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CRC
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Figure 2. Default VLAN settings
802.1Q Switch
Port 1
Port 2
PVID = 1
DA
SA
Incoming
untagged
Data
packet
CRC
Key
By default:
All ports are assigned PVID = 1
All external ports are untagged members of VLAN 1
All internal server ports are untagged members of VLAN 1
Note: The port numbers specified in these illustrations may not directly
correspond to the physical port configuration of your switch model.
When a VLAN is configured, ports are added as members of the VLAN, and the
ports are defined as either tagged or untagged (see Figure 3 through Figure
The default configuration settings for NE2552Es have all ports set as untagged
members of VLAN 1 with all ports configured as PVID = 1. In the default
configuration example shown in Figure
VLAN 1 by the default port VLAN identifier (PVID =1).
Figure 3 through Figure
Figure
3, untagged incoming packets are assigned directly to VLAN 2 (PVID = 2).
Port 5 is configured as a tagged member of VLAN 2, and port 7 is configured as an
untagged member of VLAN 2.
Note: The port assignments in the following figures are general examples and are
not meant to match any specific NE2552E.
Figure 3. Port‐based VLAN assignment
PVID = 2
Untagged packet
Data
SA
DA
B efore
VLAN 1
Port 3
Port 4
Port 5
CRC
Data
Outgoing
untagged packet
(unchanged)
SA
DA
2, all incoming packets are assigned to
6 illustrate generic examples of VLAN tagging. In
Port 1
Port 2
802.1Q Switch
Port 6
Port 7
Port 6
...
Port 7
BS45010A
Port 3
Tagged member
of VLAN 2
Port 8
Untagged member
of VLAN 2
Chapter 8: VLANs
6).
BS45011A
141
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