<dt><code>gre64</code></dt>
<dd>
+ GRE64 tunnel protocol is deprecated and will be removed from OVS
+ v2.5 release.
It is same as GRE, but it allows 64 bit key. To store higher 32-bits
of key, it uses GRE protocol sequence number field. This is non
standard use of GRE protocol since OVS does not increment
<dt><code>ipsec_gre64</code></dt>
<dd>
+ GRE64 tunnel protocol is deprecated and will be removed from OVS
+ v2.5 release.
Same as IPSEC_GRE except 64 bit key.
</dd>