> # Guidelines and Limitations

> Follow these guidelines when configuring IPv4-ACLs or IPv6-ACLs in any switch or director in the Cisco MDS 9000 Family:

> - You can apply IPv4-ACLs or IPv6-ACLs to VSAN interfaces, the management interface, Gigabit Ethernet interfaces on IPS modules and MPS-14/2 modules, and Ethernet PortChannel interfaces.

> Tip If IPv4-ACLs or IPv6-ACLs are already configured in a Gigabit Ethernet interface, you cannot add this interface to an Ethernet PortChannel group. See the IP Services Configuration Guide, Cisco DCNM for SAN for guidelines on configuring IPv4-ACLs.

> Caution | Do not apply IPv4-ACLs or IPv6-ACLs to only one member of a PortChannel group. Apply IPv4-ACLs or IPv6-ACLs to the entire channel group.

> - Configure the order of conditions accurately. As the IPv4-ACL or the IPv6-ACL filters are sequentially applied to the IP flows, only the first match determines the action taken. Subsequent matches are not considered. Be sure to configure the most important condition first. If no conditions match, the software drops the packet.
> - Configure explicit deny on the IP Storage Gigabit Ethernet ports to apply IP ACLs because implicit deny does not take effect on these ports.

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