INS_CNGE28FX4TX24MS(2,POE2/48)
04/30/18 PAGE 57
INSTALLATION AND OPERATION MANUAL
CNGE28FX4TX24MS(2,POE2/48)
TECH SUPPORT: 1.888.678.9427
Table 4-22. L2 Switching > 802.1Q VLAN > Port to VLAN
Item
Description
Port
Displays the assigned port to the entry.
Interface VLAN
Mode
Displays the assigned mode to the listed VLAN port.
Hybrid: Port hybrid model.
Access: Port hybrid model.
Trunk: Port hybrid model.
Tunnel: Port hybrid model.
Membership
Displays the assigned membership status of the port entry, options include: Forbidden,
Excluded Tagged or Untagged.
Apply
Click Apply to save the values and update the screen.
Port-VLAN Mapping
To access this page, click L2 Switching > 802.1Q VLAN > Port-VLAN Mapping.
The ensuing table for Port-VLAN Mapping Table settings are informational only: Port, Mode,
Administrative VLANs and Operational VLANs.
4.5.5 Q-in-Q
Q-in-Q is commonly referred as VLAN stacking in which VLANs are nested by adding two tags to
each frame instead of one. Network service provider and users both can use VLANs and makes it
possible to have more than the 4094 separate VLANs allowed by 802.1Q.
There are three ways in which a machine can be connected to a network carrying double-tagged
802.1ad traffic:
»
via a untagged port, where both inner and outer VLANs are handled by the switch or switches
(so the attached machine sees ordinary Ethernet frames);
»
via a single-tagged (tunnel) port, where the outer VLAN only is handled by the switch (so the
attached machine sees single-tagged 802.1Q VLAN frames); or
»
via a double-tagged (trunk) port, where both inner and outer VLANs are handled by the
attached machine (which sees double-tagged 802.1ad VLAN frames).
