Why the redirect packets dropped when next-hop is not available

Hello,

This is because the function of discarding IP packets that match no routing entry is enabled by default.

On the S5720-EI, S6720-EI, and S6720S-EI, when both the ipv4 destination-unreachable drop command and the traffic policy command are run, both the drop action and the redirection action take effect. The ICMP redirection packets are discarded because the drop action has a higher priority than the redirection action. This leads to a redirection failure for ICMP packets. To make the redirection action for ICMP packets effective, run the undo ipv4 destination-unreachable drop command to disable the drop action. However, disabling the drop action will degrade the attack defense performance of the system. You must configure the two actions properly according to the network requirements.

For details, please refer to https://support.huawei.com/hedex/hdx.do?docid=EDOC1100101074&id=EN-US_CLIREF_0177115162&lang=en

Any further questions, let us know!