Example for Configuring MFF to Implement Layer 2 Isolation and Layer 3 Connection

CloudEngine 12800 and 12800E V200R005C10 Configuration Guide - Security

This document describes the configurations of Security, including AAA, 802.1x Authentication, ACL, TCAM ACL Customization, local attack defense, Microsegmentation, MFF, attack defense, traffic suppression and storm control, ARP security, Port security, MACsec, DHCP snooping, IPSG, URPF, SSL, Keychain and FIPS.

About This Document
AAA Configuration
- Overview of AAA
- Understanding AAA
- Application Scenarios for AAA
- Licensing Requirements and Limitations for AAA
- Summary of AAA Configuration Tasks
- Configuring Local Authentication and Authorization
- Configuring RADIUS AAA
- Configuring HWTACACS AAA
- Clearing AAA Statistics
- Configuration Examples for AAA
  - Example for Configuring RADIUS Authentication and Accounting
  - Example for Configuring HWTACACS Authentication, Accounting, and Authorization
- Troubleshooting AAA
  - An AAA Local User Cannot Be Created Due to Incorrect Password Setting
802.1x Authentication Configuration
- Understanding 802.1x Authentication
- Application Scenarios for 802.1x Authentication
- Licensing Requirements and Limitations for 802.1x Authentication
- Default Settings for 802.1x Authentication
- Configuring 802.1x Authentication
- Maintaining 802.1x Authentication
  - Clearing Statistics on 802.1x Authentication Packets
  - Forcing Users Offline
- Configuration Examples for 802.1x Authentication
  - Example for Configuring 802.1x Authentication to Control Users' Internal Access
ACL Configuration
- Overview of ACLs
- Understanding ACLs
- Application Scenarios for ACLs
- Licensing Requirements and Limitations for ACLs
- Default Settings for ACLs
- Configuring a Basic ACL
- Configuring an Advanced ACL
- Configuring a Layer 2 ACL
- Configuring a User-defined ACL
- Configuring an ARP-based ACL
- Configuring a Basic ACL6
- Configuring an Advanced ACL6
- Maintaining an ACL
  - Clearing ACL Statistics
  - Checking ACL Resource Usages
- Configuration Examples for ACLs
- ACL FAQ
  - Which Packets Cannot Be Filtered by the ACL Used by a Traffic Policy?
TCAM ACL Customization Configuration
- Overview of TCAM ACL Customization
- Licensing Requirements and Limitations for TCAM ACL Customization
- Configuring TCAM ACL Customization
  - Enabling TCAM ACL Customization
  - Configuring the TCAM ACL Customization Function for Services
- Displaying Information about a TCAM ACL Customization Profile or Preset Profile
- Configuration Examples for TCAM ACL Customization
  - Example for Configuring TCAM ACL Customization
Microsegmentation Configuration
- Overview of Microsegmentation
- Understanding Microsegmentation
- Application Scenarios for Microsegmentation
- Licensing Requirements and Limitations for Microsegmentation
- Configuring Microsegmentation
- Maintaining Microsegmentation
  - Checking Microsegmentation Statistics
  - Clearing Microsegmentation Statistics
- Configuration Examples for Microsegmentation
  - Example for Configuring IP Address-based Microsegmentation
Local Attack Defense Configuration
- Overview of Local Attack Defense
- Licensing Requirements and Limitations for Local Attack Defense
- Default Settings for Local Attack Defense
- Configuring CPU Attack Defense
- Configuring Attack Source Tracing
- Maintaining Local Attack Defense
- Configuration Examples for Local Attack Defense
  - Example for Configuring Local Attack Defense
- Troubleshooting Local Attack Defense
MFF Configuration
- Overview of MFF
- Understanding MFF
- Application Scenarios for MFF
- Licensing Requirements and Limitations for MFF
- Configuring MFF
- Configuration Examples for MFF
  - Example for Configuring MFF to Implement Layer 2 Isolation and Layer 3 Connection
- Troubleshooting MFF
  - Users Fail to Access the Internet After MFF Is Configured
Attack Defense Configuration
- Overview of Attack Defense
- Understanding Attack Defense
- Application Scenarios for Attack Defense
- Licensing Requirements and Limitations for Attack Defense
- Default Settings for Attack Defense
- Configuring Defense Against Malformed Packet Attacks
- Configuring Defense Against Packet Fragment Attacks
- Configuring Defense Against Flood Attacks
- Clearing Attack Defense Statistics
- Configuration Examples for Attack Defense
  - Example for Configuring Attack Defense
Traffic Suppression and Storm Control Configuration
- Overview of Traffic Suppression and Storm Control
- Understanding Traffic Suppression and Storm Control
  - Traffic Suppression
  - Storm Control
- Application Scenarios for Traffic Suppression and Storm Control
  - Traffic Suppression
