34-7
Cisco IE 3000 Switch Software Configuration Guide
OL-13018-03
Chapter 34 Configuring Network Security with ACLs
Configuring IPv4 ACLs
Creating a Numbered Standard ACL
Beginning in privileged EXEC mode, follow these steps to create a numbered standard ACL:
Use the
no access-list
access-list-number
global configuration command to delete the entire ACL. You
cannot delete individual ACEs from numbered access lists.
Note
When creating an ACL, remember that, by default, the end of the ACL contains an implicit
deny
statement for all packets that it did not find a match for before reaching the end. With standard access
lists, if you omit the mask from an associated IP host address ACL specification, 0.0.0.0 is assumed to
be the mask.
This example shows how to create a standard ACL to deny access to IP host 171.69.198.102, permit
access to any others, and display the results.
Switch (config)#
access-list 2 deny host 171.69.198.102
Switch (config)#
access-list 2 permit any
Switch(config)#
end
Switch#
show access-lists
Standard IP access list 2
10 deny 171.69.198.102
20 permit any
Command
Purpose
Step 1
configure terminal
Enter global configuration mode.
Step 2
access-list
access-list-number
{
deny
|
permit
}
source
[
source-wildcard
]
Define a standard IPv4 access list by using a source address and
wildcard.
The
access-list-number
is a decimal number from 1 to 99 or 1300
to 1999.
Enter
deny
or
permit
to specify whether to deny or permit access
if conditions are matched.
The
source
is the source address of the network or host from which
the packet is being sent specified as:
•
The 32-bit quantity in dotted-decimal format.
•
The keyword
any
as an abbreviation for
source
and
source-wildcard
of 0.0.0.0 255.255.255.255. You do not need
to enter a source-wildcard.
•
The keyword
host
as an abbreviation for source and
source-wildcard of
source
0.0.0.0.
(Optional) The
source-wildcard
applies wildcard bits to the
source.
Step 3
end
Return to privileged EXEC mode.
Step 4
show access-lists
[
number
|
name
]
Show the access list configuration.
Step 5
copy running-config startup-config
(Optional) Save your entries in the configuration file.
