Troubleshooting Gre - HP 10500 Series Configuration Manual

0 output error
# From Switch B, ping the IP address of VLAN-interface 100 on Switch A.
[SwitchB] ping 10.1.1.1
PING 10.1.1.1: 56
Reply from 10.1.1.1: bytes=56 Sequence=1 ttl=255 time=3 ms
Reply from 10.1.1.1: bytes=56 Sequence=2 ttl=255 time=2 ms
Reply from 10.1.1.1: bytes=56 Sequence=3 ttl=255 time=2 ms
Reply from 10.1.1.1: bytes=56 Sequence=4 ttl=255 time=2 ms
Reply from 10.1.1.1: bytes=56 Sequence=5 ttl=255 time=3 ms
--- 10.1.1.1 ping statistics ---
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 2/2/3 ms

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 83 Network diagram
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
Execute the display ip routing-table command on Device A and Device C to view whether Device
•
A has a route over tunnel 0 to 10.2.0.0/16 and whether Device C has a route over tunnel 0 to
10.1.0.0/16.
If such a route does not exist, execute the ip route-static command in system view to add the route.
•
Take Device A as an example:
[DeviceA] ip route-static 10.2.0.0 255.255.0.0 tunnel 0
data bytes, press CTRL_C to break
Figure 83.
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