The kernel on the controller (e.g., Routing Engine) is having difficulty communicating with the PFE (Packet Forwarding Engine).
The problem related to this syslog message is described in the following sections:
The KERNEL: rdp retransmit error message is logged whenever the kernel on the controller is having difficulty communicating with the Packet Forwarding Engine (PFE).
When the kernel is having some difficulty communicating with the PFE, the system will log a syslog message that will look similar to one of the following examples:
/kernel: rdp retransmit error: No route to host (65) src 1:1020 dest 9:40967
/kernel: rdp retransmit error: No buffer space available (55) src 0x3e000101:1020 dest 0x00000013:48130
/kernel: rdp retransmit error: Network is down (50) src 0x00000001:985 dest 0x00000032:50176
This message is normal to see under some circumstances, such as a reboot or upgrade, or if some component goes down or is restarted.
This message is sometimes also seen during a hardware failure; but in such circumstances, it is a symptom of the failure, not a cause. The hardware failure should generate other messages and symptoms that are best investigated on their own merits.
Examine the following outputs:
show log chassisd
show log messages
Was any component restarted (or the whole device rebooted)? If so, the messages should clear out after a time.
This message is informational and does not, by itself, necessarily indicate a problem.
Perform the following steps:
- If the message repeats and does not clear itself out, does the second part of the message (after “rdp retransmit error:”) provide any clues to what might be preventing the communication?
- If the answer is difficult to ascertain, open a case with your technical support representative.
Generally, this message is informational, indicating a breakage of internal communication between the kernel and the PFE, and does not, by itself, necessarily indicate a problem.