32-16
Catalyst 3750 Switch Software Configuration Guide
OL-8550-02
Chapter 32 Configuring Network Security with ACLs
Configuring IPv4 ACLs
To remove a named standard ACL, use the no ip access-list standard name global configuration
command.
Beginning in privileged EXEC mode, follow these steps to create an extended ACL using names:
To remove a named extended ACL, use the no ip access-list extended name global configuration
command.
When you are creating standard extended ACLs, remember that, by default, the end of the ACL contains
an implicit deny statement for everything if it did not find a match before reaching the end. For standard
ACLs, if you omit the mask from an associated IP host address access list specification, 0.0.0.0 is
assumed to be the mask.
Step 3
deny {source [source-wildcard] | host source |
any} [log]
or
permit {source [source-wildcard] | host source
| any} [log]
In access-list configuration mode, specify one or more conditions
denied or permitted to decide if the packet is forwarded or dropped.
• host source—A source and source wildcard of source 0.0.0.0.
• any—A source and source wildcard of 0.0.0.0
255.255.255.255.
Step 4
end Return to privileged EXEC mode.
Step 5
show access-lists [number | name] Show the access list configuration.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
ip access-list extended name Define an extended IPv4 access list using a name, and enter
access-list configuration mode.
The name can be a number from 100 to 199.
Step 3
{deny | permit} protocol {source
[source-wildcard] | host source | any}
{destination [destination-wildcard] | host
destination | any} [precedence precedence]
[tos tos] [established] [log] [time-range
time-range-name]
In access-list configuration mode, specify the conditions allowed
or denied. Use the log keyword to get access list logging messages,
including violations.
See the “Creating a Numbered Extended ACL” section on
page 32-11 for definitions of protocols and other keywords.
• host source—A source and source wildcard of source 0.0.0.0.
• host destination—A destination and destination wildcard of
destination 0.0.0.0.
• any—A source and source wildcard or destination and
destination wildcard of 0.0.0.0 255.255.255.255.
Step 4
end Return to privileged EXEC mode.
Step 5
show access-lists [number | name] Show the access list configuration.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.
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