Configuring Gratuitous Arp - 3Com Switch 4800G 24-Port Configuration Manual

Switch 4800g family 24-port, pwr 24-port, 48-port, pwr 48-port, 24-port sfp

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Product manual (13 pages)

Datasheet (8 pages)

Configuration manual (27 pages)

Table of Contents

ARP Configuration

Gratuitous ARP

Introduction to

Gratuitous ARP

Configuring Gratuitous

Network requirements

Enable the ARP entry check.

Set the aging time for dynamic ARP entries to 10 minutes.

Set the maximum number of dynamic ARP entries that VLAN-interface 10 can

learn to 1000.

Add a static ARP entry, with the IP address being 192.168.1.1/24, the MAC

address being 000f-e201-0000, and the outbound port being GigabitEthernet

1/0/10 of VLAN 10.

Configuration procedure

<Sysname> system-view

[Sysname] arp check enable

[Sysname] arp timer aging 10

[Sysname] vlan 10

[Sysname-vlan10] port gigabitethernet 1/0/10

[Sysname-vlan10] quit

[Sysname] interface vlan-interface 10

[Sysname-vlan-interface10] arp max-learning-num 1000

[Sysname-vlan-interface10] quit

[Sysname] arp static 192.168.1.1 000f-e201-0000 10 gigabitethernet1/0/10

A gratuitous ARP packet is a special ARP packet, in which the source IP address

and destination IP address are both the IP address of the sender, the source MAC

address is the MAC address of the sender, and the destination MAC address is a

broadcast address.

A device can implement the following functions by sending gratuitous ARP

Determining whether its IP address is already used by another device.

Informing other devices of its MAC address change so that they can update

their ARP entries.

A device receiving a gratuitous ARP packet can add the information carried in the

packet to its own dynamic ARP mapping table if it finds no corresponding ARP

entry for the ARP packet in the cache.

Follow these steps to configure gratuitous ARP:

Enter system view

Enable the device to send

gratuitous ARP packets when

receiving ARP requests from

another network segment