Chapter 4: Web management
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NS3550-8T-2S Industrial Managed Switch User Manual
Two Separate 802.1Q VLANs
The diagram below shows how the industrial managed switch handles tagged and
untagged traffic flow for two VLANs. VLAN Group 2 and VLAN Group 3 are separated
VLANs. Each VLAN isolates network traffic, so only members of the VLAN receive
traffic from the same VLAN members. The table below describes the port configuration
of the industrial managed switches.
VLAN Group
VID
Untagged Members
Tagged Members
VLAN Group 1
1
Port-7 ~ Port-10
N/A
VLAN Group 2
2
Port-1, Port-2
Port-3
VLAN Group 3
3
Port-4, Port-5
Port-6
The scenario is described as follows:
Untagged packet entering VLAN 2
1. While [PC-1], an untagged packet, enters Port-1, the industrial managed switch will
tag it with a VLAN Tag=2. [PC-2] and [PC-3] will receive the packet through Port-2
and Port-3.
2. [PC-4],[PC-5] and [PC-6] received no packet.
3. While the packet leaves Port-2, it will be stripped away, becoming an untagged
packet.
4. While the packet leaves Port-3, it will remain as a tagged packet with VLAN Tag=2.