Administrator Guide

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Virtual Link Trunking (VLT)
Virtual link trunking (VLT) allows physical links between two chassis to appear as a single virtual link to the
network core. VLT domain configuration is automatic and you must connect the base module ports for
VLT interconnect (VLTi) communication. In VLT mode, all LAGs are peer-LAG VLT enabled, so you do not
need to configure any VLT LAGs. If you change to VLT mode, reboot the I/O aggregator. VLT mode VLT
provides Layer 2 multipathing, creating redundancy through increased bandwidth, enabling multiple
parallel paths between nodes and load-balancing traffic where alternative paths exist.
The VLT commands described in this chapter are:
• show vlt backup-link
• show vlt brief
• show vlt detail
• show vlt role
• show vlt statistics
• stack-unit iom-mode
show vlt backup-link
Displays information on the backup link operation.
Syntax
show vlt backup-link
Default Not configured.
Command
Modes
EXEC
Command
History
Version 9.2.
(0.0)
Introduced on the DELL Poweredge I/O Aggregator Switch
IO Module.
Example
Dell# show vlt backup-link
VLT Backup Link
-----------------
Destination: 169.254.31.23
Peer HeartBeat status: Up
HeartBeat Timer Interval: 1
HeartBeat Timeout: 3
UDP Port: 34998
HeartBeat Messages Sent: 24
HeartBeat Messages Received: 25
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Virtual Link Trunking (VLT)