10
10.
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.
11.
Execute the
display hardware internal nae slot
slot-num
freein
command in probe view to
collect hardware information and contact H3C Support to locate the problem.
Failure to forward traffic
Symptom
A router installed with FIP-600 modules fails to forward traffic as an intermediate device.
Solution
To resolve the problem:
1.
Ping a directly connected device. If the ping operation fails, follow the procedure described in
"
Failure to ping a directly connected device
" to resolve the problem.
2.
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 of the CPU decreases significantly, the packets are dropped or
transparently sent to the MPU.
If the packet output rate and input rate are approximately the same, the packets are sent to
the CPU for normal forwarding.
If the packet input rate is significantly lower than the packet output rate, the packets are not
sent to the CPU.
3.
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 H3C Support.
4.
If the packets are dropped, perform the following tasks:
Execute the
display hardware internal fdp cdat slot
slot-num
statistics
8 command in
probe view to view the packet loss statistics. Contact H3C Support to learn the causes for
the packet loss.
Execute the
display hardware internal fdp flow slot slot-num
statistic
command to view
statistics about the Layer 3 packets sent to the CPU. If packet error or drop exists, contact
H3C Support to diagnose the problem.
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 H3C
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 H3C 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 H3C Support to
learn the causes.
