3com 5500-ei pwr Instrução De Instalação
1-7
Configuring Advanced ACL
An advanced ACL can filter packets by their source and destination IP addresses, the
protocols carried by IP, and protocol-specific features such as TCP/UDP source and
destination ports, ICMP message type and message code.
An advanced ACL can be numbered from 3000 to 3999. Note that ACL 3998 and ACL 3999
cannot be configured because they are reserved for cluster management.
Advanced ACLs support analysis and processing of three packet priority levels: type of
service (ToS) priority, IP priority and differentiated services codepoint (DSCP).
Using advanced ACLs, you can define classification rules that are more accurate, more
abundant, and more flexible than those defined for basic ACLs.
Configuration prerequisites
z
To configure a time range-based advanced ACL rule, you need to create the
corresponding time ranges first. For information about of time range configuration,
refer to
.
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The settings to be specified in the rule, such as source and destination IP addresses,
the protocols carried by IP, and protocol-specific features, are determined.
Configuration procedure
Follow these steps to define an advanced ACL rule:
To do...
Use the command...
Remarks
Enter system view
system-view
—
Create an advanced ACL
and enter advanced ACL
view
and enter advanced ACL
view
acl number acl-number
[ match-order { auto |
config } ]
[ match-order { auto |
config } ]
Required
config by default
Define an ACL rule
rule [ rule-id ] { permit |
deny } protocol
[ rule-string ]
deny } protocol
[ rule-string ]
Required
For information about
protocol and rule-string,
refer to ACL Commands.
protocol and rule-string,
refer to ACL Commands.
Assign a description string
to the ACL rule
to the ACL rule
rule rule-id comment text
Optional
No description by default
Assign a description string
to the ACL
to the ACL
description text
Optional
No description by default
Note that:
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With the config match order specified for the advanced ACL, you can modify any
existent rule. The unmodified part of the rule remains. With the auto match order
specified for the ACL, you cannot modify any existent rule; otherwise the system
prompts error information.
z
If you do not specify the rule-id argument when creating an ACL rule, the rule will be
numbered automatically. If the ACL has no rules, the rule is numbered 0; otherwise, the