HP Comware 5 Debug Manual Vol 2

Tunnel0 packet: After decapsulation,

outgoing packet header 22::2->1::1(length = 104).

// After de-encapsulation, the source and destination addresses of a packet are 22::2 and 1::1,

respectively, and the packet length is 104.

# On the peer device, create a GRE tunnel, and configure parameters to make the tunnel interfaces

go up. On the local device, create no tunnel interface, and enable GRE error debugging. After a

GRE packet is received, the following debugging information is output:

<Sysname> debugging gre error

*Mar 6 11:41:40:312 2008 H3C DPGRE/7/debug:

error: Failed to find tunnel interface.

// The device is not configured with a tunnel, so GRE packets will be dropped without being

de-encapsulated.

# Create a tunnel between two devices, and set the GRE key on the local device only. Then, enable

GER error debugging on the local device. After a GRE packet is received, the following debugging

information is output:

<Sysname> debugging gre error

*May 15 15:29:06:599 2007 Sysname DPGRE/7/debug:

error: GRE key is invalid.

// The key of the received GRE packet does not match the local key.