Users Guide

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Dell
You can remove the inactive VLANs that have no member ports using the following command:
Dell#configure
Dell(conf)#no interface vlan <vlan-id>
->vlan-id - Inactive VLAN with no member ports
You can remove the tagged VLANs using the no vlan tagged <VLAN-RANGE> command. You can remove the untagged VLANs using
the no vlan untagged command in the physical port/port-channel.
VLT Terminology
The following are key VLT terms.
• Virtual link trunk (VLT) — The combined port channel between an attached device and the VLT peer switches.
• VLT backup link — The backup link monitors the vitality of VLT peer switches. The backup link sends congurable, periodic keep alive
messages between the VLT peer switches.
• VLT interconnect (VLTi) — The link used to synchronize states between the VLT peer switches. Both ends must be on 10G or 40G
interfaces.
• VLT domain — This domain includes both the VLT peer devices, VLT interconnect, and all of the port channels in the VLT connected to
the attached devices. It is also associated to the conguration mode that you must use to assign VLT global parameters.
• VLT peer device — One of a pair of devices that are connected with the special port channel known as the VLT interconnect (VLTi).
VLT peer switches have independent management planes. A VLT interconnect between the VLT chassis maintains synchronization of
L2/L3 control planes across the two VLT peer switches. The VLT interconnect uses 10G or 40G user ports on the chassis.
A separate backup link maintains heartbeat messages across an out-of-band (OOB) management network. The backup link ensures that
node failure conditions are correctly detected and are not confused with failures of the VLT interconnect. VLT ensures that local trac on a
chassis does not traverse the VLTi and takes the shortest path to the destination via directly attached links.
Congure Virtual Link Trunking
VLT requires that you enable the feature and then congure the same VLT domain, backup link, and VLT interconnect on both peer
switches.
Important Points to Remember
• VLT port channel interfaces must be switch ports.
• Dell Networking strongly recommends that the VLTi (VLT interconnect) be a static LAG and that you disable LACP on the VLTi.
• If the lacp-ungroup feature is not supported on the ToR, reboot the VLT peers one at a time. After rebooting, verify that VLTi (ICL)
is active before attempting DHCP connectivity.
Conguration Notes
When you congure VLT, the following conditions apply.
• VLT domain
PMUX Mode of the IO Aggregator
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