SMC Networks SMC TigerStack III SMC6824MPE - Manual (Page 385)

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• This switch supports ACLs for both ingress and egress filtering.
However, you can only bind one IP ACL and one MAC ACL to any port
for ingress filtering, and one IP ACL and one MAC ACL to any port for
egress filtering. In other words, only four ACLs can be bound to an
interface – Ingress IP ACL, Egress IP ACL, Ingress MAC ACL and
Egress MAC ACL.
• When an ACL is bound to an interface as an egress filter, all entries in the
ACL must be deny rules. Otherwise, the bind operation will fail.
• Each ACL can have up to 32 rules.
• The maximum number of ACLs is also 32.
• However, due to resource restrictions, the average number of rules
bound the ports should not exceed 20.
• You must configure a mask for an ACL rule before you can bind it to a
port or set the queue or frame priorities associated with the rule.
• The switch does not support the explicit “deny any any” rule for the
egress IP ACL or the egress MAC ACLs. If these rules are included in
ACL, and you attempt to bind the ACL to an interface for egress
checking, the bind operation will fail.
• Egress MAC ACLs only work for destination-mac-known packets, not
for multicast, broadcast, or destination-mac-unknown packets.