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DES-7200 Configuration Guide Chapter 8 Private VLAN Configuration
8-2
Isolated Trunk Port, can be the member port of multiple ordinary VLANs and
PVLANs. In the isolated VLAN, the isolated trunk port can only communicate
with the promiscuous port; in the community VLAN, it can communicate with the
community ports in the same community VLAN and the promiscuous port; in the
ordinary VLAN, it follows the 802.1Q rule. The packets in the isolated VLAN
received on the isolated trunk port are allowed to be forwarded to the Trunk Port,
but the packets in the isolated VLAN received on the Trunk Port cannot be
forwarded to the isolated port.
The VID for the tagged packet forwarded from the promiscuous port to the the
isolated trunk port, is the VID for the secondary VLAN.
Community port, a port in the community VLAN, can communicate with other
community ports in the same community VLAN as well as the promiscuous port
in the primary VLAN. However, they cannot communicate with the community
ports in other community VLANs and isolated ports in the isolated VLANs.
The following list shows the packet forwarding relationship between various port
types:
Output Port
Input Port
Promiscuous
Port
Isolated
Port
Community
Port
Isolated Trunk
Port (In the
same VLAN)
Trunk Port
(In the
same
VLAN)
Promiscuous port √ √ √ √ √
Isolated Port √ X X X √
Community
Port
√ X √ √ √
Isolated Trunk
Port (In the same
VLAN)
√ X √ X √
Trunk Port (In the
same VLAN)
√ X √ X √
The following list shows the whether the VLAN TAG changes or not after the
packet forwarding between various port types: