Command Line Reference Guide
212 | Access Control Lists (ACL)
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Most ACL rules require one entry in the CAM. However, rules with TCP and UDP port operators (gt,
lt, range) may require more than one entry. The range of ports is configured in the CAM based on bit
mask boundaries; the space required depends on exactly what ports are included in the range.
For example, an ACL rule with TCP port range 4000 - 8000 will use 8 entries in the CAM:
Rule# Data Mask From To #Covered
1 0000111110100000 1111111111100000 4000 4031 32
2 0000111111000000 1111111111000000 4032 4095 64
3 0001000000000000 1111100000000000 4096 6143 2048
4 0001100000000000 1111110000000000 6144 7167 1024
5 0001110000000000 1111111000000000 7168 7679 512
6 0001111000000000 1111111100000000 7680 7935 256
7 0001111100000000 1111111111000000 7936 7999 64
8 0001111101000000 1111111111111111 8000 8000 1
Total Ports: 4001
But an ACL rule with TCP port lt 1023 takes only one entry in the CAM:
Rule# Data Mask From To #Covered
1 0000000000000000 1111110000000000 0 1023 1024
Total Ports: 1024
Related
Commands
ip access-list extended
c e s
Name (or select) an extended IP access list (IP ACL) based on IP addresses or protocols.
Syntax
ip access-list extended access-list-name
To delete an access list, use the no ip access-list extended access-list-name command.
Parameters
Defaults
All access lists contain an implicit “deny any”; that is, if no match occurs, the packet is dropped.
Command Modes
CONFIGURATION
Command
History
Usage
Information
The number of entries allowed per ACL is hardware-dependent. Refer to your line card documentation
for detailed specification on entries allowed per ACL.
deny Assign a deny filter for IP traffic.
deny tcp Assign a deny filter for TCP traffic.
access-list-name
Enter a string up to 140 characters long as the access list name.
Version 8.1.1.0 Introduced on E-Series ExaScale
Version 7.8.1.0 Increased name string to accept up to 140 characters. Prior to 7.8.1.0, names are up to
16 characters long.
Version 7.6.1.0 Support added for S-Series
Version 7.5.1.0 Support added for C-Series
pre-Version 6.2.1.1 Introduced on E-Series