Ericsson EFN324, User Manual, Page: 66 / 176

IndexIndex
ARP requests from the gateway (all other uplink sources are discarded) are
only forwarded to the End­user with the IP address in the ARP request. The
response from the End­user will also be forwarded.
8.1.4 ARP Handler
The ARP Handler allows the EFN324 to increase the ARP Processing
Performance. The EFN324 will discard the ARP requests received on the
uplink with a source MAC that is not equal to that of the gateway. This feature
is enabled when the switching domain is configured with switching rule =
ip_validation or virtual_mac. This is done to avoid processing ARPs that are
not relevant to the EFN.
Improved handling of the ARPs is achieved by forwarding the ARPs to the
Host if, and only if, the Client IP address is already known. Previously, some of
the ARPs sent by the Host to the Clients may not have been answered
because they were not destined for those Clients. The EFN now first verifies
the Target Protocol Address of the ARPs from the Gateway and then forwards
them to the Host for more processing. The Host load of unnecessary ARPs is
thus reduced. This feature is enabled by default when the switching rule of the
switching domain is configured as ip_validation or virtual_mac.
The feature can be disabled by setting the switching domain parameter,
check_gateway_source_address
to
no
. The use of the command is
described in section 13.8.23 on page 141.
8.1.5 Configuration
Set an ‘uplink’ in ‘vlan’ . The ‘switching_rule’ is still set to ‘normal’ here.
As has been described above, a gateway may be defined for a switching
domain. Different switching domains may have different gateways.
The MAC address of the gateway is primarily used by the forced forwarding
function. Besides directly specifying a MAC address (option 1 below), the
gateway MAC address may also be retrieved with help of ARP (options 2 and
3).
The gateway is configured by setting the ‘gateway’ attribute in ‘vlan’ to one of
the following three alternatives:
1. In the form of a
MAC address
which completes the definition of the
gateway.
It is not necessary to retrieve the GW IP address for this option. Forced