DELL 3-DNS User Manual

Chapter 4

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Working with VLANs

A VLAN is a grouping of separate 3-DNS Controller networks that allows 
those networks to behave as if they were a single local area network, 
whether or not there is a direct ethernet connection between them.

The 3-DNS Controller offers several options that you can configure for a 

VLAN. These options are summarized in Table 4.1. 

Default VLAN configuration

By default, the Setup utility configures each interface on the 3-DNS 
Controller as a member of a VLAN. The 3-DNS Controller identifies the 
fastest interfaces, makes the lowest-numbered interface in that group a 
member of the VLAN external, and makes all remaining interfaces 
members of the VLAN internal. 

Create a default VLAN 
configuration

You can use the Setup utility to create a default VLAN configuration. 

Create, rename, or delete 
VLANs

You can create, rename, or delete a VLAN.

Configure packet access to 
VLANs

Through an option called tagging, you can direct packets from multiple VLANs to a 
specific 3-DNS interface, or direct traffic from a single VLAN to multiple interfaces.

Manage the L2 forwarding 
table

You can edit the L2 forwarding table to enter static MAC address assignments.

Create VLAN groups

You can create a VLAN group to allow layer 2 packet forwarding between VLANs.

Set VLAN security

You can set port lockdown by VLAN.

Set fail-safe timeouts

You can set a fail-safe timeout on a VLAN. You can use a fail-safe timeout to trigger 
fail-over in a redundant system.

Set self IP addresses

You can set one or more self IP addresses for VLANs. 

Set MAC masquerade

You can use the MAC masquerade to set up a media access control (MAC) address 
that is shared by a redundant system. 

Configure VLAN mirroring

You can configure the 3-DNS Controller to replicate packets received by a VLAN and 
send them to another VLAN or set of VLANs.