arp vpn-cross enable

Function

The arp vpn-cross enable command enables direct ARP entry delivery for mutual access between local VPNs.

The undo arp vpn-cross enable command disables direct ARP entry delivery for mutual access between local VPNs.

By default, direct ARP entry delivery is disabled for mutual access between local VPNs.

Only the S5720-EI, S5720-HI, S5730-HI, S5731-S, S5731S-S, S5731-H, S5732-H, S5735-S, S5735S-S, S5735-S-I, S6720S-EI, S6720-EI, S6720-HI, S6730-S, S6730S-S, S6730S-H, and S6730-H support this command.

Format

arp vpn-cross enable

undo arp vpn-cross enable

Parameters

None

Views

System view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

The initial traffic between two local VPNs triggers ARP Miss messages and ARP learning. If a PE device fails to timely process the ARP Miss messages due to some reasons, mutual access traffic between the VPNs cannot be transmitted.

After direct ARP entry delivery is enabled on the PE device, the PE device delivers ARP entries before the mutual access traffic triggers ARP Miss messages and ARP learning. This ensures normal traffic transmission between local VPNs.

Precautions

ARP entry delivery before triggering of ARP Miss messages and ARP learning consumes ARP entries. Configure this command only when required.

Example

# Enable direct ARP entry delivery for mutual access between local VPNs.

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