RAD Data comm RIC-155 Manuel D’Utilisation

Appendix B  Traffic Separation 

RIC-155 Installation and Operation Manual 

B-4 

Port-Based/VLAN-Based Traffic Separation 

 

All VLAN information is kept in the VTU (VLAN Translation Unit) table. The bridge 
ports operate in the following internal modes: 
•  Secure – only frames with VIDs that are registered in the VTU table are 

forwarded according to the VTU rules. The management and host ports 
operate in the secure mode only. 

•  Fallback – untagged frames and tagged frames with VIDs that are not 

registered in the VTU table are forwarded according to the port-based 
procedures only. 

The internal port operation modes depend on the port access mode and 
forwarding mode of the bridge, as detailed in 

MNG Disabled 

Secure 

Secure 

Secure 

Data 

Fallback Fallback Fallback  Fallback 

Host 

Secure Secure Secure  Secure 

Uplink 

Disabled 

Fallback Fallback Fallback  Fallback 

The following diagrams illustrate how RIC-155 separates between the management 
and user traffic according to the port access mode and bridge port VLANs 
(management port VID is set to 1, data port VID is set to 2). Numbers 1 and 2 inside 
the bridge indicate the management and data frame routes inside the bridge. 

When the port access mode is set to None, the management port is disabled. 
Frames coming from the local data port can reach the local uplink port only, and 
remote data frames can reach the local data port only. Remote management 
frames are forwarded to the local host port only. 
In the None access mode, the host port checks the source port of the incoming 

frames and drops those that do not originate from the management port.