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AR100-S, AR110-S, AR120-S, AR150-S, AR160-S, AR200-S, AR1200-S, AR2200-S, and AR3200-S V200R009 CLI-based Configuration Guide - Ethernet Switching

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(Optional) Enabling Proxy ARP on the VLANIF Interface Corresponding to a Super-VLAN

(Optional) Enabling Proxy ARP on the VLANIF Interface Corresponding to a Super-VLAN

Context

VLAN aggregation allows sub-VLANs to use the same subnet address, but prevents PCs in different sub-VLANs from communicating with each other at the network layer.

PCs in common VLANs can communicate with each other at the network layer using different gateway addresses. VLAN aggregation enables PCs in a super-VLAN to use the same subnet address and gateway address. Because PCs in different sub-VLANs belong to one subnet, they communicate with each other only at Layer 2 but not Layer 3. These PCs are isolated from each other at Layer 2. Consequently, PCs in different sub-VLANs cannot communicate with each other.

Proxy ARP is required to enable PCs in a sub-VLAN to communicate with PCs in another sub-VLAN or PCs on other networks. After a super-VLAN and its VLANIF interface are created, proxy ARP must be enabled to allow the super-VLAN to forward or process ARP Request and Reply packets. Proxy ARP allows PCs in sub-VLANs to communicate with each other at the network layer.

NOTE:

After proxy ARP is enabled on the VLANIF interface corresponding to a super-VLAN, hosts in all sub-VLANs of the super-VLAN can communicate.

VLAN aggregation simplifies configurations for the network where many VLANs are configured and PCs in different VLANs need to communicate with each other.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface vlanif vlan-id

    The view of the VLANIF interface corresponding to the super-VLAN is displayed.

  3. Run arp-proxy inter-sub-vlan-proxy enable

    Proxy ARP is enabled between sub-VLANs.

Translation
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Updated: 2019-05-17

Document ID: EDOC1000174108

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