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NE40E-M2 V800R010C10SPC500 Feature Description - User Access 01

This is NE40E-M2 V800R010C10SPC500 Feature Description - User Access
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Principles of ND Proxy

Principles of ND Proxy

When two hosts whose addresses have the same prefix communicate with each other, they do not search routing tables. Instead, one of them sends a Neighbor Solicitation (NS) packet to obtain the link layer address corresponding to the destination address, and then use the link layer address to encapsulate data packets.

In practice, hosts whose addresses have the same prefix cannot belong to the same broadcast domain because NS packets cannot be sent to a destination host and therefore the hosts cannot communicate with each other.

To make these hosts communicate with each other, you can enable ND proxy on the BRAS so that the BRAS rather than a host can reply with a Neighbor Advertise (NA) packet that carries the link layer address of the BRAS. With the help of the BRAS, two hosts whose addresses have the same prefix can communicate with each other.

Figure 4-1 Principle of ND proxy

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Updated: 2019-01-02

Document ID: EDOC1100058415

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