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Cisco MWR 1941-DC Mobile Wireless Edge Router Software Configuration Guide
OL-11503-01
Chapter 6 Configuring the MWR 1941-DC in a Cell Site DCN
Filtering IP Packets Using Access Lists
Note
When creating an access list, remember that, by default, the end of the access list contains an implicit
deny statement for everything if it did not find a match before reaching the end.
Note
In a standard access list, if you omit the mask from an associated IP host address access list
specification, 0.0.0.0 is assumed to be the mask.
Note
Autonomous switching is not used when you have extended access lists.
After creating an access list, you must apply it to a line or interface, as shown in the
“Applying Access
Lists” section on page 6-58
. See the
“Implicit Masks in Access Lists Examples” section on page 6-61
for examples of implicit masks.
Creating Standard and Extended Access Lists Using Names
You can identify IP access lists with an alphanumeric string (a name) rather than a number. Named
access lists allow you to configure more IP access lists in a router than if you were to use numbered
access lists. If you identify your access list with a name rather than a number, the mode and command
syntax are slightly different. Currently, only packet and route filters can use a named list.
Consider the following guidelines before configuring named access lists:
•
Access lists specified by name are not compatible with Cisco IOS Releases prior to 11.2.
•
Not all access lists that accept a number will accept a name. Access lists for packet filters and route
filters on interfaces can use a name.
•
A standard access list and an extended access list cannot have the same name.
•
Numbered access lists are also available, as described in the
“Creating Standard and Extended
Access Lists Using Numbers” section on page 6-46
.
Note
Named access lists will not be recognized by any software release prior to Cisco IOS Release 11.2.
Summary of Contents for MWR 1941-DC - 1941 Mobile Wireless Router
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