nd vpn-cross enable

Function

The nd vpn-cross enable command enables direct ND entry delivery for mutual access between IPv6 VPNs.

The undo nd vpn-cross enable command disables direct ND entry delivery for mutual access between IPv6 VPNs.

By default, direct ND entry delivery for mutual access between IPv6 VPNs is disabled.

Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731S-H, S5732-H, S6720S-EI, S6720-EI, S6720-HI, S6730S-H, and S6730-H support this command.

Format

nd vpn-cross enable

undo nd vpn-cross enable

Parameters

None

Views

System view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

In a scenario of mutual access between IPv6 VPNs, traffic initiated during mutual access for the first time will trigger ND Miss messages and ND entry learning. If a PE device fails to process the ND Miss messages in time (for example, when a new card is installed), mutual access traffic between the VPNs cannot be transmitted.

After direct ND entry delivery for mutual access between IPv6 VPNs is enabled on the PE device, the device delivers ND entries in advance when a new card is installed without the need to trigger mutual access traffic. This ensures proper transmission of mutual access traffic between local VPNs.

Precautions

After direct ND entry delivery for mutual access between IPv6 VPNs is enabled, the ND entries delivered by the device in advance will consume some ND entry resources. Therefore, configure this function only when required.

Example

# Enable direct ND entry delivery for mutual access between IPv6 VPNs.

<HUAWEI> system-view
[HUAWEI] nd vpn-cross enable
Warning: After this function is enabled, a large number of ND entries will be occupied.