H3C Technologies H3C S10500 Series Switches - Manual (Page 192)

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Troubleshooting tunneling configuration
Symptom
After the configuration of related parameters such as tunnel source address, tunnel destination address,
and tunnel mode, the tunnel interface is still not up.
Solution
Follow these steps:
1. The common cause is that the physical interface of the tunnel source is not up. Use the display
interface tunnel or display ipv6 interface tunnel commands to view whether the physical interface
of the tunnel source is up. If the physical interface is down, check the network connections.
2. Another possible cause is that the tunnel destination is unreachable. Use the display ipv6
routing-table or display ip routing-table command to view whether the tunnel destination is
reachable. If no routing entry is available for tunnel communication in the routing table, configure
related routes.