I'm diging attack the "A11" session at the grass-roots.
[Layer 2 Tunnel Protocol]
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120t/120t1/l2tpt.htm
[Layer 2 Tunnel Protocol]
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120t/120t1/l2tpt.htm