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Access Control List Commands
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 packets,
first create an access list, add the required rules, specify a mask to modify
the precedence in which the rules are checked, and then bind the list to a
specific port.
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.
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
Summary of Contents for 8708L2
Page 2: ......
Page 24: ...TABLES xxiv ...
Page 28: ...FIGURES xxviii ...
Page 290: ...CONFIGURING THE SWITCH 3 238 ...
Page 584: ...COMMAND LINE INTERFACE 4 294 ...
Page 592: ...TROUBLESHOOTING B 4 ...
Page 605: ......