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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.
The order in which active ACLs are checked is as follows:
1. User-defined rules in the Egress MAC ACL for egress ports.
2. User-defined rules in the Egress IP ACL for egress ports.
3. User-defined rules in the Ingress MAC ACL for ingress ports.
4. User-defined rules in the Ingress IP ACL for ingress ports.
5. Explicit default rule (permit any any) in the ingress IP ACL for ingress
ports.
6. Explicit default rule (permit any any) in the ingress MAC ACL for ingress
ports.
7. If no explicit rule is matched, the implicit default is permit all.
Masks for Access Control Lists
You must specify masks that control the order in which ACL rules are
checked. The switch includes two system default masks that pass/filter
packets matching the permit/deny the rules specified in an ingress ACL. You
can also configure up to seven user-defined masks for an ACL. A mask must