Ip Traces - Apollo VioNet 3000 series User Manual And Instruction Manual

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IP+
9.1

IP Traces

The IP traces are as follows:
IP.001 This message is generated when the forwarder must discard a packet that was not forwarded via the IP cache
because of an input queue overflow. Note that this event does not get counted in ELS, it is instead counted in
the IP console.
The counters (kept per input network) can be read using the IP>COUNTERS command.
Cause Input queue overflows happen when a packet is received from an interface that is short on buffers,
the destination is not in the IP cache, and the length of the IP queue is greater than the fair share.
This may be caused by either a burst or steady state of traffic arriving faster than the IP forwarder
can forward it.
Action Reduce traffic bursts. Upgrade to a faster router.
Cause Excessive IP routing cache misses, causing most IP packets to go through the cache miss
forwarder.
Action Increase the size of the IP cache.
IP.002 This message is generated when a packet has an incorrect version number.
Cause Most likely, this packet was damaged since there should be no other versions of IP running.
Action If the problem persists, examine a line trace to determine where the packet is being damaged.
IP.003 This message is generated when a packet's indicated header length is below the minimum possible length.
Cause Most likely, this is a damaged packet. It may be that another node is building an incorrect header.
Action If the problem persists, examine a line trace to determine where the packet is being damaged.
IP.004 This message is generated when a packet has an invalid checksum. The received checksum, together with
the correct checksum, are displayed.
Cause Most likely, this is a damaged packet. It may be that another node is building an incorrect header.
Action If the problem persists, examine a line trace to determine where the packet is being damaged.
IP.005 This message is generated when the packet length specified in the header is greater than the packet buffer
length.
Cause Packet corruption in transit.
Action If problem persists, check networks and routers.
Cause Programming error in remote note.
IP.006 An attempt was made to send the packet on the specified network, but it was not accepted for transmission
on that network. The reason_code indicates why the packet was not accepted. If the reason was flow-
control, an ICMP source quench will be sent to the sender, otherwise an ICMP destination unreachable will
be sent.
Cause Miscellaneous handler error. (Reason code 1).
Action Check for error messages from handler for network_name.
Cause Output queue overflow, or other flow control. (Reason code 2).
Action Alleviate congestion.
Cause Network down. (Reason code 3).
Action See why handler thinks network is down.
Cause Dropped by handler to avoid looping, or bad broadcast. (Reason code 4).
Action Check configuration.
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