SNR S2940-8G-v2, Configuration Manual

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SNR S2940-8G-v2 Switch Configuration Guide
ACL Configuration
Chapter 43
ACL Configuration
43.1 Introduction to ACL
ACL (Access Control List) is an IP packet filtering mechanism employed in switches, providing
network traffic control by granting or denying access the switches, effectively safeguarding the
security of networks. The user can lay down a set of rules according to some information specific
to packets, each rule describes the action for a packet with certain information matched: 'permit'
or 'deny'. The user can apply such rules to the incoming direction of switch ports, so that data
streams in the incoming direction of specified ports must comply with the ACL rules assigned.
43.1.1 Access-list
Access-list is a sequential collection of conditions that corresponds to a specific rule. Each rule
consist of filter information and the action when the rule is matched. Information included in a rule
is the effective combination of conditions such as source IP, destination IP, IP protocol number and
TCP port, UDP port. Access-lists can be categorized by the following criteria:
• Filter information based criterion: IP access-list (layer 3 or higher information), MAC
access-list (layer 2 information), and MAC-IP access-list (layer 2 or layer 3 or higher).
• Configuration complexity based criterion: standard and extended, the extended mode
allows more specific filtering of information.
• Nomenclature based criterion: numbered and named.
Description of an ACL should cover the above three aspects.
43.1.2 Access-group
When a set of access-lists are created, they can be applied to traffic of incoming direction on all
ports. Access-group is the description to the binding of an access-list to the incoming direction on a
specific port. When an access-group is created, all packets from in the incoming direction through
the port will be compared to the access-list rule to decide whether to permit or deny access.
The current firmware only supports ingress ACL configuration.
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