Ericsson EFN324, Руководство пользователя, Страница: 73 / 176

Glossary
based on the MAC address learned for that port. Packets received on the
uplink for unknown MAC addresses are broadcast (except for ports where
this feature is explicitly disabled).
3
When a switching domain has an uplink and a MAC FF address defined,
all packets received on the downlinks are sent to the uplink with the
destination address replaced by the MAC address of the gateway. All ports
connected to the switching domain are regarded as downlinks, except the
port marked as uplink. The downlink port is selected based on the MAC
address learned for that port. Packets received on the uplink for unknown
MAC addresses are broadcast (except for ports where this feature is
explicitly disabled).
4
With ip_validation enabled for a switching domain, all switching is based
on IP addresses. Defining an uplink is mandatory in this configuration
because the alternative would be for the EFN to learn all IP addresses in
use, not only at the downlink but in the network connected to the EFN. The
EFN keeps track of the IP addresses assigned to a given downlink port
using DHCP snooping and on a provision basis for static IP addresses
(static IP addresses are added per connection). The IP addresses learned
by the EFN are unique within the EFN, and not within a switching domain,
so this configuration does not allow duplicated IP addresses. All packets
received on the downlink ports are sent out on the uplink with no
destination address modifications.
5
With ip_validation enabled for a switching domain, all switching is based
on IP addresses. Defining an uplink is mandatory in this configuration
because the alternative would be for the EFN to learn all the IP addresses
in use, not only at the downlink, but also in the network connected to the
EFN. Furthermore, the definition of a gateway causes all packets received
on a downlink port to have the destination address replaced by the MAC
address of the gateway. The EFN keeps track of the IP addresses
assigned to a given downlink port using DHCP snooping and on a
provision basis for static IP addresses (static IP addresses are added per
connection). The IP addresses learned by the EFN are unique within the
EFN, and not within a switching domain, so this configuration does not
allow duplicated IP addresses.
6
With virtual_mac enabled, the MAC address of the user is encoded in all
packets sent on the uplink. Enabling virtual_mac implicitly enables
ip_validation and requires an uplink to be explicitly defined. All switching is
based on IP addresses.
7 With virtual_mac enabled, the MAC address of the user is encoded in all
packets sent on the uplink and similarly, with gateway defined, the