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Configuration Guide - IP Service

S1720, S2700, S5700, and S6720 V200R012(C00 and C20)

This document describes the configurations of IP Service, including IP address, ARP, DHCP, DHCP policy VLAN, DNS, mDNS gateway, mDNS relay, UDP Helper, IP performance optimization, IPv6, DHCPv6, IPv6 DNS, IPv6 over IPv4 tunnel, and IPv4 over IPv6 tunnel.
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Enabling the ARP Module to Send ARP Vlink Direct Routes to the RM Module

Enabling the ARP Module to Send ARP Vlink Direct Routes to the RM Module

Usage Scenario

ARP Vlink direct routes are 32-bit host routes that are generated based on ARP entries. In most cases, ARP Vlink direct routes are only used to guide local forwarding.

To control the scale and maintain the stability of a routing table, the ARP module does not send ARP Vlink direct routes to the route management (RM) module. In some scenarios, however, the device needs to perform operations based on specific routes of users. For example, the device needs to directly send the network traffic to specific user terminals, or route filtering is used to restrict inter-device communication.

Figure 2-22 shows an example.
Figure 2-22  Enabling the ARP module to send ARP Vlink direct routes to the RM module

In Figure 2-22, SwitchB connects to three users through the sub-interface. Based on service requirements, RouterD only needs to interconnect with RouterB, not RouterA or RouterC.

You can enable the ARP module to send ARP Vlink direct routes on SwitchB, and uses the routing policy to filter out the network segment routes and the routes to RouterA and RouterC, and to reserve the ARP Vlink direct route to RouterB. This allows precise control of the traffic between RouterD and RouterB.

NOTE:

The ARP module can be enabled to send ARP Vlink direct routes to the RM module only on the S5720EI, S5720HI, S5730HI, S6720EI, S6720HI, and S6720S-EI.

Pre-configuration Tasks

Before enabling the ARP module to send ARP Vlink direct routes to the RM module, configure a sub-interface. For more details about sub-interfaces, see Configuring an Ethernet Sub-interface in "Logical Interface Configuration" in the S1720, S2700, S5700, and S6720 V200R012(C00&C20) Configuration Guide - Interface Management.

Procedure

  1. Run system-view

    The system view is displayed.

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

    A sub-interface is created, and the sub-interface view is displayed.

  3. Run arp direct-route enable

    The ARP module is enabled to send ARP Vlink direct routes of the sub-interface to the RM module.

    By default, the ARP module is disabled from sending ARP Vlink direct routes to the RM module.

Verifying the Configuration

Run the display this include-default command in the sub-interface view to check whether the ARP module is enabled to send ARP Vlink direct routes of the sub-interface to the RM module.

Follow-up Procedure

If you require the device to advertise ARP Vlink direct routes to upstream devices after enabling the ARP module to send ARP Vlink direct routes to the RM module, perform the following operations in sequence:
  1. Run the arp vlink-direct-route advertise command to configure the device to advertise ARP Vlink direct routes.
  2. Run the following commands based on the routing protocols running on the device:
    • Run the import-route direct [ cost cost | route-policy route-policy-name ] * command to import ARP Vlink direct routes to RIP for advertisement.
    • Run the import-route direct [ cost cost | route-policy route-policy-name | tag tag | type type ] * command to import ARP Vlink direct routes to OSPF for advertisement.
    • Run the import-route direct [ cost-type { external | internal } | cost cost | tag tag | route-policy route-policy-name | [ level-1 | level-2 | level-1-2 ] ] * command to import ARP Vlink direct routes to IS-IS for advertisement.
    • Run the import-route direct [ med med | route-policy route-policy-name ] * command to import ARP Vlink direct routes to BGP for advertisement.
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Updated: 2018-12-24

Document ID: EDOC1100038342

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