Something

altq on $ext_if bandwidth 8Mb queue { std, ssh, web, gaming, irc}

queue std       bandwidth 1Mb cbq(default)
queue ssh       bandwidth 1Mb { ssh_login, ssh_bulk }
    queue ssh_login bandwidth 25% priority 5 cbq(ecn)
    queue ssh_bulk  bandwidth 75% priority 5 cbq(ecn)
queue gaming    bandwidth 4Mb priority 4 cbq(ecn)
queue irc       bandwidth 1Mb priority 3 cbq(borrow red)
queue web       bandwidth 2Mb priority 2 cbq(borrow red)