Clearing IPv6 Tunnel Statistics
You can clear statistics (reset all fields to zero) for all IPv6 tunnels or for a specific tunnel interface.
For example, to clear statistics for tunnel 1, enter the following command at the privileged EXEC level or any of the configuration levels of the CLI.
device# clear ipv6 tunnel 1
To clear statistics for all IPv6 tunnels, enter the following command.
device# clear ipv6 tunnel