There is nothing special to do
class-map match-all VIP-122-FTP
2 match virtual-address 192.168.20.122 tcp eq ftp
policy-map type loadbalance first-match SF_FTP_Linux1
class class-default
serverfarm linux1
policy-map multi-match SLB1
class VIP-122-FTP
loadbalance vip inservice
loadbalance policy SF_FTP_Linux1
inspect ftp
service-policy input SLB1
This works fine for me.
What version do you run ?
Did you get a trace to see what is going on ?
Gilles.