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Configuring Switching
11
SonicOS 5.7: Advanced Switching Feature Guide and Screencast Tutorial
Figure 7 illustrates a VLAN trunk with two trunk ports, bridging the Sales, Engineering, QA, and Finance
VLANs through the SonicWALL NSA 2400MX. Each remote VLAN is initially enabled on VLAN trunk
port X20, causing the creation of four virtual VLAN trunk interfaces. When these VLANs are also enabled
on trunk port X21, no new virtual interfaces are created.
Figure 7 VLAN Trunk Bridging Four VLANs Through the SonicWALL NSA 2400MX
VLAN trunking interoperates with Rapid Spanning Tree Protocol (RSTP), Link Aggregation and Port
Mirroring features. A VLAN trunk port can be mirrored, but cannot act as a mirror port itself. VLAN trunk
ports are used to pass traffic to other networking devices. By comparison, traffic arriving on a mirror port has
already been handled or sent to its destination, and the mirror port does not forward it again.
You cannot enable static port security on the VLAN trunk port. When using static port security, MAC
address objects for the trusted MAC addresses are bound to a port, and frames from other source addresses
are dropped. This is not supported on VLAN trunk ports in this release.
Ports configured as VLAN trunks cannot be used for any other function and are reserved for use in Layer 2
only. For example, you cannot configure an IP Address for the trunk ports.
When a Trunk VLAN interface has been configured on a particular trunk port, that trunk port cannot be
deleted until the VLAN interface is removed, even though the VLAN is enabled on multiple trunk ports.
See the following procedures:
• “Editing VLANs” on page 12
• “Adding a VLAN Trunk Port” on page 12
• “Enabling a VLAN on a Specific Trunk Port” on page 13
• “Deleting VLAN Trunk Ports” on page 13
2400MX
Network Security Appliance
Switch
Sales
Eng
Switch
Eng
QA
Sales QA Finance
VLAN
Trunk
VLAN
Trunk
Two Trunk Ports:
X20, X21
Four VLANS:
v100 - Sales
v200 - Engineering
v300 - QA
v400 - Finance
x20: v100
x20: v200
x20: v300
x20: v400
Finance
VLAN Trunk Interfaces:
Internet