arp scan

Syntax

arp scan [ start-ip-address to end-ip-address ]

View

VLAN interface view

Default level

2: System level

Parameters

start-ip-address: Specifies the start IP address of the scanning range.

end-ip-address: Specifies the end IP address of the scanning range. The end IP address must be higher than or equal to the start IP address.

Description

Use arp scan to enable ARP automatic scanning in the specified address range for neighbors.

If the start IP and end IP addresses are specified, the device scans the specific address range for neighbors and learns their ARP entries, so that the scanning time is reduced. If the specified address range contains multiple network segments, the sender IP address in the ARP request is the interface address on the smallest network segment.

If no address range is specified, the device only scans the network where the primary IP address of the interface resides for neighbors. The sender IP address in the ARP requests is the primary IP address of the interface.

The start IP address and end IP address must be on the same network as the primary IP address or manually configured secondary IP addresses of the interface.

IP addresses that already exist in ARP entries are not scanned.

ARP automatic scanning may take some time. To stop an ongoing scan, press Ctrl + C. Dynamic ARP entries are created based on ARP replies received before the scan is terminated.

Examples

# Configure the device to scan the network where the primary IP address of VLAN-interface 2 resides for neighbors.

<Sysname> system-view
[Sysname] interface vlan-interface 2
[Sysname-Vlan-interface2] arp scan

# Configure the device to scan a specific address range for neighbors.

<Sysname> system-view
[Sysname] interface vlan-interface 2
[Sysname-Vlan-interface2] arp scan 1.1.1.1 to 1.1.1.20