  - Storm Control
- Licensing Requirements and Limitations for Traffic Suppression and Storm Control
- Default Settings for Traffic Suppression and Storm Control
- Configuring Traffic Suppression
- Configuring Storm Control
- Configuration Examples for Traffic Suppression and Storm Control
  - Example for Configuring Traffic Suppression
  - Example for Configuring Storm Control
ARP Security Configuration
- Overview of ARP Security
- Understanding ARP Security
- Application Scenarios for ARP Security
  - Defense Against ARP Flood Attacks
  - Defense Against ARP Spoofing Attacks
- Licensing Requirements and Limitations for ARP Security
- Default Settings for ARP Security
- Configuring Defense Against ARP Flood Attacks
- Configuring Defense Against ARP Spoofing Attacks
- Maintaining ARP Security
- Configuration Examples for ARP Security
  - Example for Configuring ARP Security Functions
  - Example for Configuring Defense Against ARP MITM Attacks
Port Security Configuration
- Overview of Port Security
- Understanding Port Security
- Application Scenarios for Port Security
- Licensing Requirements and Limitations for Port Security
- Default Settings for Port Security
- Configuring Port Security
- Configuration Examples for Port Security
  - Example for Configuring Port Security
MACsec Configuration
- Overview of MACsec
- Understanding MACsec
- Application Scenarios for MACsec
- Default Configuration
- Licensing Requirements and Limitations for MACsec
- Configuring MACsec
- Maintaining MACsec
  - Displaying MACsec Statistics
  - Clearing MACsec Statistics
- Configuration Examples for MACsec
  - Example for Configuring Point-to-Point MACsec
DHCP Snooping Configuration
- Overview of DHCP Snooping
- Understanding DHCP Snooping
  - DHCP Snooping Fundamentals
  - Option 82 Supported by DHCP Snooping
- Application Scenarios for DHCP Snooping
- Licensing Requirements and Limitations for DHCP Snooping
- Default Settings for DHCP Snooping
- Configuring Basic Functions of DHCP Snooping
- Configuring DHCP Snooping Attack Defense
- Inserting the Option 82 Field in a DHCP Message
- Maintaining DHCP Snooping
- Configuration Examples for DHCP Snooping
  - Example for Configuring DHCP Snooping Attack Defense
- Troubleshooting DHCP Snooping
  - DHCP Clients Cannot Go Online Due to DHCP Snooping
IPSG Configuration
- Overview of IPSG
- Licensing Requirements and Limitations for IPSG
- Default Settings for IPSG
- Configuring IPSG
- Maintaining IPSG
  - Checking Statistics on Discarded IP Packets
  - Clearing Statistics on Discarded IP Packets
- Configuration Examples for IPSG
  - Example for Configuring IPSG to Check Interface + IP + MAC Binding Entries
URPF Configuration
- Overview of URPF
- Understanding URPF
- Application Scenarios for URPF
- Licensing Requirements and Limitations for URPF
- Default Settings for URPF
- Configuring URPF
- Configuration Examples for URPF
  - Example for Configuring URPF (CE12800)
  - Example for Configuring URPF (CE12800E)
SSL Configuration
- Overview of SSL
- Understanding SSL
- Application Scenarios for SSL
  - Application of SSL in Information Center
- Licensing Requirements and Limitations for SSL
- Configuring SSL
  - Configuring an SSL Policy
  - Applying an SSL Policy
- Configuration Examples for SSL
  - Example for Outputting SSL-Encrypted Logs to a Log Host
Keychain Configuration
- Overview of Keychains
- Understanding Keychains
- Application Scenarios for Keychains
- Licensing Requirements and Limitations for Keychain
- Configuring a Keychain
- Configuration Examples for Keychains
  - Example for Applying the Keychain to RIP
  - Example for Applying the Keychain to BGP
FIPS Configuration
- Overview of FIPS
- Configuring the FIPS Mode
Separating the Management Port from the Service Plane
Checking Security Risks
Setting the System Master Key

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Example for Configuring MFF to Implement Layer 2 Isolation and Layer 3 Connection

Networking Requirements

As shown in Figure 7-5, a department of an enterprise uses SwitchA and SwitchB as the access devices for users, and SwitchC functions as the aggregation device. The administrator requires that user hosts in VLAN 10 be isolated on the access device and communicate with each other through the gateway. This allows the gateway to monitor user traffic. When a large number of users exist on the network, a DHCP server is deployed to allocate IP addresses to the users. Forwarding heavy amounts of traffic between the application server and users will cause the gateway to overload. Therefore, the administrator configures the application server (DHCP server) to transparently transmit user traffic.

