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1

FibeAir IP-10®

Proprietary and Confidential

Trunk VS. Access

 Agenda

1. VLAN TAG Attributes

2. Access Port

3. Trunk Port

4. Extracting frames out of a trunk

5. General Guidelines

Proprietary and Confidential2

6. EMS Trunk Configuration

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2

VLAN TAG Attributes

1. In L2 ETH switching, L2 traffic can be engineered using the VLAN TAG

attributes

2. L2 traffic is controlled by defining port membership: Access or Trunk

3. Together, port membership + L2 traffic engineering convert

connectionless to connection-oriented network

4. In such networks, services are better deployed and maintained

5. VLAN TAG attributes include:

Proprietary and Confidential3

• Priority Bits (3 bits)

5. Additional attributes may be used to engineer traffic:• MAC DA

• Port number  

 Access Port

• Access Port is a port which is aware of a single VLAN only

• Ingress traffic is expected to be Untagged, e.g. – no VLAN

information exists within the received Ethernet frame

• All frames that are received through this port are tagged with

default VLAN (VID + P bits)

• All frames that exit through this port towards customer devices are

untagged (VLAN is removed)

Proprietary and Confidential4

• Users can configure the L2 switch to assign different tagging

scenarios to different ports

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3

 Access Port

• Let us examine the Tagging / Untagging process of a L2 switch

Proprietary and Confidential5

DA SA Type Payload FCS

 Access Port – Tagging ingress frames

• Let us examine the Tagging / Untagging process of Port #1

Tagging

Port #8

Proprietary and Confidential6

DA SA Type Payload FCS

DA SA Type Payload FCS

VLAN TAG

Port #1

 Access Port:Untagged frame

Tagged frame

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4

 Access Port –Utagging frames towards customer interfacing ports

• When Tagged frame from Network is forwarded to Access port, the

VLAN Tag is removed

Untagging

Proprietary and Confidential7

DA SA Type Payload FCS

DA SA Type Payload FCS

VLAN TAG

Port #1Port #8

 Access Port: Untagged frame

Tagged frame

 Access Port – Tagging multiple ports

• The switch can individually tag multiple Access ports with same VID or

unique VID

Tagging

Port #8

Proprietary and Confidential8

DA SA Type Payload FCS

DA SA Type Payload FCS

DA SA Type Payload FCS

VLAN TAG = 10

Port #1 Port #2

 Access Ports: Untagged frames

DA SA Type Payload FCSVLAN TAG = 33

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6

Trunk & Access – Extracting frames out of a Trunk

• A certain VLAN can be extracted out of a Trunk via Access port assignedwith specific VLAN membership (Default VID)

Port #8: Trunk

Port #5: Access

DA SA Type Payload FCSVLAN TAG = 33

Proprietary and Confidential11

DA SA Type Payload FCSVLAN TAG = 10Port #2:

Trunk

Untagged frames

DA SA Type Payload FCSVLAN TAG = 33

DA SA Type Payload FCSVLAN TAG = 10

DA SA Type Payload FCSVLAN TAG = 33

General guidelines

• Access port can only receive untagged frames from customer device

• Access port can only transmit untagged frames towards customer device

• Access port supports single VLAN

• Access port can be connected to an Access port only

• Trunk port can only receive / transmit tagged frames

• Trunk port supports multiple VLANs

Proprietary and Confidential12

• Trunk port can be connected to a Trunk port only

• When configuring Access or Trunk port, membership needs to be defined

next (which VLANs are supported…)

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EMS Trunk Configuration

12

3

Proprietary and Confidential13

4

Thank You !

14

.