Packet Loss; Symptom; Solution - HP HSR6600 Troubleshooting Manual

5. In probe view, execute the display hardware internal fdp cdat slot slot-num statistics 8 command
to view the packet loss statistics of the CPU and the logic module. Contact HP Support to learn the
causes for the packet loss.
6. In probe view, execute the debugging hardware internal fdp cdat slot slot-num bypass interface
command to enable bypass logic on the interface where the packets to be forwarded are received.
If traffic can be forwarded correctly after the feature is enabled, an error has occurred to the logic
module. Contact HP Support to diagnose the problem.
7. In probe view, execute the display hardware internal fdp cdat slot slot-num statistics 80 command
to view statistics of the logic module. If packet drops exist, contact HP Support to learn the causes.
8. In probe view, execute the display hardware internal fdp cdat slot slot-num status 80 command to
view statistics of the logic module. If the FIFO status is not empty when there is no traffic, the FIFO
queue is congested. Contact HP Support to diagnose the problem.
9. If the logic module and the CPU can correctly send and receive packets, use the software
forwarding diagnostic techniques to diagnose the problem. For example, verity that the correct
routing entry exists in the routing table.
10. If the problem persists, contact HP Support.

Packet loss

Symptom

A large number of packets are dropped by the FIP-600 LPU during the forwarding process.

Solution

To resolve the problem:
1. In probe view, execute the display hardware internal fdp cdat slot slot-num statistics command to
view the packet statistics of the CPU data channel. The following conditions might exist:
If the packet output rate and input rate are approximately the same, the packets are forwarded

by the logic module to the CPU for normal forwarding.
If the packet input rate is significantly lower than the output rate, the packets are not sent to the

CPU.
2. If the packets are sent to the CPU, execute the following command in probe view to view the
debugging information of packets sent and received by the CPU data channel interface:
debugging hardware internal fdp cdat slot slot-num debug { ingress | egress }
The first 32 bytes represent the header fields, followed by 32 bytes of payload. You can filter the
packets to be displayed based on criteria such as interface or packet length.
To learn the causes why the packets are sent to the CPU, contact HP Support.
3. If the packets are dropped by the logic module before being sent to the CPU, execute the display
hardware internal fdp cdat slot slot-num statistics 8 command in probe view to view the packet loss
statistics of the logic module. Contact HP Support to learn the causes for the packet loss.
4. In probe view, execute the display hardware internal fdp cdat slot slot-num statistics 80 command
to view statistics of the logic module. If packet drops exist, contact HP Support to learn the causes
for the packet drops.
5. If the problem persists, contact HP Support.
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