Ericsson EFN324, User Manual, Page: 35 / 176

Glossary
Implementation­wise, the processing of BPDUs is done in the host
processor. BPDUs are forwarded to the host regardless of whether any
connection is defined from this port through a switching domain to the host
port.
6. Packet Type
The packets are classified as multicast or unicast. Packets are also
classified by the number of VLAN Tags in the packet. Untagged, single
and double VLAN Tags may be handled.
7. ARP, DHCP, IGMP
ARP, DHCP and IGMP control messages will, depending on the
configuration, be extracted for internal processing.
For instance, ARP messages are extracted for internal processing as soon
as a gateway is defined or a switching rule is set different from normal.
The EFN324 acts as ARP proxy for a specific switching domain.
In cases where these control messages are not extracted for internal
processing, they are switched in the same way as other packets.
8.
Connection to Switching Domain
After the introductory checks and classifications, the actual switching work
begins. The ingress port switching work consists of the search for an
existing connection from the ingress port to a switching domain. This
search is based on VLAN IDs. If the packet is untagged, there must be an
‘untagged connection’ on which the packet can be forwarded. If there is no
matching connection, the packet is discarded.
The configuration software ensures that there can be only one matching
connection. An error message appears whenever an operator tries to
define an ambiguous connection.
9.
Filtering
Filtering is an optional feature. It can only be configured from the CLI, and
not using SNMP. Filtering makes it possible to specify filter conditions for
the Ethernet destination and source addresses, as well as for the Ethernet
type field.
Filtering can be performed for unicast and broadcast packets only, not for
multicast packets.