Cisco 2950 Software Configuration Guide - Page 546
Step 1, Use UDP port names only for UDP traffic.
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Configuring ACLs Chapter 29 Configuring Network Security with ACLs Beginning in privileged EXEC mode, follow these steps to create an extended ACL: Step 1 Step 2 Step 3 Step 4 Command Purpose configure terminal Enter global configuration mode. access-list access-list-number {deny | permit | remark} protocol {source source-wildcard | host source | any} [operator port] {destination destination-wildcard | host destination | any} [operator port] [dscp dscp-value] [time-range time-range-name] Define an extended IP access list and the access conditions. The access-list-number is a decimal number from 100 to 199 or 2000 to 2699. Enter deny or permit to specify whether to deny or permit the packet if conditions are matched. For protocol, enter the name or number of an IP protocol: IP, TCP, or UDP. To match any Internet protocol (including TCP and UDP), use the keyword ip. The source is the number of the network or host from which the packet is sent. The source-wildcard applies wildcard bits to the source. The destination is the network or host number to which the packet is sent. Define a destination or source port. • The operator can be only eq (equal). • If operator is after source source-wildcard, conditions match when the source port matches the defined port. • If operator is after destination destination-wildcard, conditions match when the destination port matches the defined port. • The port is a decimal number or name of a TCP or UDP port. The number can be from 0 to 65535. • Use TCP port names only for TCP traffic. • Use UDP port names only for UDP traffic. The destination-wildcard applies wildcard bits to the destination. Source, source-wildcard, destination, and destination-wildcard can be specified in three ways: • 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 or any source host. • The keyword host, followed by the 32-bit quantity in dotted-decimal format, as an abbreviation for a single host with source and source-wildcard of source 0.0.0.0. dscp-Enter to match packets with any of the supported 13 DSCP values (0, 8, 10, 16, 18, 24, 26, 32, 34, 40, 46, 48, and 56), or use the question mark (?) to see a list of available values. The time-range keyword is optional. For an explanation of this keyword, see the "Applying Time Ranges to ACLs" section on page 29-15. show access-lists [number | name] Verify the access list configuration. copy running-config startup-config (Optional) Save your entries in the configuration file. 29-12 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 78-11380-10
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