H3C Technologies H3C S12500 Series Switches - Manual (Page 185)

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Troubleshooting tunneling configuration
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Symptom
A tunnel interface configured with related parameters such as tunnel source address, tunnel destination
address, and tunnel mode cannot go up.
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Analysis
The physical interface of the tunnel does not go up, or the tunnel destination is unreachable.
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Solution
1. Use the display interface or display ipv6 interface commands to check whether the physical
interface of the tunnel is up. If the physical interface is down, check the network connection.
2. Use the display ipv6 routing-table or display ip routing-table command to check whether the
tunnel destination is reachable. If the route is not available, configure a route to reach the tunnel
destination.