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Configuration Guide - Security

S7700 and S9700 V200R011C10

This document describes the configurations of Security, including ACL, reflective ACL, local attack defense, MFF, attack defense, traffic suppression and storm control, ARP security, port security, DHCP snooping, ND snooping, PPPoE+, IPSG, SAVI, URPF, keychain, separating the management plane from the service plane, security risks.
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Example for Using User-Defined ACLs to Filter the Specified Packets

Example for Using User-Defined ACLs to Filter the Specified Packets

Networking Requirements

As shown in Figure 1-21, users are connected to the Switch through GE1/0/1. The Switch needs to discard certain packets sent by users (four bytes behind the 13th byte in the packet match 0x0180C200).

Figure 1-21  Using user-defined ACLs to filter the specified packets

Configuration Roadmap

The following configurations are performed on the Switch. The configuration roadmap is as follows:

  1. Configure a user-defined ACL and an ACL-based traffic classifier to filter certain packets (four bytes behind the 13th byte in the packet match 0x0180C200).
  2. Configure a traffic behavior to discard the packets matching the ACL.
  3. Configure and apply a traffic policy to make the ACL and traffic behavior take effect.

Procedure

  1. Configure an ACL.

    # Configure a user-defined ACL.

    <HUAWEI> system-view
    [HUAWEI] sysname Switch
    [Switch] acl 5000
    [Switch-acl-user-5000] rule deny l2-head 0x0180C200 0xFFFFFFFF 14
    [Switch-acl-user-5000] quit

  2. Creating a traffic classifier based on the user-defined ACL.

    # Configure the traffic classifier tc1 to classify packets that match ACL 5000.

    [Switch] traffic classifier tc1
    [Switch-classifier-tc1] if-match acl 5000
    [Switch-classifier-tc1] quit

  3. Configure a traffic behavior.

    # Configure the traffic behavior tb1 to reject packets.

    [Switch] traffic behavior tb1
    [Switch-behavior-tb1] deny
    [Switch-behavior-tb1] quit

  4. Configure a traffic policy.

    # Define the traffic policy and associate the traffic classifier and traffic behavior with the traffic policy.

    [Switch] traffic policy tp1
    [Switch-trafficpolicy-tp1] classifier tc1 behavior tb1
    [Switch-trafficpolicy-tp1] quit

  5. Apply the traffic policy to an interface.

    # Apply the traffic policy to the inbound direction of GE1/0/1.

    [Switch] interface gigabitethernet 1/0/1
    [Switch-GigabitEthernet1/0/1] traffic-policy tp1 inbound
    [Switch-GigabitEthernet1/0/1] quit

  6. Verify the configuration.

    # Check the configuration of the ACL rule.

    [Switch] display acl 5000
    User ACL 5000, 1 rule
    Acl's step is 5
     rule 5 deny 0x0180c200 0xffffffff 14

    # Check the configuration of the traffic classifier.

    [Switch] display traffic classifier user-defined
      User Defined Classifier Information:
       Classifier: tc1
        Precedence: 5
        Operator: OR
        Rule(s) : if-match acl 5000
    
    Total classifier number is 1   

    # Check the configuration of the traffic policy.

    [Switch] display traffic policy user-defined tp1
      User Defined Traffic Policy Information:                                      
      Policy: tp1                                                                   
       Classifier: tc1                                                              
        Operator: OR                                                                
         Behavior: tb1                                                              
          Deny  

Configuration Files

Switch configuration file

#
sysname Switch
#
acl number 5000
 rule 5 deny 0x0180c200 0xffffffff 14 
#
traffic classifier tc1 operator or precedence 5
 if-match acl 5000 
#
traffic behavior tb1
 deny
#
traffic policy tp1 match-order config
 classifier tc1 behavior tb1
#
interface GigabitEthernet1/0/1
 traffic-policy tp1 inbound
#
return 
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Updated: 2019-04-01

Document ID: EDOC1000178319

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