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Parameter None

Description Use the gre checksum command to enable the GRE packet checksum function so as to verify the validity of packets and discard those invalid packets.

Use the undo gre checksum command to disable the GRE packet checksum function.

By default, the GRE packet checksum function is disabled.

Related command: interface tunnel.

Example # Enable the GRE packet checksum function on the tunnel between Sysname1 and Sysname2.

<Sysname1> system-view [Sysname1] interface tunnel 3 [Sysname1-Tunnel3] gre checksum <Sysname2> system-view [Sysname2] interface tunnel 2 [Sysname2-Tunnel2] gre checksum

gre key

Syntax gre key key-number

undo gre key

View Tunnel interface view

Parameter key-number: Secret key for the GRE tunnel interface use, in the range 0 to 4,294,967,295.

Description Use the gre key command to configure a secret key for a GRE tunnel interface. This weak security mechanism can prevent packets from being received mistakenly.

Use the undo gre key command to remove the configuration.

By default, no secret key is configured for a GRE tunnel interface.

Related command: interface tunnel

Example # Set the secret key for the GRE tunnel interfaces to 123 on Sysname1 and Sysname2.

<Sysname1> system-view [Sysname1] interface tunnel 3 [Sysname1-Tunnel3] gre key 123 <Sysname2> system-view [Sysname2] interface tunnel 2 [Sysname2-Tunnel2] gre key 123

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3Com MSR 50, MSR 30 manual Gre key, Related command interface tunnel, Undo gre key, 1753