Ericsson EFN324, User Manual, Page: 19 / 176

Glossary
Ethernet
Header
VLAN Data
Frame check
sequence (FCS)
Ethernet
Header
Outer
VLAN
Data
Frame check
sequence (FCS)
Inner
VLAN
tag
second_tag tag CLI notation:
CLI notation:
Single tag frame
Double tag frame
Figure 7 Definition of
tag
and
second_tag
for EFN324
In the CLI, the VLAN ID is called
tag
, the ethertype is called
first_ethertype
and the 3 bit priority field is called
p_tag
. Similarly, for
second tag the prefix <
second_
> is added.
As shown in Figure 7 on page 15, the EFN is inconsistent in relating the terms
Outer and Inner VLAN and the terms used in the CLI (
tag
,
second_tag
).
When one tag is present,
tag
denotes the Outer VLAN, but with two VLAN
tags,
tag
denotes the Inner VLAN.
The following figure illustrates the Ingress and Egress connections. Note that
to enable traffic in both directions, both the ingress and egress connections
must be configured for a switching domain.
EFN324
Egress
connection Ingress
connection
Service VLAN
Switching
Domain
Ingress
connection Egress
connection
Downstream
Upstream
Figure 8 Ingress and Egress Connections
On the ingress connection, the EFN324 will allow packets with the following
Tag Protocol Identifiers (Ethertype):