HP VPN Firewall Appliances Network Management Configuration Guide

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virtual IP address of the VRRP group is associated with the real MAC address of an interface, the

sender MAC address in the gratuitous ARP packet is the MAC address of the interface on the

master router in the VRRP group.

• Update MAC entries of devices in the VLANs having ambiguous VLAN termination configured.

In VRRP configuration, if ambiguous VLAN termination is configured for many VLANs and VRRP

groups, interfaces configured with VLAN termination need to be disabled from transmitting

broadcast/multicast packets and a VRRP control VLAN needs to be configured so that VRRP

advertisements can be transmitted within the control VLAN only. In such cases, you can enable

periodic sending of gratuitous ARP packets containing the VRRP virtual IP address, and the primary

IP address or a manually configured secondary IP address of the sending interface on the

subinterfaces. In this way, when a VRRP failover occurs, devices in the VLANs having ambiguous

VLAN termination configured can use the gratuitous ARP packets to update their corresponding

MAC entries in time.

For more information about VRRP, see High Availability Configuration Guide.

Configuring gratuitous ARP in the Web interface

1. From the navigation tree, select Firewall > ARP Management > Gratuitous ARP to enter the page

shown in Figure 170.

2. Configure the gratuitous ARP as described in Table 32.

3. Clic

k Apply.

Figure 170 Gratuitous ARP configuration page

Table 32 Configuration items

Item Descri

tion

Disable gratuitous ARP packets learning function.

Select this box to disable learning of ARP entries

according to gratuitous ARP packets.

Send gratuitous ARP packets when receiving ARP

requests from another network segment.

Select this box to enable the device to send gratuitous

ARP packets upon receiving ARP requests from

another network segment.

Configuring gratuitous ARP at the CLI

Configuration guidelines

When you configure gratuitous ARP, follow these guidelines:

• You can enable periodic sending of gratuitous ARP packets on a maximum of 1024 interfaces.