Figure 7-5 Networking diagram for MFF configuration

Configuration Roadmap

The configuration roadmap is as follows:

Configure DHCP snooping on SwitchA and SwitchB to provide dynamic user information such as IP address, MAC address, and VLAN to implement Layer 2 isolation and Layer 3 connection.
Configure MFF on SwitchA and SwitchB to redirect user traffic to the gateway so that users are isolated at Layer 2 and communicate with each other at Layer 3. This configuration also allows the gateway to monitor user traffic.
Configure the DHCP server address on SwitchA and SwitchB so that traffic from the DHCP server to users can be transparently transmitted at Layer 2. This configuration relieves the traffic load on the gateway.
Configure transparent transmission of ARP request packets on SwitchA and SwitchB so that the gateway can detect the user status immediately.

Procedure

Create VLANs and add interfaces to the VLANs.

# Create VLAN 10 on SwitchA and add interfaces 10GE1/0/1, 10GE1/0/2, and 10GE1/0/3 to VLAN 10.

<HUAWEI> system-view
[~HUAWEI] sysname SwitchA
[*HUAWEI] commit
[~SwitchA] vlan batch 10

[*SwitchA] interface 10ge 1/0/1
[*SwitchA-10GE1/0/1] port link-type access
[*SwitchA-10GE1/0/1] port default vlan 10
[*SwitchA-10GE1/0/1] quit

[*SwitchA] interface 10ge 1/0/2
[*SwitchA-10GE1/0/2] port link-type access
[*SwitchA-10GE1/0/2] port default vlan 10
[*SwitchA-10GE1/0/2] quit

[*SwitchA] interface 10ge 1/0/3
[*SwitchA-10GE1/0/3] port link-type trunk
[*SwitchA-10GE1/0/3] port trunk allow-pass vlan 10
[*SwitchA-10GE1/0/3] quit

# Create VLAN 10 on SwitchB and add interfaces 10GE1/0/1, 10GE1/0/2, and 10GE1/0/3 to VLAN 10.

<HUAWEI> system-view
[~HUAWEI] sysname SwitchB
[*HUAWEI] commit
[~SwitchB] vlan batch 10

[*SwitchB] interface 10ge 1/0/1
[*SwitchB-10GE1/0/1] port link-type access
[*SwitchB-10GE1/0/1] port default vlan 10
[*SwitchB-10GE1/0/1] quit

[*SwitchB] interface 10ge 1/0/2
[*SwitchB-10GE1/0/2] port link-type access
[*SwitchB-10GE1/0/2] port default vlan 10
[*SwitchB-10GE1/0/2] quit

[*SwitchB] interface 10ge 1/0/3
[*SwitchB-10GE1/0/3] port link-type trunk
[*SwitchB-10GE1/0/3] port trunk allow-pass vlan 10
[*SwitchB-10GE1/0/3] quit

Configure DHCP snooping.

# Enable global DHCP snooping on SwitchA.

[*SwitchA] dhcp enable
[*SwitchA] dhcp snooping enable

# All user hosts are in VLAN 10, so enable DHCP snooping for VLAN 10 on SwitchA.

[*SwitchA] vlan 10
[*SwitchA-vlan10] dhcp snooping enable
[*SwitchA-vlan10] quit

# Configure 10GE1/0/3 on SwitchA as the trusted interface.

[*SwitchA] interface 10ge 1/0/3

[*SwitchA-10GE1/0/3] dhcp snooping trusted

[*SwitchA-10GE1/0/3] quit

# Enable global DHCP snooping on SwitchB.

[*SwitchB] dhcp enable
[*SwitchB] dhcp snooping enable

# All user hosts are in VLAN 10, so enable DHCP snooping for VLAN 10 on SwitchB.

[*SwitchB] vlan 10
[*SwitchB-vlan10] dhcp snooping enable
[*SwitchB-vlan10] quit

# Configure 10GE1/0/3 on SwitchB as the trusted interface.

[*SwitchB] interface 10ge 1/0/3

[*SwitchB-10GE1/0/3] dhcp snooping trusted

[*SwitchB-10GE1/0/3] quit

Configure basic MFF functions.

