can sshclient execute a local command ?

Hello list,

I have openssh-client __1:5.1p1-5+b1 installed in my debian box. I have remote ssh information stored in my .ssh/config file.
I have protected one remote ssh by fwknop. When I need ssh login to that particular sever I have to open the port with fwknop client installed in my local box. Is there any option in sshclient so that It can execute a local command ( here the fwknop obviously ) before doing ssh to that remote server ?

Thanks