H3C MSR 2600 Configuration Manual page 207

Figure 74 Application environment of local ND proxy
Because Host A's IPv6 address is on the same subnet as Host B's, Host A directly sends an NS
message to obtain Host B's MAC address. However, Host B cannot receive the NS message
because they are isolated at Layer 2.
To solve this problem, enable local ND proxy on Ethernet 1/2 of the router so that the router can
forward messages between Host A and Host B.
Local ND proxy implements Layer 3 communication for two hosts in the following cases:
The two hosts must connect to different isolated Layer 2 ports of a VLAN.
If super VLAN is used, the two hosts must belong to different sub VLANs.
If isolate-user-VLAN is used, the two hosts must belong to different secondary VLANs.
Configuration procedure
You can enable common ND proxy and local ND proxy in VLAN interface view, Layer 3 Ethernet
interface view, or Layer 3 Ethernet subinterface view.
To enable common ND proxy:
Step
1. Enter system view.
2. Enter interface view.
3. Enable common ND proxy.
To enable local ND proxy:
Step
1. Enter system view.
2. Enter interface view.
3. Enable local ND proxy.
Command
system-view
interface interface-type
interface-number
proxy-nd enable
Command
system-view
interface interface-type
interface-number
local-proxy-nd enable
192
Remarks
N/A
N/A
By default, common ND proxy is
disabled.
Remarks
N/A
N/A
By default, local ND proxy is
disabled.