H3C S5500-SI Series Operation Manual

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Operation Manual – ACL H3C S5500-SI Series Ethernet Switches Table of Contents

Table of Contents

Chapter 1 ACL Overview ..............................................................................................................1-1

1.1 ACL Overview....................................................................................................................1-1

1.2 Time-Based ACL................................................................................................................1-1

1.3 IPv4 ACL............................................................................................................................1-1

1.3.1 IPv4 ACL Classification...........................................................................................1-2

1.3.2 IPv4 ACL Match Order............................................................................................ 1-2

1.3.3 IP Fragments Filtering with IPv4 ACL..................................................................... 1-3

1.3.4 IPv4 ACL Creation .................................................................................................. 1-3

1.4 IPv6 ACL............................................................................................................................1-4

1.4.1 IPv6 ACL Classification...........................................................................................1-4

1.4.2 IPv6 ACL Match Order............................................................................................ 1-4

1.4.3 IPv6 ACL Creation .................................................................................................. 1-4

Chapter 2 IPv4 ACL Configuration ..............................................................................................2-1

2.1 Creating a Time Range...................................................................................................... 2-1

2.1.1 Configuration Procedure......................................................................................... 2-1

2.1.2 Configuration Example............................................................................................2-2

2.2 Configuring a Basic IPv4 ACL...........................................................................................2-3

2.2.1 Configuration Prerequisites..................................................................................... 2-3

2.2.2 Configuration Procedure......................................................................................... 2-3

2.2.3 Configuration Example............................................................................................2-4

2.3 Configuring an Advanced IPv4 ACL.................................................................................. 2-4

2.3.1 Configuration Prerequisites..................................................................................... 2-5

2.3.2 Configuration Procedure......................................................................................... 2-5

2.3.3 Configuration Example............................................................................................2-6

2.4 Configuring an Ethernet Frame Header ACL ....................................................................2-6

2.4.1 Configuration Prerequisites..................................................................................... 2-6

2.4.2 Configuration Procedure......................................................................................... 2-6

2.4.3 Configuration Example............................................................................................2-7

2.5 Displaying and Maintaining IPv4 ACLs.............................................................................. 2-8

2.6 IPv4 ACL Configuration Example...................................................................................... 2-8

2.6.1 Network Requirements............................................................................................2-8

2.6.2 Network Diagram.....................................................................................................2-8

2.6.3 Configuration Procedure......................................................................................... 2-9

Chapter 3 IPv6 ACL Configuration ..............................................................................................3-1

3.1 Configuring a Time Range.................................................................................................3-1

3.2 Configuring a Basic IPv6 ACL...........................................................................................3-1

3.2.1 Configuration Prerequisites..................................................................................... 3-1

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3.2.2 Configuration Procedure......................................................................................... 3-1

3.2.3 Configuration Example............................................................................................3-2

3.3 Configuring an Advanced IPv6 ACL.................................................................................. 3-3

3.3.1 Configuration Prerequisites..................................................................................... 3-3

3.3.2 Configuration Procedure......................................................................................... 3-3

3.3.3 Configuration Example............................................................................................3-4

3.4 Displaying and Maintaining IPv6 ACLs.............................................................................. 3-4

3.5 IPv6 ACL Configuration Example...................................................................................... 3-5

3.5.1 Network Requirements............................................................................................3-5

3.5.2 Configuration Procedure......................................................................................... 3-5

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Chapter 1 ACL Overview

1.1 ACL Overview

An access control list (ACL) is used primarily to identify traffic flows. In order to filter data packets, a series of match rules must be configured on the network device to identify the packets to be filtered. After the specific p ackets are identified, and based on the predefined policy , the network device can permit/prohibit the correspondi ng packets to pass.

ACLs classify packets based on a se ries of match conditions, whi ch can be the source addresses, destination addresses and port numbers carried in the packets.

The packet match rules defined by ACLs can be referenced by other functions that need to differentiate traffic flows, such as the definition of traffic classification rules in QoS.

