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4-118
permit, deny (Standard ACL)
This command adds a rule to a Standard IP ACL. The rule sets a filter
condition for packets emanating from the specified source. Use the no form
to remove a rule.
Syntax
[no] {permit | deny} {any | source bitmask | host source}
• any – Any source IP address.
• source – Source IP address.
• bitmask – Decimal number representing the address bits to match.
• host – Keyword followed by a specific IP address.
Default Setting
None
Command Mode
Standard ACL
Command Usage
• New rules are appended to the end of the list.
• Address bitmasks are similar to a subnet mask, containing four integers
from 0 to 255, each separated by a period. The binary mask uses 1 bits
to indicate “match” and 0 bits to indicate “ignore.” The bitmask is
bitwise ANDed with the specified source IP address, and then compared
with the address for each IP packet entering the port(s) to which this
ACL has been assigned.
Example
This example configures one permit rule for the specific address 10.1.1.21
and another rule for the address range 168.92.16.x – 168.92.31.x using a
bitmask.
Related Commands
access-list ip (4-117)
Console(config-std-acl)#permit host 10.1.1.21
Console(config-std-acl)#permit 168.92.16.0 255.255.240.0
Console(config-std-acl)#