Why Change the Existing Model?
As discussed earlier, the automatic check preventing more than one VLAN interface between the MSFC and the FWSM is extremely valuable to prevent accidental security holes. However, there are a few scenarios in which being able to bypass that check is required. CatOS release 7.6(1) or higher and Supervisor IOS 12.2(14)SY has the option of turning on the ability of multiple SVI interfaces to bypass the check. The commands used for both CatOS and Sup IOS are listed in Table 4-5.