HP 6125XLG R2306-HP 6125XLG Blade Switch Security Command Reference - Page 228

arp scan, Dynamic ARP

Page 228 highlights

[Sysname] arp fixup arp scan Use arp scan to enable ARP automatic scanning in the specified address range. Syntax arp scan [ start-ip-address to end-ip-address ] Views VLAN interface view Predefined user roles network-admin 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. Usage guidelines If you specify the start and end IP addresses, the device scans the neighbor IP addresses in the specified address range to learn ARP entries. If the sending interface has multiple IP addresses falling within the specified address range, the sender IP address in the sent ARP requests is the interface address on the smallest network segment. If you do not specify any address range, the device only scans neighbors on the network where the primary IP address of the interface resides. 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 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 neighbors on the network where the primary IP address of VLAN-interface 2 resides. system-view [Sysname] interface vlan-interface 2 [Sysname-Vlan-interface2] arp scan # Configure the device to scan neighbors on the specified address range. system-view [Sysname] interface vlan-interface 2 [Sysname-Vlan-interface2] arp scan 1.1.1.1 to 1.1.1.20 219

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219
[Sysname] arp fixup
arp scan
Use
arp scan
to enable ARP automatic scanning in the specified address range.
Syntax
arp scan
[
start-ip-address
to
end-ip-address
]
Views
VLAN interface view
Predefined user roles
network-admin
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.
Usage guidelines
If you specify the start and end IP addresses, the device scans the neighbor IP addresses in the specified
address range to learn ARP entries. If the sending interface has multiple IP addresses falling within the
specified address range, the sender IP address in the sent ARP requests is the interface address on the
smallest network segment.
If you do not specify any address range, the device only scans neighbors on the network where the
primary IP address of the interface resides. 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 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 neighbors on the network where the primary IP address of
VLAN-interface 2 resides.
<Sysname> system-view
[Sysname] interface vlan-interface 2
[Sysname-Vlan-interface2] arp scan
# Configure the device to scan neighbors on the specified address range.
<Sysname> system-view
[Sysname] interface vlan-interface 2
[Sysname-Vlan-interface2] arp scan 1.1.1.1 to 1.1.1.20