This article explains the meaning of the "Failed to send the packet" syslog message and whether any action must be taken following the message.

The following syslog messages are logged:

member0-fpc1 Failed to send the packet (discard), ifl:65, to SFI
member0-fpc1 Failed to send the packet (discard), ifl:65, to SFI 

The syslog message may be logged when the message pipe between the Software Forwarding Infrastructure (SFI) and PFEM is full or when the SFI is busy at that point in time when the traffic is received.

These syslog messages are related to L3 next-hop resolution. When the switch receives traffic that is destined to an IP address on one of the subnets that it is directly connected to and the Address Resolution Protocol (ARP) for that IP address is not resolved, the packet is trapped to the control plane to get the ARP resolved. During this process of ARP resolution, the first packet is cached in SFID, and after the resolution completes (successfully or otherwise), PFEM informs SFI of the event. SFI then reinserts the packet if the resolution is successful. It discards the packet if resolution failed.

Although the ARP's programming in the data plane is not affected due to these messages, the SFI-cached packet that is destined towards that ARP-entry may get dropped, leading to the message.

No action is required. These are informational messages that can be safely ignored unless any service impact is observed.