Understanding Acls; Supported Acls - Cisco Catalyst 3560-X Software Configuration Manual
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- Command reference manual (1188 pages) ,
- Software configuration manual (1438 pages) ,
- Manual (276 pages)
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Understanding ACLs
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Understanding ACLs
Packet filtering can help limit network traffic and restrict network use by certain users or devices. ACLs
filter traffic as it passes through a router or switch and permit or deny packets crossing specified
interfaces or VLANs. An ACL is a sequential collection of permit and deny conditions that apply to
packets. When a packet is received on an interface, the switch compares the fields in the packet against
any applied ACLs to verify that the packet has the required permissions to be forwarded, based on the
criteria specified in the access lists. One by one, it tests packets against the conditions in an access list.
The first match decides whether the switch accepts or rejects the packets. Because the switch stops
testing after the first match, the order of conditions in the list is critical. If no conditions match, the
switch rejects the packet. If there are no restrictions, the switch forwards the packet; otherwise, the
switch drops the packet. The switch can use ACLs on all packets it forwards, including packets bridged
within a VLAN.
You configure access lists on a router or Layer 3 switch to provide basic security for your network. If
you do not configure ACLs, all packets passing through the switch could be allowed onto all parts of the
network. You can use ACLs to control which hosts can access different parts of a network or to decide
which types of traffic are forwarded or blocked at router interfaces. For example, you can allow e-mail
traffic to be forwarded but not Telnet traffic. ACLs can be configured to block inbound traffic, outbound
traffic, or both.
An ACL contains an ordered list of access control entries (ACEs). Each ACE specifies permit or deny
and a set of conditions the packet must satisfy in order to match the ACE. The meaning of permit or deny
depends on the context in which the ACL is used.
The switch supports IP ACLs and Ethernet (MAC) ACLs:
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This switch also supports quality of service (QoS) classification ACLs. For more information, see the
"Classification Based on QoS ACLs" section on page
These sections contain this conceptual information:
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Supported ACLs
The switch supports three types of ACLs to filter traffic:
Note
On switches running the LAN base feature set, router ACLs are supported only on SVIs and VLAN maps
are not supported.
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
1-2
Using VLAN Maps with Router ACLs, page 1-40
Displaying IPv4 ACL Configuration, page 1-44
IP ACLs filter IPv4 traffic, including TCP, User Datagram Protocol (UDP), Internet Group
Management Protocol (IGMP), and Internet Control Message Protocol (ICMP).
Ethernet ACLs filter non-IP traffic.
Supported ACLs, page 1-2
Handling Fragmented and Unfragmented Traffic, page 1-6
ACLs and Switch Stacks, page 1-7
Chapter 1
Configuring Network Security with ACLs
1-7.
OL-25303-03
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