execute : vpn ipsec tunnel down
 
vpn ipsec tunnel down
Use this command to shut down an IPsec VPN tunnel.
Syntax
execute vpn ipsec tunnel down <phase2> [<phase1> <phase2_serial>]
where:
<phase2> is the phase 2 name
<phase1> is the phase 1 name
<phase2_serial> is the phase 2 serial number
<phase1> is required on a dial-up tunnel.