HPE 3100 Configuration Manual page 139

As shown in 0, VLAN-interface 1 with IPv6 address 4:1::99/64 and VLAN-interface 2 with IPv6
address 4:2::99/64 belong to different subnets. Host A and Host B reside on the same network
but in different broadcast domains.
Figure 56 Application environment of common 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 belong to different broadcast domains.
To solve this problem, enable common ND proxy on VLAN-interface 1 and VLAN-interface 2 of
the switch. The switch finds the matching forwarding entry according to the destination IPv6
address of the NS message and sends the message through the output interface of that entry.
Upon receiving the NS message, Host B sends an NA message to the switch, which forwards it
to Host A.
•
Local ND proxy
As shown in
1/0/3 and Ethernet 1/0/1 respectively, which are isolated at Layer 2.
Figure 57 Application environment of local ND proxy
Host A
4:1::100/16
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 VLAN-interface 2 of the switch A so that the
switch A 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 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.
To enable common ND proxy:
Figure 57, both Host A and Host B belong to VLAN 2, but they connect to Ethernet
Switch A
Vlan-int2
4:3::100/16
Eth1/0/2
Eth1/0/3
Eth1/0/1
Switch B
VLAN 2
port-isolate group
Host B
4:2::100/16
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