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By Damon Watson | 13 September 2022 | 0 Comments

Types and Configuration of VLAN in V-SOL PON Network

VLAN is a technology used to implement virtual workgroups and limit broadcast domains. It is widely used on Layer 2 switching networks. VSOL PON access devices work at the second layer of the TCP/IP model. They achieve the access and isolation of a large number of users and the access, isolation, and forwarding of multiple types of services via VLAN. The VLANs running on VSOL PON devices are different from traditional VLANs.

 

Access devices have a large number of users and provide multiple services such as HSI and VolP. To enable the access devices to differentiate between different user services when they process user packets, service flows are defined at the access node.
 

 

Part I. What is VLAN?

 

The communication mode in the V-SOL access network VLAN is the same as that in the traditional VLAN. Packets are forwarded by querying the MAC address table.

what is VLAN
 

If a port is not found in the MAC address table, a packet on the port will be considered an unknown unicast and broadcast to all ports in the VLAN. If the mac and port are found in the VLAN, the packet will be forwarded.
 

 

Part II. Types and Configuration of VLAN in V-SOL PON Network

 

VSOL access network VLANs are the extended applications of traditional VLANs on common broadband access devices. Below are the types of VLAN in the V-SOL PON system.

 

1. There are 4 types of VLANs on ONU, including Tag, Trunk, Translation, and Transparent.

 

Tag
 

The ONU VLAN type "Tag" is not the same as the traditional packet with VLAN ID tag. It's the same as the VLAN access mode mentions in previous lessons.

VLAN Tag

The following describes how the ONU GE port with "Tag" mode processes packets.

 

When untag packet comes from the PC, ONU will default add a tag of the VLAN ID to the packet and forward it to OLT.

When the packet with the same VLAN Tag comes from OLT, ONU will remove the VLAN Tag of the packet and forward it to the PC.
Tag Configuration

 

Trunk
 

The ONU VLAN type "Trunk" is the same meaning as the traditional packet with multi VLAN ID tag. The following describes how to process packets.

VLAN Trunk

When untag packet comes from the PC, the switch will default add a tag of the VLAN ID to the packet and forward it to ONU. When ONU receives the packet from the switch, and the VLAN tag in the ONU GE port Trunk VLAN list, ONU will permit and forward the packet to OLT.

 

When the packet with the VLAN tag comes from OLT and the VLAN tag in the ONU GE port Trunk VLAN list, ONU will permit and forward the packet to switch. When switch receives the packet coming from ONU with the VLAN tag, then remove the VLAN tag and forward it to the PC.
Trunk Configuration

 

Transparent

 

The ONU VLAN type Transparent is the extended application of traditional VLANs. Here will introduce how to process packets.

VLAN Transparent

When untag packet comes from the PC, ONU will permit and forward the packet to OLT without VLAN ID.
When untag packet comes from OLT, ONU will permit and forward the packet to the PC without VLAN ID.
When packet with the VLAN tags comes from the switch, ONU will permit and forward the packet to OLT with VLAN IDs.
When packet with the VLAN tags comes from OLT, ONU will permit and forward the packet to switch with VLAN IDs.
Transparent Configuration

 

Translation

 

The ONU VLAN type Translation is the extended application of traditional VLANs. Let's see how to process packets.

VLAN Translation

When ONU received the packet from the switch, and the VLAN tag in the ONU GE port Translation VLAN list (old VLAN), ONU will translate it to the new VLAN and forward the packet to OLT.

 

When the packet with the VLAN tag comes from OLT, and the VLAN tag matches in the ONU GE port Translation VLAN list (new VLAN), ONU will translate to the old VLAN and forward the packet to the switch.
VLAN Configuration


 

2. There are 3 types of VLANs on OLT, which is the same as traditional VLANs including Access, Trunk, and Hybrid. Besides, there are 2 extended attributes involving Translation and QinQ.

 

OLT default all PON port and Uplink port in the Hybrid mode, and all PVID is 1.
OLT VLAN Types

PON system there are 2 extended attributes(QinQ and Translation) on OLT.

OLT VLAN Types
 

Translation
 

In some network environments, the OLT belongs to a private owner. The VLAN design will conflict with the service provider. So will use this VLAN translation to avoid that.

OLT VLAN Translation
 

When the packet with the VLAN tag comes from ONU and the VLAN tag match in the OLT PON port Translation VLAN list (Customer VLAN), OLT will translate to Service VLAN and forward the packet to Carrier Network.
 

When the packet with the VLAN tag comes from Carrier Network and the VLAN tag match in the OLT PON port Translation VLAN list(Services VLAN), OLT will translate to Customer VLAN and forward the packet to ONU.
OLT Translation Configuration

 

QinQ
 

A QinQ VLAN applies to a scenario when multiple ISPs use the same OLT to serve different users. The OLT forwards packets to different carriers according to the outer VLAN tag of the packets. Besides, the ISPs differentiate users and provide different services based on the inner VLAN tag of the packets.

VLAN QinQ
 

Packets with two VLAN tags traverse the backbone network of a service provider and reach the BRAS for authentication based on double VLAN tags.

 

User 1 sends an untagged packet to the ONU and ONU will add Cvlan 100 to OLT. When OLT receives packet with VLAN ID 100, the OLT adds Svlan 10(Cvlan 100 and Svlan 10) to ISP1.
 

ISP 1 sends double VLAN tags(Cvlan 100 and Svlan 10) packet to OLT. OLT remove Svlan 10 and send to ONU. When ONU receives the packet with VLAN ID 100, the ONU remove the Cvlan 100 to User 1.
QinQ Configuration

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