ACL Overview

 Note:

In this manual, IPv4 ACL refers to ACL used for filtering IPv4 packets, and IPv6 ACL refers to ACL used for filtering IPv6 packets.

1.2 Time-Based ACL

A time range-based ACL enables you to implement ACL control over packets by differentiating the time ranges.

A time range can be specifi ed in each rule in an ACL. If the time range specified in a rule is not configured, the system will give a prompt message and allow such a rule to be successfully created. However, the rule does not take ef fect immediately. It takes ef fect only when the specified time range is configured and the system time is within the time range. If you remove the time range of an ACL rule, the ACL rule becomes invalid the next time the ACL rule timer refreshes.

1.3 IPv4 ACL

This section covers these topics:

z IPv4 ACL Classification z IPv4 ACL Match Order z IP Fragments Filtering with IPv4 ACL

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1.3.1 IPv4 ACL Classification

IPv4 ACLs, identified by ACL numbers, fall into the following four categories:

z Basic IPv4 ACL, based on source IP address. Basic ACLs are numbered 2000

through 2999.

z Advanced IPv4 ACL, based on source IP address, destination IP address,

protocol carried on IP, and other Layer 3 or Layer 4 protocol header information. Advanced ACLs are numbered 3000 through 3999.

z Ethernet frame header ACL, based on Layer 2 protocol header fields such as

source MAC address, destination MAC address, 802.1p priority, and link layer protocol type. Ethernet frame header ACLs are numbered 4000 through 4999.

1.3.2 IPv4 ACL Match Order

Each ACL is a sequential collectio n of rules defined with diff erent matching criteria. The order in which a packet is matched against the rules may thus affect how the packet is handled.

ACL Overview

At present, the following two match orders are available:

z config: where rules are compared against in the order in which they are

configured.

z auto: where depth-first match is performed.

I. Depth-first match for a basic IPv4 ACL

The following shows how your device performs depth-first match in a basic IPv4 ACL:

1) Sort rules by source IP address wildcard first and compare packets against the rule configured with more zeros in the source IP address wildcard prior to other rules.

2) If two rules are present with the same number of zeros in their source IP address wildcards, compare packets against the rule configured first prior to the others.

For example, the rule with the source IP address wildcard 0.0.0.255 is compared prior to the rule with the source IP address wildcard 0.0.255. 255.

II. Depth-first match for an advanced IPv4 ACL

The following shows how your device performs depth-first match in an advanced IPv4 ACL:

1) Sort rules by source IP address wildcard first and compare packets against the rule configured with more zeros in the source IP address wildcard prior to other rules.

2) If two rules are present with the same number of zeros in their source IP address wildcards, look at the destination IP address wildcards in the rules in addition. Then, compare packets against the rule configured with more zeros in the destination IP address wildcard prior to the other.

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3) If the numbers of zeros in the destination IP address wildcards are the same, compare packets against the rule configured first prior to the other.

For example, the rule with the source IP address wildcard 0.0.0.255 is compared prior to the rule with the source IP address wildcard 0.0.255. 255.

III. Depth-first match for an Ethernet frame header IPv4 ACL

The following shows how your device performs depth-first match in an Ethernet frame header ACL:

1) Sort rules by source MAC address mask first and compare packets against the rule configured with more ones in the source MAC address mask prior to other rules.

2) If two rules are present with the same number of ones in their source MAC address masks, look at the destination MAC address masks. Then, compare packets against the rule configured with more ones in the destination MAC address mask prior to the other.

3) If the numbers of ones in the destination MAC address masks are the same, the one configured first is compared prior to the other.

ACL Overview

For example, the rule with source MAC address mask FFFF-FFFF-0000 is compared prior to the rule with source MAC address mask FFFF-0000-0000.

The comparison of a packet against an ACL stop s once a match is found. The p acket is then processed as per the rule.

