Reference Guide

Version 7.4.1.0 Introduced on the E-Series TeraScale. Added the monitor
option.
Usage
Information
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 bitmask boundaries; the space required
depends on exactly what ports are included in the range.
Example
An ACL rule with a TCP port range 4000 - 8000 uses eight 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
Example
An ACL rule with a 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
permit – assigns a permit filter for IP packets.
permit tcp – assigns a permit filter for TCP packets.
remark
Enter a description for an IPv6 ACL entry.
C-Series, E-Series, S-Series
Syntax
remark remark number [description]
To delete the description, use the no remark remark number command (it is
not necessary to include the remark description that you are deleting).
Parameters
remark number Enter the remark number. The range is 0 to 4294967290.
NOTE: You can use the same sequence number for the
remark and an ACL rule.
1018
IPv6 Access Control Lists (IPv6 ACLs)