Specifications

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Chapter 26 Configuring Network Security with ACLs
Configuring IP ACLs
Consider these guidelines and limitations before configuring named ACLs:
• Not all commands that accept a numbered ACL accept a named ACL. ACLs for packet filters and
route filters on interfaces can use a name. VLAN maps also accept a name.
• A standard ACL and an extended ACL cannot have the same name.
• Numbered ACLs are also available, as described in the “Creating Standard and Extended IP ACLs”
section on page 26-6.
• You can use standard and extended ACLs (named or numbered) in VLAN maps.
Beginning in privileged EXEC mode, follow these steps to create a standard ACL using names:
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:
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
ip access-list standard name Define a standard IP access list using a name, and enter access-list
configuration mode.
Note The name can be a number from 1 to 99.
Step 3
deny {source [source-wildcard] | host source |
any}
or
permit {source [source-wildcard] | host source
| any}
In access-list configuration mode, specify one or more conditions
denied or permitted to determine 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
Step 1
configure terminal Enter global configuration mode.
Step 2
ip access-list extended name Define an extended IP access list using a name and enter
access-list configuration mode.
Note 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] [time-range
time-range-name]
In access-list configuration mode, specify the conditions allowed
or denied.
See the “Creating a Numbered Extended ACL” section on
page 26-8 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.