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Access Control List Commands
4-89
4
IP ACLs
access-list ip
This command adds an IP access list and enters configuration mode for standard or
extended IP ACLs. Use the no form to remove the specified ACL.
Syntax
[no] access-list ip {standard | extended} acl_name
• standard – Specifies an ACL that filters packets based on the source IP
address.
• extended – Specifies an ACL that filters packets based on the source or
destination IP address, and other more specific criteria.
• acl_name – Name of the ACL. (Maximum length: 16 characters)
Default Setting
None
Command Mode
Global Configuration
Command Usage
• An egress ACL must contain all deny rules.
• When you create a new ACL or enter configuration mode for an existing ACL,
use the permit or deny command to add new rules to the bottom of the list.
To create an ACL, you must add at least one rule to the list.
• To remove a rule, use the no permit or no deny command followed by the
exact text of a previously configured rule.
• An ACL can contain up to 32 rules.
Table 4-34 IP ACL Commands
Command Function Mode Page
access-list ip Creates an IP ACL and enters configuration mode for
standard or extended IP ACLs
GC 4-89
permit, deny Filters packets matching a specified source IP address STD-ACL 4-90
permit, deny Filters packets meeting the specified criteria, including
source and destination IP address, TCP/UDP port number,
protocol type, and TCP control code
EXT-ACL 4-91
show ip access-list Displays the rules for configured IP ACLs PE 4-93
access-list ip
mask-precedence
Changes to the IP Mask mode used to configure access
control masks
GC 4-93
mask Sets a precedence mask for the ACL rules IP-Mask 4-94
show access-list ip
mask-precedence
Shows the ingress or egress rule masks for IP ACLs PE 4-97
ip access-group Adds a port to an IP ACL IC 4-98
show ip access-group Shows port assignments for IP ACLs PE 4-98