Configuring Ipv4 Acls; Creating Standard And Extended Ipv4 Acls - Cisco Catalyst 2975 Software Configuration Manual

Configuring IPv4 ACLs

Configuring IPv4 ACLs
Configuring IP v4ACLs on the switch is the same as configuring IPv4 ACLs on other Cisco switches and
routers. The process is briefly described here. For more detailed information on configuring ACLs, see
the "Configuring IP Services" section in the "IP Addressing and Services" chapter of the Cisco IOS IP
Configuration Guide, Release 12.2. For detailed information about the commands, see the Cisco IOS IP
Command Reference, Volume 1 of 3: Addressing and Services, Release 12.2. The Cisco IOS
documentation is available from the Cisco.com page under Documentation > Cisco IOS Software >
12.2 Mainline > Configuration Guides or Command References.
The switch does not support these Cisco IOS router ACL-related features:
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These are the steps to use IP ACLs on the switch:
Step 1 Create an ACL by specifying an access list number or name and the access conditions.
Apply the ACL to interfaces or terminal lines.
Step 2
These sections contain this configuration information:
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Creating Standard and Extended IPv4 ACLs

This section describes IP ACLs. An ACL is a sequential collection of permit and deny conditions. One
by one, the switch tests packets against the conditions in an access list. The first match determines
whether the switch accepts or rejects the packet. Because the switch stops testing after the first match,
the order of the conditions is critical. If no conditions match, the switch denies the packet.
The software supports these types of ACLs or access lists for IPv4:
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Catalyst 2975 Switch Software Configuration Guide
31-6
Non-IP protocol ACLs (see
IP accounting
Inbound and outbound rate limiting (except with QoS ACLs)
Reflexive ACLs or dynamic ACLs (except for some specialized dynamic ACLs used by the switch
clustering feature)
ACL logging
Creating Standard and Extended IPv4 ACLs, page 31-6
Applying an IPv4 ACL to a Terminal Line, page 31-17
Applying an IPv4 ACL to an Interface, page 31-18
Hardware and Software Treatment of IP ACLs, page 31-19
Troubleshooting ACLs, page 31-19
IPv4 ACL Configuration Examples, page 31-20
Standard IP access lists use source addresses for matching operations.
Extended IP access lists use source and destination addresses for matching operations and optional
protocol-type information for finer granularity of control.
Table 31-1 on page 31-7) or bridge-group ACLs
Chapter 31 Configuring Network Security with ACLs
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