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NE20E-S2 V800R010C10SPC500 Configuration Guide - IP Services 01

This is NE20E-S2 V800R010C10SPC500 Configuration Guide - IP Services

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Configuring Routed Proxy ARP

Configuring Routed Proxy ARP

Routed proxy ARP allows devices that have IP addresses on the same network segment but different physical networks to communicate with each other.

Usage Scenario

A large company network is usually divided into multiple subnets to facilitate management. The routing information of a host in a subnet can be modified so that IP datagrams sent from this host to another subnet are first sent to the gateway and then to another subnet. However, this solution makes it hard to manage and maintain devices. Deploying proxy ARP on the gateway effectively resolves management and maintenance problems caused by network division.

Pre-configuration Tasks

Before configuring routed proxy ARP, complete the following tasks:

  • Configure physical parameters for interfaces to ensure that the physical status of the interfaces is Up.

  • Configure link layer protocol parameters for interfaces to ensure that the link layer protocol status of the interfaces is Up.

Configuration Procedures

Figure 2-1 Flowchart for configuring routed proxy ARP

Configuring an IP Addresses for an Interface

The IP address assigned to a routed proxy ARP-enabled interface must be on the same network segment with the IP address of the host on the LAN to which this interface connects.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number [ .subinterface-number ] interface-number

    The interface view is displayed.

  3. Run ip address ip-address { mask | mask-length } [ sub ]

    An IP address is configured for the interface.

  4. Run commit

    The configuration is committed.

Enabling Routed Proxy ARP

To allow subnets on the same IP network to communicate, enable routed proxy ARP.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number [ .subinterface-number ]

    The interface view is displayed.

  3. Run arp-proxy enable

    Routed proxy ARP is enabled on the interface.

    After routed proxy ARP is enabled, you must reduce the aging time of ARP entries on the device so that the number of packets received but cannot be forwarded by the device is decreased.

  4. Run commit

    The configuration is committed.

Verifying the Configuration of Routed Proxy ARP

After configuring routed proxy ARP, verify the configuration.

Prerequisites

Routed proxy ARP has been configured.

Procedure

  • Run the display arp interface interface-name command to check the ARP mapping table on a specified interface.
  • Run the display arp slot slot-id command to check the ARP mapping table on the board in a specified slot.
  • Run the display arp vpn-instance vpn-instance-name slot slot-id [ dynamic | static ] command to check the ARP mapping table for a specified VPN instance.

Example

Run the display arp interface command. The command output shows the ARP entries on a specified interface.

<HUAWEI> display arp interface gigabitethernet0/1/0
ARP timeout:1200s
IP ADDRESS      MAC ADDRESS     EXPIRE(M) TYPE        INTERFACE   VPN-INSTANCE
                                          VLAN/CEVLAN PVC
------------------------------------------------------------------------------
192.168.1.11    0000-0a41-0201            I -         GE0/1/0       r1
192.168.1.1     0000-0a41-0200  15        D-6         GE0/1/0       r1
------------------------------------------------------------------------------
Total:2         Dynamic:1       Static:0    Interface:1    Remote:0
Redirect:0

Run the display arp slot command. The command output shows the ARP entries on the board in a specified slot.

<HUAWEI> display arp slot 1
IP ADDRESS      MAC ADDRESS     EXPIRE(M) TYPE        INTERFACE   VPN-INSTANCE
                                          VLAN/CEVLAN PVC
------------------------------------------------------------------------------
192.168.1.12    0000-0a41-0202            I -         GE0/1/1       r2
192.168.1.1     0000-0a41-0200  17        D-6         GE0/1/1       r2
192.168.1.11    0000-0a41-0201            I -         GE0/1/0       r1
192.168.1.1     0000-0a41-0200  17        D-6         GE0/1/0       r1
------------------------------------------------------------------------------
Total:4         Dynamic:2       Static:0    Interface:2
Redirect:0

Run the display arp vpn-instance command. The command output shows the ARP mapping table for a specified VPN instance.

<HUAWEI> display arp vpn-instance r1
IP ADDRESS      MAC ADDRESS     EXPIRE(M) TYPE        INTERFACE   VPN-INSTANCE
                                          VLAN/CEVLAN PVC
------------------------------------------------------------------------------
192.168.1.11    0000-0a41-0201            I -         GE0/1/1       r1
192.168.1.1     0000-0a41-0200  12        D-6         GE0/1/2       r1
------------------------------------------------------------------------------
Total:2         Dynamic:1       Static:0    Interface:1    Remote:0
Redirect:0
Translation
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Updated: 2019-01-02

Document ID: EDOC1100055376

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