1.3.3 IP Fragments Filtering with IPv4 ACL

Traditionally, ACL does not check all IP fragm ent s but first ones. All non-first fragments are handled the way the first fragments are handled. This causes security risk as attackers may fabricate non-first fragments to attack your network.

As for the configuration of a rule of an IPv4 ACL, the fragment keyword specifies that the rule applies to non-first fragment packet s only, and does not apply to non-fragment packets or the first fragment packets. ACL rules that do not contain this keyword is applicable to both non-fragment packets and fragment packets.

1.3.4 IPv4 ACL Creation

An IPv4 ACL consists of a set of rules. Before you can configure ACL rules, you must first create an IPv4 ACL.

When creating an IPv4 ACL:

z You must specify an ACL number (numeric type), and z You can optionally specify the match order of the IPv4 ACL.

After an IPv4 ACL is created, the IPv4 ACL view is di splayed.

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1.4 IPv6 ACL

This section covers these topics:

z IPv6 ACL Classification z IPv6 ACL Match Order

1.4.1 IPv6 ACL Classification

IPv6 ACLs, identified by ACL numbers, fall into the following three categories:

z Basic IPv6 ACL, based on source IPv6 address. Basic IPv6 ACLs are numbered

2000 through 2999.

z Advanced IPv6 ACL, based on source IPv6 address, destination IPv6 address,

protocol carried on IP, and other Layer 3 or Layer 4 protocol header fields. Advanced ACLs are numbered 3000 through 3999.

1.4.2 IPv6 ACL Match Order

ACL Overview

Similar to IPv4 ACLs, IPv6 ACLs are sequential collections of rules defined with different matching parameters. The order in which a packet is matched against the rules in an IPv6 ACL may affect how the packet is handled.

Like IPv4 ACLs, the following two match orders are available IPv6 ACLs:

z config: where rules are compared against in the order in which they are

configured.

z auto: where depth-first match is performed.

The depth-first mechanism performed by IPv6 ACLs is to match packets against the rule that specifies a narrower address range first. This is done by comparing prefix lengths: the smaller the prefix length, the narrower the address range.

Consider two IPv6 addresses, 2050:6070::/96 and 2050:6070::/64. In the auto match approach, packets are matched against the rule with the address of 2050:6070::/96 first, because that address specifies a narrower address range compared with 2050:6070::/64. In case two rules with the same prefix length are defined in an IPv6 ACL, the one configured first is compared prior to the other one.

The comparison of a packet against an ACL stop s once a match is found. The p acket is then processed as per the rule.

1.4.3 IPv6 ACL Creation

An IPv6 ACL consists of a set of rules. Before you can configure IPv6 ACL rules, you must first create an IPv6 ACL.

When creating an IPv6 ACL:

z You must specify an IPv6 ACL number (numeric type), and z You can optionally specify the match order of the IPv6 ACL.

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After an IPv6 ACL is created, the IPv6 ACL view is di splayed.

ACL Overview

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Chapter 2 IPv4 ACL Configuration

This chapter covers these topics:

z Creating a Time Range z Configuring a Basic IPv4 ACL z Configuring an Advanced IPv4 ACL z Configuring an Ethernet Frame Header ACL z Displaying and Maintaining IPv4 ACLs z IPv4 ACL Configuration Example

2.1 Creating a Time Range

Three types of time ranges are available:

z Periodic time range, which recurs periodically on the day or days of the week. z Absolute time range, which takes effect only in a period of time an d does not recur. z Compound time range, which recurs on the day or days of the week within a

period.

IPv4 ACL Configuration

Caution:

On the S5500-SI Series Ethernet Switches, the start time of an absolute time range cannot be earlier than 1970/1/1 00:00 and the end time of an absolute time range cannot be later than 2100/12/31 24:00.

