, a check is performed to see if the source address is reachable in the routing table and when found the packet is forwarded. |
| rx | The uRPF verification mode is set to strict. In rx mode, a check is performed to see if the source address is reachable in the routing table via the same interface as to where the packet was received and when both these conditions are met the packet is forwarded. |
| allow-default | Include IP addresses not specifically contained in the routing table. When allow-default is set in loose mode (any), if the source IP address is not found but a default route is present in the table, the uRPF check will pass. When allow-default is set in strict mode rx), it will prevent the incoming packet's source IP address to have a route out of a different interface than received. The strict mode option with the default route is used typically on the upstream interface. |
