3Com S7906E Command Reference Manual page 659

View
Tunnel interface view
Default Level
2: System level
Parameters
ipv6-ipv4: Sets the tunnel to an IPv6 manual tunnel.
ipv6-ipv4 6to4: Sets the tunnel to IPv6 over IPv4 6to4 tunnel.
ipv6-ipv4 isatap: Sets the tunnel to an IPv6 over IPv4 ISATAP tunnel.
Description
Use the tunnel-protocol command to configure the tunnel mode.
Use the undo tunnel-protocol to restore the default tunnel mode.
By default, the tunnel is a IPv6 manual tunnel.
Note that:
A proper tunnel mode can be selected for packet encapsulation according to the network topology
and application. The same tunnel mode must be configured at both ends of the tunnel. Otherwise,
packet delivery will fail.
Only one automatic tunnel can be configured at the same tunnel source.
Examples
# Specify the tunnel mode as IPv6 over IPv4 6to4 tunnel interface.
<Sysname> system-view
[Sysname] interface tunnel 2/0/2
[Sysname-Tunnel2/0/2] tunnel-protocol ipv6-ipv4 6to4
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