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User’s Manual of SGSD-1022 / SGSD-1022P
SGSW-2840 / SGSW-2840P
306
4.11.13 Access Control Lists
Access Control Lists (ACL) provide packet filtering for IP frames (based on address, protocol, Layer 4 protocol port number or
TCP control code) or any frames (based on MAC address or Ethernet type). To filter incoming packets, first create an access list,
add the required rules, and then bind the list to a specific port.
Configuring Access Control Lists –
An ACL is a sequential list of permit or deny conditions that apply to IP addresses, MAC addresses, or other more specific
criteria. This switch tests ingress or egress packets against the conditions in an ACL one by one. A packet will be accepted as
soon as it matches a permit rule, or dropped as 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.
The following filtering modes are supported:
• 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, packets can also be filtered 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).
Command Usage
The following restrictions apply to ACLs:
• The maximum number of ACLs is 32.
• Each ACL can have up to 100 rules. However, due to resource restrictions, the average number of rules bound to the ports
should not exceed 20.
The order in which active ACLs are checked is as follows:
• User-defined rules in the Egress IP ACL for egress ports.
• User-defined rules in the Ingress IP ACL for ingress ports.
• Explicit default rule (permit any any) in the ingress IP ACL for ingress ports.
• If no explicit rule is matched, the implicit default is permit all.
4.11.13.1 ACL Configuration
Use the ACL Configuration page to designate the name and type of an ACL.