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Home > VLAN Switching > VLAN Switching Protocol
VLAN Switching Protocol
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May 01, 2025

Overview

Switching sources in a Just Add Power VLAN Switching system involves changing the group membership of the port - the VLAN - on the switch that the Decoder is connected to so it matches the VLAN of the Encoder to watch.

Concepts

An audio/video signal in a VLAN Switching system is distributed according to VLAN membership of the physical port on the switch. Audio and video always switch together, and there is only one active audio/video signal on any network cable at any time (excepting trunk or stack connections).

Each Encoder is connected to a port with a unique VLAN ID that distinguishes it from all other Encoders on the network.

The VLAN membership of the port of a Decoder is altered to match the VLAN ID of the Encoder it wants to watch.

Concepts: Switching

VLAN Switching is a 2-part process:

  1. Select the port(s) on the switch that the Decoder(s) is connected to
  2. Change the VLAN membership of the port(s) to match the VLAN ID of the Encoder to be watched

Concepts: Audio/Video Multicast IP

VLAN Switching uses the same multicast IP for all Encoders and Decoders

  • 239.92.0.0

Concepts: Standardized AMP

Advanced Matrix Programmer - AMP - configures supported switches and Just Add Power 3G or MaxColor devices to work with VLAN Switching.

AMP creates VLANS 100-201 for Just Add Power devices and configures them for a B Class IP Subnet: 172.27.0.0/16

Vlan 100:

Group membership for all devices.

  • Incoming communication only for Encoders. This group membership never changes.

  • Outgoing and incoming communication for Decoders. This group membership never changes.

Vlan 101:

Group membership for Encoder 1 and any Decoders watching Encoder 1.

  • Incoming and outgoing communication for only Encoder 1. This group membership never changes.

  • Incoming communication for any Decoders watching Encoder 1. This group membership changes when the Decoder is set to watch a different Encoder.

VLAN 102:

Group membership for Encoder 2 and any Decoders watching Encoder 2.

  • Incoming and outgoing communication for only Encoder 2. This group membership never changes.

  • Incoming communication for any Decoders watching Encoder 2. This group membership changes when the Decoder is set to watch a different Encoder.

VLAN 103:

Group membership for Encoder 3 and any Decoders watching Encoder 3.

  • Incoming and outgoing communication for only Encoder 3. This group membership never changes.

  • Incoming communication for any Decoders watching Encoder 3. This group membership changes when the Decoder is set to watch a different Encoder.

VLANs 104-201:

Continue sequentially like VLANs 101-103

Additionally each device is assigned a management IP that is used for Layer 3 Features - video wall, RS232/IR/CEC control of endpoints, Tiling Encoder layout control, on-screen display, Image Pull.

Concepts: JADConfig

Just Add Drivers Configuration - JADConfig - configures supported switches and Just Add Power 2G or 3G devices to work with VLAN Switching.

JADConfig creates VLANs 10-410 for Just Add Power devices and offers a range of IP schemes.

VLAN 10:

Group membership for all devices.

  • Incoming communication only for Encoders. This group membership never changes.

  • Outgoing and incoming communication for Decoders. This group membership never changes.

VLAN 11:

Group membership for Encoder 1 and any Decoders watching Encoder 1.

  • Incoming and outgoing communication for only Encoder 1. This group membership never changes.

  • Incoming communication for any Decoders watching Encoder 1. This group membership changes when the Decoder is set to watch a different Encoder.

VLAN 12:

Group membership for Encoder 2 and any Decoders watching Encoder 2.

  • Incoming and outgoing communication for only Encoder 2. This group membership never changes.

  • Incoming communication for any Decoders watching Encoder 2. This group membership changes when the Decoder is set to watch a different Encoder.

VLAN 13:

Group membership for Encoder 3 and any Decoders watching Encoder 3.

  • Incoming and outgoing communication for only Encoder 3. This group membership never changes.

  • Incoming communication for any Decoders watching Encoder 3. This group membership changes when the Decoder is set to watch a different Encoder.

VLANs 14-410:

Continue sequentially like VLANs 11-13

Additionally each device is assigned a management IP that is used for Layer 3 Features - video wall, RS232/IR/CEC control of endpoints, Tiling Encoder layout control, on-screen display, Image Pull, SwitchPlease.

Matrix Control

Matrix Control: AMP

Switching commands in AMP are sent to a Encoder or Decoder in the system. This means that matrix control commands in AMP do not depend on the switch model. Full information is available in the JPSW Matrix Control article.

Matrix Control: JADConfig Cisco Switch

For a Cisco SG300, change the Decoder in port B to watch the Encoder in VLAN X:

  1. config t
  2. interface giB
  3. switchport general allowed vlan remove 11-410
  4. switchport general allowed vlan add X untagged
  5. end

Example: Change the Decoder in port 28 to watch the Encoder in VLAN 14

  1. config
  2. interface gi28
  3. switchport general allowed vlan remove 11-410
  4. switchport general allowed vlan add 14 untagged
  5. end

Matrix Control: JADConfig Luxul Switch

For any supported Luxul switch, change the Decoder in stack A, port B to watch the Encoder in VLAN X:

  1. config
  2. interface gi A/B
  3. switchport hybrid allowed vlan 10,X
  4. end

Example: Change the Decoder in stack 2, port 14 to watch the Encoder in VLAN 12:

  1. config
  2. interface gi 2/14
  3. switchport hybrid allowed vlan 10,12
  4. end
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