Reference Guide

230 | Access Control Lists (ACL)
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For example, an ACL rule with TCP port range 4000 - 8000 uses 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
resequence access-list
c e s
Re-assign sequence numbers to entries of an existing access-list.
Syntax
resequence access-list {ipv4 | mac} {access-list-name StartingSeqNum
Step-to-Increment
}
Parameters
Defaults
No default values or behavior
Command Modes
EXEC
EXEC Privilege
ip access-list extended Configure an extended ACL.
permit Assign a permit filter for IP packets.
permit tcp Assign a permit filter for TCP packets.
ipv4 | mac Enter the keyword ipv4 or mac to identify the access list type to
resequence.
access-list-name Enter the name of a configured IP access list, up to 140 characters.
StartingSeqNum
Enter the starting sequence number to resequence.
Range: 0 - 4294967290
Step-to-Increment
Enter the step to increment the sequence number.
Range: 1 - 4294967290