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• Untgged
(Access Link)
Frame Income
Frame Leave
Leave port is tagged
Leave port is untagged
Here pay attention to the explaining of "Access", "Trunk" and "Hybrid".
Access: Ports will strip the 802.1Q tag from all packets that out of those ports. If the packet doesn't have an 802.1Q
。
VLAN tag, the port will not alter the packet. Thus, all packets received by and forwarded by an untagging port will
have no 802.1Q VLAN information. Untagging is used to send packets from an 802.1Q-compliant network device to
a non-compliant network device.
Ports with "Access" mode belong to a single untagged VLAN.
Trunk: Ports with tagging enabled will put the VID number, priority and other VLAN information into the header of all
。
packets that out of those ports. If a packet has previously been tagged, the port will not alter the packet, thus
keeping the VLAN information intact. The VLAN information in the tag can then be used by other 802.1Q compliant
devices on the network to make packet forwarding decisions.
Hybrid: The port belongs to VLANs, and each VLAN is user-defined as tagged or untagged (full 802.1Q mode).
。
Ports will strip the 802.1Q tag from all packets that out of those ports.
Port Mode
Access Link
Trunk Link
Hybrid Link
packet-forwarding decisions.
Ports with untagging enabled will strip the 802.1Q tag from all packets that flow into those
ports. If the packet doesn't have an 802.1Q VLAN tag, the port will not alter the packet. Thus,
all packets received by and forwarded by an untagging port will have no 802.1Q VLAN
information. (Remember that the PVID is only used internally within the Switch). Untagging is
used to send packets from an 802.1Q-compliant network device to a non-compliant network
device.
Income Frame is tagged
Frame remains tagged
Tag is removed
VLAN Membership
Belongs to a single untagged VLAN
Allowed to belongs to multiple Tagged
VLANs at the same time
Allowed to belongs to multiple untagged
VLANs at the same time
User's Manual of ISW-1022M
Income Frame is untagged
Tag is inserted
Frame remain untagged
( Tag=PVID be removed)
(Tag=PVID or Original VID be remained)
Untagged by specify VID
72
Frame Leave
Untagged
Tagged
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