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Configuring ACL ACL Configuration
User Guide 827
Step 4 access-list packet-content config
acl-id-or-name
rule { auto |
rule-id
} {deny | permit}
logging { enable | disable } [chunk0
value
mask0
mask
] [chunk1
value
mask1
mask
]
[chunk2
value
mask2
mask
] [chunk3
value
mask3
mask
] [tseg
time-range-name
]
Add rules to the ACL.
acl-id-or-name
: Enter the ID or name of the ACL that you want to add a rule for.
auto
:
The rule ID will be assigned automatically and the interval between rule IDs is 5.
rule-id
: Assign an ID to the rule.
deny | permit: Specify the action to be taken with the packets that match the rule. Deny
means to discard; permit means to forward. By default, it is set to permit.
logging { enable | disable} : Enable or disable Logging function for the ACL rule. If
"enable" is selected, the times that the rule is matched will be logged every 5 minutes.
With ACL Counter trap enabled, a related trap will be generated if the matching times
changes.
value
: Enter the 4-byte value in hexadecimal for the desired chunk, like ‘0000ffff’. The
Packet Content ACL will check this chunk of packets to examine if the packets match
the rule or not.
mask:
Enter the 4-byte mask in hexadecimal for the desired chunk. The mask must be
written completely in 4-byte hex mode, like ‘0000ffff’. The mask specifies which bits to
match the rule.
time-range-name
: The name of the time-range. The default is No Limit.
Step 5 end
Return to privileged EXEC mode.
Step 6 copy running-config startup-config
Save the settings in the configuration file.
The following example shows how to create Packet Content ACL 2000, and deny the
packets with the value of its chunk1 0x58:
Switch#configure
Switch(config)#access-list create 2000
Switch(config)#access-list packet-content profile chunk-offset0
offset0
chunk-offset1
offset1
chunk-offset2 offset2
chunk-offset3
offset3
Switch(config)#packet-content config 2000 rule 10 deny logging disable chunk1 58
mask1 ffffffff
Switch(config)#show access-list 2000
Packet content access list 2000 name: ACL_2000
rule 10 deny logging disable chunk1 value 0x58 mask 0xffffffff
Switch(config)#end
Switch#copy running-config startup-config
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