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Table Of Contents
Commented IP Access List Entries
Supported Standards, MIBs, and RFCs
Write Comments in a Named Access List
Write Comments in a Numbered Access List
Commented IP Access List Entries
Feature Overview
You can now include comments (remarks) about entries in any IP access list. The remarks make the access list easier for the network administrator to understand. Each remark is limited to 100 characters.
Benefits
User-Friendly
Remarks about entries in an IP access list make the list easier to understand and scan. For example, it is not immediately clear what the purpose of the following entry is:
access-list 1 permit 171.69.2.88It is much easier to read a remark about the entry to understand its effect, as follows:
access-list 1 remark Permit only Jones workstation throughaccess-list 1 permit 171.69.2.88Related Documents
For complete information on how to configure IP access lists, refer to the following:
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"Configuring IP Services" chapter in the Cisco IOS Release 12.0 Network Protocols Configuration Guide, Part 1.
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Supported Platforms
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Supported Standards, MIBs, and RFCs
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Configuration Tasks
The remark can go before or after a permit or deny statement. You should be consistent about where you put the remark so it is clear which remark describes which permit or deny statement. For example, it would be confusing to have some remarks before the associated permit or deny statements and some remarks after the associated statements.
Remember to apply the access list to an interface or terminal line after the access list is created. Refer to the related documentation for information on how to apply the access list.
To include remarks in an access list, perform one of the following tasks, depending on whether you are using a named or numbered access list:
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Write Comments in a Named Access List
To write a comment about an entry in a named IP access list, use the following commands in the order shown. Step 1 is performed once; Step 2 can be performed multiple times in the access list, before or after any permit or deny command.
Write Comments in a Numbered Access List
To write a comment about an entry in a numbered IP access list, use the following command before or after any access-list permit or access-list deny command:
Router(config)# access-list access-list-number remark remark
Indicates the purpose of the permit or deny statement.
Configuration Examples
In the following example of a numbered access list, the workstation belonging to Jones is allowed access and the workstation belonging to Smith is not allowed access:
access-list 1 remark Permit only Jones workstation throughaccess-list 1 permit 171.69.2.88access-list 1 remark Do not allow Smith workstation throughaccess-list 1 deny 171.69.3.13In the following example of a numbered access list, the Winter and Smith workstations are not allowed to browse the web:
access-list 100 remark Do not allow Winter to browse the webaccess-list 100 deny host 171.69.3.85 any eq httpaccess-list 100 remark Do not allow Smith to browse the webaccess-list 100 deny host 171.69.3.13 any eq httpIn the following example of a named access list, the Jones subnet is not allowed access:
ip access-list standard preventionremark Do not allow Jones subnet throughdeny 171.69.0.0 0.0.255.255In the following example of a named access list, the Jones subnet is not allowed to use outbound Telnet:
ip access-list extended telnettingremark Do not allow Jones subnet to telnet outdeny tcp host 171.69.2.88 any eq telnetCommand Reference
This section documents new commands. All other commands used with this feature are documented in the Cisco IOS Release 12.0 command references.
access-list remark
To write a helpful comment (remark) for an entry in a numbered IP access list, use the access-list remark global configuration command. To remove the remark, use the no form of this command.
access-list access-list-number remark remark
no access-list access-list-number remark remarkSyntax Description
access-list-number
Number of an IP access list.
remark
Comment that describes the access list entry, up to 100 characters long.
Default
The access list entries have no remarks.
Command Mode
Global configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 12.0(2)T.
The remark can be up to 100 characters; anything longer is truncated.
If you want to write a comment about an entry in a named access list, use the remark command.
Examples
In the following example, the workstation belonging to Jones is allowed access and the workstation belonging to Smith is not allowed access:
access-list 1 remark Permit only Jones workstation throughaccess-list 1 permit 171.69.2.88access-list 1 remark Do not allow Smith workstation throughaccess-list 1 deny 171.69.3.13Related Commands
access-list (extended)
access-list (standard)
remarkremark
To write a helpful comment (remark) for an entry in a named IP access list, use the remark access-list configuration command. To remove the remark, use the no form of this command.
remark remark
no remark remarkSyntax Description
Default
The access list entries have no remarks.
Command Mode
Access-list configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 12.0(2)T.
The remark can be up to 100 characters; anything longer is truncated.
If you want to write a comment about an entry in a numbered IP access list, use the access-list remark command.
Examples
In the following example, the Jones subnet is not allowed to use outbound Telnet:
ip access-list extended telnettingremark Do not allow Jones subnet to telnet outdeny tcp host 171.69.2.88 any eq telnetRelated Commands
access-list remark
deny
ip access-list
permit