User Manual UMN:CLI
V5808
229
To clear collected statistics of the ARP inspection, use the following command.
clear ip arp inspection statistics
[vlan VLANS]
Clears collected statistics of the ARP inspection.
7.15.5 Gratuitous ARP
Gratuitous ARP is a broadcast packet like an ARP request. It containing IP address and
MAC address of gateway, and the network is accessible even though IP addresses of
specific host’s gateway are repeatedly assigned to the other.
Configure Gratuitous ARP interval and transmission count using following commands.
And configure transmission delivery-start in order to transmit Gratuitous ARP after ARP
reply. Gratuitous ARP is transmitted after some time from transmitting ARP reply.
arp patrol TIME COUNT [TIME]
Configures a gratuitous ARP.
TIME: transmit interval
COUNT: transmit count
Disables a gratuitous ARP.
7.15.6 Proxy ARP
The V5808 supports the proxy ARP. Proxy ARP is the technique in which one host,
usually a router, answers ARP requests intended for another machine. By “faking” its
identity, the router accepts responsibility for routing packets to the “real” destination.
Proxy ARP can help the switches on a subnet reach remote subnets without configuring
routing or a default gateway.
As shown in Fig. 7.15, the host A has a /16 subnet mask. What this means is that the host
A believes that it is directly connected to all of network 172.16.0.0. When the host A
needs to communicate with any switches if believes are directly connected, it will send an
ARP request to the destination. Therefore, when the host A needs to send a packet to the
host D, the host A believes that the host D is directly connected, so it sends an ARP
request to the host D.
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