# Enable global MFF on SwitchA.

[*SwitchA] mac-forced-forwarding enable

# Configure 10GE1/0/3 on SwitchA as a network interface.

[*SwitchA] interface 10ge 1/0/3

[*SwitchA-10GE1/0/3] mac-forced-forwarding network-port

[*SwitchA-10GE1/0/3] quit

# Enable MFF in VLAN 10 on SwitchA.

[*SwitchA] vlan 10

[*SwitchA-vlan10] mac-forced-forwarding enable

# Configure timed gateway detection on SwitchA.

[*SwitchA-vlan10] mac-forced-forwarding gateway-detect

# Enable global MFF on SwitchB.

[*SwitchB] mac-forced-forwarding enable

# Configure 10GE1/0/3 on SwitchB as a network interface.

[*SwitchB] interface 10ge 1/0/3

[*SwitchB-10GE1/0/3] mac-forced-forwarding network-port

[*SwitchB-10GE1/0/3] quit

# Enable MFF in VLAN 10 on SwitchB.

[*SwitchB] vlan 10

[*SwitchB-vlan10] mac-forced-forwarding enable

# Configure timed gateway detection on SwitchB.

[*SwitchB-vlan10] mac-forced-forwarding gateway-detect

Set the application server IP address.
# Set the application server IP address on SwitchA.
```
[*SwitchA-vlan10] mac-forced-forwarding server 10.1.1.2
```
# Set the application server IP address on SwitchB.
```
[*SwitchB-vlan10] mac-forced-forwarding server 10.1.1.2
```

Configure transparent transmission of ARP request packets.

# Configure SwitchA to transparently transmit ARP request packets.

[*SwitchA-vlan10] mac-forced-forwarding user-detect transparent

[*SwitchA-vlan10] quit

[*SwitchA] commit

[~SwitchA] quit

# Configure SwitchB to transparently transmit ARP request packets.

[*SwitchB-vlan10] mac-forced-forwarding user-detect transparent

[*SwitchB-vlan10] quit

[*SwitchB] commit

[~SwitchB] quit

Verify the configuration.

# Run the display mac-forced-forwarding vlan 10 command to view the MFF configuration in VLAN 10.

<SwitchB> display mac-forced-forwarding vlan 10

Flags: S - static, D - dynamic      
---------------------------------------------------------------------------     
Gateway detect         : enable                                                 
Dynamic user learning  : enable                                                 
User-detect transparent: enable                                                 
Static gateway         : -                                                      
Max user               : -                                                      
Servers                : 10.1.1.2
                 
---------------------------------------------------------------------------
Gateway IP      Gateway MAC
---------------------------------------------------------------------------
10.1.1.1       3867-9a11-0111  
10.1.1.2       3867-9a11-0112  
---------------------------------------------------------------------------
                                 
---------------------------------------------------------------------------
User IP         User MAC        Gateway IP      Interface             Flags 
---------------------------------------------------------------------------
10.1.1.10      0001-0001-0002   10.1.1.1       10GE1/0/2              D 
---------------------------------------------------------------------------
MFF host total count = 1

# After the gateway interface connected to SwitchC is shut down, users in VLAN 10 cannot ping each other. After the gateway interface is recovered, users can ping each other. This indicates that the users are isolated at Layer 2 and communicate with each other at Layer 3. The MFF function takes effect.

Configuration Files

Configuration file of SwitchA

#
sysname SwitchA
#
vlan batch 10
#
mac-forced-forwarding enable
#
dhcp enable
#
dhcp snooping enable
#
vlan 10
 dhcp snooping enable  
 mac-forced-forwarding enable
 mac-forced-forwarding user-detect transparent
 mac-forced-forwarding gateway-detect
 mac-forced-forwarding server 10.1.1.2
#
interface 10GE1/0/1
 port default vlan 10
#
interface 10GE1/0/2
 port default vlan 10
#
interface 10GE1/0/3
 port link-type trunk
 port trunk allow-pass vlan 10
 mac-forced-forwarding network-port
 dhcp snooping trusted
#
return

Configuration file of SwitchB

#
sysname SwitchB
#
vlan batch 10 
#
mac-forced-forwarding enable
#
dhcp enable
#
dhcp snooping enable
#
vlan 10
 dhcp snooping enable  
 mac-forced-forwarding enable
 mac-forced-forwarding user-detect transparent
 mac-forced-forwarding gateway-detect
 mac-forced-forwarding server 10.1.1.2
#
interface 10GE1/0/1
 port default vlan 10
#
interface 10GE1/0/2
 port default vlan 10
#
interface 10GE1/0/3
 port link-type trunk
 port trunk allow-pass vlan 10
 mac-forced-forwarding network-port
 dhcp snooping trusted
#
return

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Updated: 2021-09-17

Document ID: EDOC1100075347

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