Access Control List Commands - SMC Networks SMC TigerStack III SMC6824M Management Manual

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soon as it matches a deny rule. If no rules match for a list of all permit rules,
the packet is dropped; and if no rules match for a list of all deny rules, the
packet is accepted.
There are three filtering modes:
• Standard IP ACL mode (STD-ACL) filters packets based on the source IP
address.
• Extended IP ACL mode (EXT-ACL) filters packets based on source or
destination IP address, as well as protocol type and protocol port number.
If the TCP protocol is specified, then you can also filter packets based on
the TCP control code.
• MAC ACL mode (MAC-ACL) filters packets based on the source or
destination MAC address and the Ethernet frame type (RFC 1060).
The following restrictions apply to ACLs:
• 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.
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