Radwin 2000+ SERIES User Manual - 15.4.1

RADWIN

2000+

Series

User

Manual

Release

4.2.40

15

‐

2

VLAN

Tagging

15.4

VLAN

Tagging

VLAN

tagging

enables

multiple

bridged

networks

to

transparently

share

the

same

physical

network

link

without

leakage

of

information

between

networks:

IEEE

802.1Q

is

used

as

the

encapsulation

protocol

to

implement

this

mechanism

over

Ethernet

networks.

15.4.1

QinQ

(Double

Tagging)

for

Service

Providers

QinQ

is

useful

for

Service

Providers,

allowing

them

to

use

VLANs

internally

in

their

“transport

network”

while

mixing

Ethernet

traffic

from

clients

that

are

already

VLAN

‐

tagged.

The

outer

tag

(representing

the

Provider

VLAN)

comes

first,

followed

by

the

inner

tag.

In

QinQ

the

EtherType

=

0x9100.

VLAN

tags

may

be

stacked

three

or

more

deep.

When

using

this

type

of

“Provider

Tagging”

you

should

keep

the

following

in

mind:

•

Under

Provider

Tagging,

the

system

double

‐

tags

egress

frames

towards

the

Provider’s

network.

The

system

adds

a

tag

with

a

VLAN

ID

and

EtherType

=

0x9100

to

all

frames,

as

configured

by

the

service

provider

(Provider

VLAN

ID).

•

The

system

always

adds

to

each

frame,

tags

with

VLAN

ID

and

EtherType

=

0x9100.

Therefore,

•

For

a

frame

without

a

tag

–

the

system

will

add

a

tag

with

VLAN

ID

and

EtherType

=

0x9100

so

the

frame

will

have

one

tag

•

For

a

frame

with

a

VLAN

tag

–

the

system

will

add

a

tag

with

VLAN

ID

and

EtherType

=

0x9100

so

the

frame

will

be

double

‐

tagged

For

a

frame

with

a

VLAN

tag

and

a

provider

tag

–

the

system

will

add

a

tag

with

VLAN

ID

and

EtherType

=

0x9100

so

the

frame

will

be

triple

‐

tagged

and

so

on.

At

the

egress

side,

the

RT

‐

B(HSU)

removes

the

QinQ

tag

with

EtherType

=

0x9100

no

matter

what

the

value

of

its

VLAN

ID.

15.4.2

VLAN

Untagging

VLAN

Untagging

means

the

removal

of

a

VLAN

or

a

Provider

tag.

15.4.3

Port

Functionality

In

a

2000+

link,

all

VLAN

activity

is

configured

and

supported

from

the

RT

‐

B(HSU).

To

this

end,

VLAN

functionality

is

supported

at

the

LAN

port

of

the

RT

‐

B(HSU).

The

RT

‐

B(HSU)

LAN

port

can

be

configured

to

handle

Ethernet

frames

at

the

ingress

direction

(where

frames

enter

the

RT

‐

B(HSU))

and

at

the

egress

direction

(where

frames

exit

the

RT

‐

B(HSU)).