2.1.1 Configuration Procedure

Follow these steps to create a time range:

To do… Use the command… Remarks

Enter system view

Create a time range

system-view time-range time-name { start-time

to end-time days [ from time1

date1 ] [ to time2 date2 ] | from time1 date1 [ to time2 date2 ] | to time2 date2 }

––

Required

Note that:

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z Periodic time range created using the time-range time-name start-time to

end-time days command. A time range thus created recu rs periodically on the day

or days of the week.

z Absolute time range created using the time-range time-name { from time1 date1

[ to time2 date2 ] | to time2 date2 } command. Unli ke a periodic time range, a time range thus created does not recur. For example, to create an absolute time range that is active between January 1, 2004 00:00 and December 31, 2004 23:59, you may use the time-range test from 00:00 01/01/2004 to 23:59 12/31/2004 command.

z Compound time range created using the time-range time-name start-time to

end-time days { from time1 date1 [ to tim e2 date2 ] | to time2 date2 } command. A

time range thus created recurs on the day or days of the week only within the specified period. For example, to create a time range that is active from 12:00 to 14:00 on Wednesdays between January 1, 2004 00:00 and December 31, 2004 23:59, you may use the time-range test 12:00 to 14:00 wednesday from 00:00 01/01/2004 to 23:59 12/31/2004 command.

z You may create individual time ranges identified with the same name. They are

regarded as one time range whose active period is the result of ORing periodic ones, ORing absolute ones, and ANDing periodic and absolute ones.

z If the start time is not specified, the time range starts on the earliest time available

from the system and ends on the end date. If the end date is note specified, the time range is from the date of configuration till the largest date available from the system.

z Up to 256 time ranges can be defined.

IPv4 ACL Configuration

2.1.2 Configuration Example

# Create a periodic time range that spans from 8:00 to 18:00 every working day.

<Sysname> system-view [Sysname] time-range test 8:00 to 18:00 working-day [Sysname] display time-range test Current time is 13:27:32 4/16/2005 Saturday

Time-range : test ( Inactive ) 08:00 to 18:00 working-day

# Create an absolute time range that spans from 15:00 2000/1/28 to 15:00 2004/1/28.

<Sysname> system-view [Sysname] time-range test from 15:00 2000/1/28 to 15:00 2004/1/28 [Sysname] display time-range test Current time is 13:27:32 4/16/2005 Saturday

Time-range : test ( Inactive )

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from 15:00 1/28/2000 to 15:00 1/28/2004

2.2 Configuring a Basic IPv4 ACL

Basic IPv4 ACLs filter packets based on source IP address. They are numbered in the range 2000 to 2999.

2.2.1 Configuration Prerequisites

If you want to reference a time range to a rule, define it with the time-range command first.

2.2.2 Configuration Procedure

Follow these steps to configure a basic IPv4 ACL:

To do… Use the command… Remarks

IPv4 ACL Configuration

Enter system view

Create and enter a basic IPv4 ACL view

Create or modify a rule

Set a rule numbering step

Create an ACL description

Create a rule description

system-view

acl number acl-number [ match-order { config | auto } ]

rule [ rule-id ] { permit | deny }

[ rule-string ]

step step-value

description text

rule rule-id comment text

–– Required

The default match order is config.

Required To create multiple

rules, repeat this step. Optional

The default step is 5.

Optional

When configuring a rule, note that:

z You will fail to create or modify a rule if its permit/deny statement is exactly the

same as another rule. In addition, if the ACL match order is set to auto rather than config, you cannot modify ACL rules.

z When defining ACL rules, you are not necessarily to assign them I Ds. The syste m

can automatically assign rule IDs starting with 0 and increasing in certain rule numbering steps. A rule ID thus assigned is greater than the current highest rule ID. For example, if the rule numbering step is 5 and the current highest rule ID is 28, the next rule will be numbered 30.

z A newly defined rule cannot be identical with any existing rule, otherwise the rule

cannot be successfully created (the system will prompt the rule already exists)

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z Rules created with the auto keyword specified are sorted according to the “depth

first” principle regardless of the order they are created. However, the ID of each rule does not change.

