Identifies the protocol used to setup and
administer this Phase-2 IPsec tunnel.
In case this tunnel was spawned by an IPsec
signaling protocol, this MIB object contains the
value of the object 'cisgIpsSgProtocol' defined
in CISCO-IPSEC-SIGNALING-MIB in the table
'cisgIpsSgTunnelTable' in the row corresponding
to the control tunnel.
A value of 'cpManual' is indicative of a
manually installed and administered Phase-2
tunnel.