One of my client has a 5540 security appliance where I have configured DMZ and other few things . Currently it has 4 workable interfaces excluding management interface . 3 of them are used for data connectivity because 1 port is for failover .
Now with 3 physical interface we have 4 zones using sub interfaces ( vlans ) . Recently there has been a change in network where they have introduced few other types of servers and now there is a request to make more zones
Avaliable Data interfaces are 3
Required Zones are 7
Now this is possible using sub interfaces ( vlan ) but I want to know if this is a recommended solution to use subinterfaces at such large scale and dividing every possible interface . It is a company of 1000 users , other option could be to put an 4GE-SSM card but please let me know if the subinterfaces solution is recommended one for enterprizes ?