Troubleshooting gre – H3C Technologies H3C S10500 Series Switches User Manual
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Troubleshooting GRE
The key to configuring GRE is to keep the configurations consistent. Most faults can be located by using
the debugging gre or debugging tunnel command. This section analyzes one type of fault for illustration,
with the scenario shown in
Figure 81 Troubleshoot GRE
Symptom: The interfaces at both ends of the tunnel are configured correctly and can ping each other, but
Host A and Host B cannot ping each other.
Solution:
•
On Device A and Device C, execute the display ip routing-table command in any view respectively.
On Device A, observe whether there is a route from Device A through Tunnel 0 to 10.2.0.0/16. On
Device C, observe whether there is a route from Device C through Tunnel 0 to 10.1.0.0/16.
•
If an expected static route is missing, use the ip route-static command in system view to configure.
For example, configure a static route on Device A as follows:
[DeviceA] ip route-static 10.2.0.0 255.255.0.0 tunnel 0