Caution:

z You can modify the match order of an ACL with the acl number acl-number

match-order { auto | config } command but only when it does not contain any rules.

z You can use the rule comment command only for existing ACL rules.

2.2.3 Configuration Example

# Create IPv4 ACL 2000 to deny the packets with the source address 1.1.1.1 to pass.

<Sysname> system-view [Sysname] acl number 2000 [Sysname-acl-basic-2000] rule deny source 1.1.1.1 0

IPv4 ACL Configuration

# Verify the configuration.

[Sysname-acl-basic-2000] display acl 2000 Basic ACL 2000, 1 rule, ACL's step is 5 rule 0 deny source 1.1.1.1 0 (0 times matched)

2.3 Configuring an Advanced IPv4 ACL

Advanced IPv4 ACLs filter packets ba sed on source IP add ress, destination IP address, upper protocol carried on IP, and other protocol header fields, such as the TCP/UDP source port, TCP/UDP destination port, ICMP message type, and ICMP message code.

In addition, advanced ACLs allow you to filter packets based on three priority criteria: type of service (ToS), IP precedence, and differentiated services codepoint (DSCP) priority.

Advanced ACLs are numbered in the range 3000 to 3999. Compared to basic ACLs, they allow of more flexible and accurate filtering.

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 Note:

z When you configure both IP priority and ToS priority for a rule, both priorities are

valid.

z When you configure both IP/ToS priority and DSCP for a rule, only DSCP is valid.

2.3.1 Configuration Prerequisites

If you want to reference a time range to a rule, define it with the time-range command first.

2.3.2 Configuration Procedure

Follow these steps to configure an advanced IPv4 ACL:

To do… Use the command… Remarks

IPv4 ACL Configuration

Enter system view

Create and enter an advanced IPv4 ACL view

Create or modify a rule

Set a rule numbering step

Create an ACL description

Create a rule description

system-view acl number acl-number

[ match-order { config | auto } ]

rule [ rule-id ] { permit | deny } protocol

[ rule-string ]

step step-value

description text

rule rule-id comment text

–– Required

The default match order is config.

Required To create multiple rules,

repeat this step. Optional

The default step is 5.

Optional

When configuring a rule, note that:

z You will fail to create or modify a rule if its permit/deny statement is exactly the

same as another rule. In addition, if the ACL match order is set to auto rather than config, you cannot modify ACL rules.

z When defining ACL rules, you are not necessarily to assign them I Ds. The syste m

z A newly defined rule cannot be identical with any existing rule, otherwise the rule

cannot be successfully created (the system will prompt the rule already exists)

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z Rules created with the auto keyword specified are sorted according to the “depth

first” principle regardless of the order they are created. However, the ID of each rule does not change.

Caution:

z You can modify the match order of an ACL with the acl number acl-number

match-order { auto | config } command but only when it does not contain any rules.

z You can use the rule comment command only for existing ACL rules.

2.3.3 Configuration Example

# Create IPv4 ACL 3000 to permit TCP packets with port number 80 sent from

129.9.0.0 to 202.38.160.0.

IPv4 ACL Configuration

<Sysname> system-view [Sysname] acl number 3000 [Sysname-acl-adv-3000] rule permit tcp source 129.9.0.0 0.0.255.255 destination 202.38.160.0 0.0.0.255 destination-port eq 80

# Verify the configuration.

[Sysname-acl-adv-3000] display acl 3000 Advanced ACL 3000, 1 rule, ACL's step is 5 rule 0 permit tcp source 129.9.0.0 0.0.255.255 destination 202.38.160.0

0.0.0.255 destination-port eq www (0 times matched)

2.4 Configuring an Ethernet Frame Header ACL

Ethernet frame header ACLs filter packets based on Layer 2 protocol header fields such as source MAC address, destination MAC address, 802.1p priority, and link layer protocol type. They are numbered in the range 4000 to 4999.

