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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 Layer 2 ACLs to Block Network Access of the Specified Users

Example for Using Layer 2 ACLs to Block Network Access of the Specified Users

Networking Requirements

As shown in Figure 1-19, the Switch that functions as the gateway is connected to the users' PCs. The administrator wants to block network access of PC1 after detecting that PC1 (00e0-f201-0101) is an unauthorized user.

Figure 1-19  Using Layer 2 ACLs to block network access of the specified users

Configuration Roadmap

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

  1. Configure a Layer 2 ACL and ACL-based traffic classifier to discard packets from MAC address 00e0-f201-0101 (preventing the user with this MAC address from accessing the network).
  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.


  1. Configure an ACL.

    # Configure a Layer 2 ACL to meet the preceding requirement.

    <HUAWEI> system-view
    [HUAWEI] sysname Switch
    [Switch] acl 4000
    [Switch-acl-L2-4000] rule deny source-mac 00e0-f201-0101 ffff-ffff-ffff
    [Switch-acl-L2-4000] quit

  2. Configure an ACL-based traffic classifier.

    # Configure the traffic classifier tc1 to classify packets that match ACL 4000.

    [Switch] traffic classifier tc1
    [Switch-classifier-tc1] if-match acl 4000
    [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.

    # Configure the traffic policy tp1 and associate tc1 and tb1 with the traffic policy.

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

  5. Apply the traffic policy.

    # Packets from PC1 to the Internet are received by GE2/0/1, so apply the traffic policy tp1 to the inbound direction of GE2/0/1.

    [Switch] interface gigabitethernet 2/0/1
    [Switch-GigabitEthernet2/0/1] traffic-policy tp1 inbound
    [Switch-GigabitEthernet2/0/1] quit

  6. Verify the configuration.

    # Check the configuration of the ACL rule.

    [Switch] display acl 4000
    L2 ACL 4000, 1 rule                                                             
    Acl's step is 5                                                                 
     rule 5 deny source-mac 00e0-f201-0101 

    # 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 4000  
    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                                                              

    # Check the traffic policy use records.

    [Switch] display traffic-policy applied-record
      Policy Name:   tp1                                                                                                                
      Policy Index:  0                                                                                                                  
         Classifier:tc1     Behavior:tb1                                                                                                
     *interface GigabitEthernet2/0/1                                                                             
        traffic-policy tp1 inbound                                                                                                      
          slot 2    :  success                                                                                                          
      Policy total applied times: 1.                                                                                                    

    # The user with MAC address 00e0-f201-0101 cannot access the Internet.

Configuration Files

Switch configuration file

sysname Switch
acl number 4000
 rule 5 deny source-mac 00e0-f201-0101
traffic classifier tc1 operator or precedence 5
 if-match acl 4000
traffic behavior tb1
traffic policy tp1 match-order config
 classifier tc1 behavior tb1
interface GigabitEthernet2/0/1
 traffic-policy tp1 inbound  
Updated: 2019-04-01

Document ID: EDOC1000178319

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