Chapter 14. Access Lists and Regular Expressions

This chapter presents background and configuration information about access lists:

• 14-1: IP Access Lists

• 14-2: MAC Address and Protocal Type Code Access Lists

• 14-3: IPX Access Lists

• 14-4: AppleTalk Access Lists

• 14-5: Regular Expressions

Cisco IOS Software uses access lists for many functions. The functions are described throughout this book. This chapter describes the configuration steps needed to create the access lists you might need to use.

Access lists can be created and referenced by number and sometimes by name . Access lists fall into several categories, depending on what type of traffic or protocol is being matched or filtered. Table 14-1 summarizes how the access list numbers correspond to the access list functions.

Table 14-1 Access List Numbers and Functions

Table 14-1. Access List Numbers and Functions

Access List Type	Access List Numbers	Named Access Lists?
IP standard	1 to 99	Yes
	1300 to 1999
IP extended	100 to 199	Yes
	2000 to 2699
MAC address	700 to 799
MAC address extended	1100 to 1199
Protocol type code	200 to 299
IPX standard	800 to 899	Yes
IPX extended	900 to 999	Yes
IPX SAP	1000 to 1099	Yes
IPX summary address	1200 to 1299	Yes
AppleTalk	600 to 699
DECnet	300 to 399
XNS standard	400 to 499
XNS extended	500 to 599

Regular expressions are used to define a template that can be used to match against text strings. Regular expressions can be useful when you are matching patterns in modem chat scripts, BGP access lists, command output searching, and so forth.