2.4.1 Configuration Prerequisites

If you want to reference a time range to a rule, define it with the time-range command first.

2.4.2 Configuration Procedure

Follow these steps to configure an Ethernet frame header ACL:

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To do… Use the command… Remarks

IPv4 ACL Configuration

Enter system view Create and enter an

Ethernet frame header ACL view

Create or modify a rule

Set a rule numbering step

Create an ACL description

Create a rule description

system-view acl number acl-number

[ match-order { config | auto } ]

rule [ rule-id ] { permit | deny } [ rule-string ]

step step-value

description text

rule rule-id comment text

–– Required

The default match order is config.

Required To create multiple rules,

repeat this step. Optional

The default step is 5.

Optional

When configuring a rule, note that:

z You will fail to create or modify a rule if its permit/deny statement is exactly the

same as another rule. In addition, if the ACL match order is set to auto rather than config, you cannot modify ACL rules.

z When defining ACL rules, you are not necessarily to assign them I Ds. The syste m

z A newly defined rule cannot be identical with any existing rule, otherwise the rule

cannot be successfully created (the system will prompt the rule already exists)

z Rules created with the auto keyword specified are sorted according to the “depth

first” principle regardless of the order they are created. However, the ID of each rule does not change.

Caution:

z You can modify the match order of an ACL with the acl number acl-number

match-order { auto | config } command but only when it does not contain any rules.

z You can use the rule comment command only for existing ACL rules.

2.4.3 Configuration Example

# Create IPv4 ACL 4000 to deny frames with the 802.1p priority of 3.

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<Sysname> system-view [Sysname] acl number 4000 [Sysname-acl-ethernetframe-4000] rule deny cos 3

# Verify the configuration.

[Sysname-acl-ethernetframe-4000] display acl 4000 Ethernet frame ACL 4000, 1 rule, ACL's step is 5 rule 0 deny cos excellent-effort(0 times matched)

2.5 Displaying and Maintaining IPv4 ACLs

To do... Use the command… Remarks

Display information about a specified or all IPv4 ACLs

Display the configuration and state of a specified or all time ranges

display acl { all | acl-number }

display time-range { all |

time-name }

IPv4 ACL Configuration

Available in any view

Clear the statistics about the specified or all ACLs

reset acl counter { all | acl-number }

2.6 IPv4 ACL Configuration Example

2.6.1 Network Requirements

Different departments of an enterprise are interconnected on the intranet through the ports of a switch. The IP address of the wage query server is 192.168.1.2. Devices of the R&D department are connected to the GigabitEthernet1/0/1 port of the switch. Apply an ACL to deny request s sourced from the R& D departme nt and destined for the wage server during the working hours (8:00 to 18:00).

2.6.2 Network Diagram

To a router

Salary server

192.168.1.2

Available in user view

Switch

R&D Department

Figure 2-1 Network diagram for ACL configuratio

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2.6.3 Configuration Procedure

1) Create a time range for office hours

# Create a periodic time range spanning 8:00 to 18:00 in working days.

<Sysname> system-view [Sysname] time-range trname 8:00 to 18:00 working-day

2) Define an ACL to control accesses to the salary server

# Create and enter the view of advanced IPv4 ACL 3000.

[Sysname] acl number 3000

# Create a rule to control accesses of the R&D Department to the salary server.

[Sysname-acl-adv-3000] rule 0 deny ip source any destination 192.168.1.2

0.0.0.0 time-range trname

[Sysname-acl-adv-3000] quit

3) Apply the ACL

# Apply IPv4 ACL 3000 to the inbound direction of interface GigabitEthernet1/0/1.

IPv4 ACL Configuration

[Sysname] traffic classifier test [Sysname-classifier-test] if-match acl 3000 [Sysname-classifier-test] quit [Sysname] traffic behavior test [Sysname-behavior-test] filter deny [Sysname-behavior-test] quit [Sysname] qos policy test [Sysname-qospolicy-test] classifier test behavior test [Sysname-qospolicy-test] quit [Sysname] interface GigabitEthernet 1/0/1 [Sysname-GigabitEthernet1/0/1] qos apply policy test inbound

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Chapter 3 IPv6 ACL Configuration

This chapter covers these topics:

z Configuring a Time Range z Configuring a Basic IPv6 ACL z Configuring an Advanced IPv6 ACL z Displaying and Maintaining IPv6 ACLs z IPv6 ACL Configuration Example

3.1 Configuring a Time Range

Refer to section 2.1 “Creating a Time Range.”

3.2 Configuring a Basic IPv6 ACL

IPv6 ACL Configuration

Basic IPv6 ACLs filter packets based on source IPv6 address. They are numbered in the range 2000 to 2999.

3.2.1 Configuration Prerequisites

If you want to reference a time range to a rule, define it with the time-range command first.

3.2.2 Configuration Procedure

Follow these steps to configure an IPv6 ACL:

To do… Use the command… Remarks

Enter system view

Create and enter a basic IPv6 ACL view

Create a rule

system-view acl ipv6 number acl-number

[ match-order { config | auto } ]

rule [ rule-id ] { permit | deny } [ rule-string ]

–– Required

The default match order is config.

Required To create multiple

rules, repeat this step.

Set a rule numbering step

Create an ACL description

Create a rule description

step step-value

description text

rule rule-id comment text

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Optional The default step is 5.

Optional

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When configuring a rule, note that:

z You will fail to create or modify a rule if its permit/deny statement is exactly the

same as another rule. In addition, if the ACL match order is set to auto rather than config, you cannot modify ACL rules.

z When defining ACL rules, you are not necessarily to assign them I Ds. The syste m

z A newly defined rule cannot be identical with any existing rule, otherwise the rule

cannot be successfully created (the system will prompt the rule already exists)

z Rules created with the auto keyword specified are sorted according to the “depth

first” principle regardless of the order they are created. However, the ID of each rule does not change.

IPv6 ACL Configuration

Caution:

z You can modify the match order of an IPv6 ACL with the acl ipv6 number

acl6-number match-order { auto | config } command but only when it does not contain any rules.

z The rule specified in the rule comment command must have existed.

3.2.3 Configuration Example

# Create IPv6 ACL 2000 to permit IPv6 packets with source address 2030:5060::9050/64 to pass while denying IPv6 packets with source address fe80:5060::8050/96.

<Sysname> system-view [Sysname] acl ipv6 number 2000 [Sysname-acl6-basic-2000] rule permit source 2030:5060::9050/64 [Sysname-acl6-basic-2000] rule deny source fe80:5060::8050/96

# Verify the configuration.

[Sysname-acl6-basic-2000] display acl ipv6 2000 Basic IPv6 ACL 2000, 2 rules, ACL's step is 5 rule 0 permit source 2030:5060::9050/64 (0 times matched) rule 5 deny source FE80:5060::8050/96 (0 times matched)

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3.3 Configuring an Advanced IPv6 ACL

Advanced ACLs filter packets based on the source IPv6 address, destination IPv6 address, upper protocol carried on IP, and other protocol header fields such as the TCP/UDP source port, TCP/UDP destination port, ICMP message type, and ICMP message code.

Advanced IPv6 ACLs are numbered in the range 3000 to 3999. Compared to basic IPv6 ACLs, they allow of more flexible and accurate filtering.

3.3.1 Configuration Prerequisites

If you want to reference a time range to a rule, define it with the time-range command first.

3.3.2 Configuration Procedure

Follow these steps to configure an advanced IPv6 ACL:

IPv6 ACL Configuration

To do… Use the command… Remarks

Enter system view

Create and enter an advanced IPv6 ACL view

system-view acl ipv6 number acl-number

[ match-order { config | auto } ]

–– Required

The default match order is config.

Required

Create a rule

rule [ rule-id ] { permit | deny } protocol [ rule-string ]

To create multiple rules, repeat this step.

Optional

Set a rule numbering step

Create an ACL description

Create a rule description

step step-value

description text

rule rule-id comment text

The default step is

Optional

When configuring a rule, note that:

z You will fail to create or modify a rule if its permit/deny statement is exactly the

same as another rule. In addition, if the ACL match order is set to auto rather than config, you cannot modify ACL rules.

z When defining ACL rules, you are not necessarily to assign them I Ds. The syste m

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z A newly defined rule cannot be identical with any existing rule, otherwise the rule

cannot be successfully created (the system will prompt the rule already exists)

z Rules created with the auto keyword specified are sorted according to the “depth

first” principle regardless of the order they are created. However, the ID of each rule does not change.

Caution:

z You can modify the match order of an IPv6 ACL with the acl ipv6 number

acl6-number match-order { auto | config } command but only when it does not contain any rules.

z The rule specified in the rule comment command must have existed.

3.3.3 Configuration Example

IPv6 ACL Configuration

# Create IPv6 ACL 3000 to permit the TCP packets with the source address 2030:5060::9050/64 to pass.

<Sysname> system-view [Sysname] acl ipv6 number 3000 [Sysname-acl6-adv-3000] rule permit tcp source 2030:5060::9050/64

# Verify the configuration.

[Sysname-acl6-adv-3000] display acl ipv6 3000 Advanced IPv6 ACL 3000, 1 rule, ACL's step is 5 rule 0 permit tcp source 2030:5060::9050/64 (0 times matched)

3.4 Displaying and Maintaining IPv6 ACLs

To do… Use the command… Remarks

Display information about a specified or all IPv6 ACLs

Clear the statistics about a specified or all IPv6 ACLs

display acl ipv6 { all | acl-number }

reset acl ipv6 counter { all | acl-number }

Available in any view

Available in user view

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3.5 IPv6 ACL Configuration Example

3.5.1 Network Requirements

Configure packet filtering on interface GigabitEthernet1/0/2 to deny all IPv6 packets but those with source addresses in the range 4050::9000 to 4050::90FF.

3.5.2 Configuration Procedure

1) Configure ACL6

# Enter system view.

<Sysname> system-view

# Configure an ACL rule to permit packets from 4050::9000 to 4050::90FF.

[Sysname] acl ipv6 number 2000 [Sysname-acl6-basic-2000] rule permit source 4050::9000/120

# Configure an ACL rule to deny packets from other addresses.

IPv6 ACL Configuration

[Sysname] acl ipv6 number 2001 [Sysname-acl6-basic-2001] rule deny source any

2) Configure ACL rules on the inbound direction of the GigabitEthernet1/0/2 port.

# Configure class and traffic behaviors to permit packets from 4050::9000 to 4050::90FF.

[Sysname] traffic classifier c_permit [Sysname-classifier-c_permit] if-match acl ipv6 2000 [Sysname-classifier-c_permit] quit [Sysname] traffic behavior b_permit [Sysname-behavior-b_permit] filter permit [Sysname-behavior-b_permit] quit

# Configure class and traffic behaviors to deny packets from other addresses.

[Sysname] traffic classifier c_deny [Sysname-classifier-c_deny] if-match acl ipv6 2001 [Sysname-classifier-c_deny] quit [Sysname] traffic behavior b_deny [Sysname-behavior-b_deny] filter deny [Sysname-behavior-b_deny] quit

# Define a traffic policy and apply it.

[Sysname] qos policy test [Sysname-qospolicy-test] classifier c_permit behavior b_permit [Sysname-qospolicy-test] classifier c_deny behavior b_deny [Sysname-qospolicy-test] quit [Sysname] interface GigabitEthernet 1/0/2

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[Sysname-GigabitEthernet1/0/2] qos apply policy test inbound

IPv6 ACL Configuration

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