Addendum

vlt-peer-lag port-channel
Associate the port channel to the corresponding port channel in the VLT peer for the VLT connection to
an attached device.
Z-Series S4810 S4820T
Syntax
vlt-peer-lag port-channel id-number
Parameters
id-number Enter the respective vlt port-channel number of the peer
device.
Defaults Not configured.
Command
Modes
INTERFACE PORT-CHANNEL
Command
History
This guide is platform-specific. For command information about other platforms,
refer to the relevant FTOS Command Line Reference Guide.
The following is a list of the FTOS version history for this command.
Version 9.2(0.0) Introduced on the M I/O Aggregator. This command is
supported in Programmable-Mux (PMUX) mode only.
Version 9.0.0.0 Introduced on the Z9000.
Version
8.3.19.0
Introduced on the S4820T.
Version 8.3.8.0 Introduced on the S4810.
Overview
VLT allows physical links between two chassis to appear as a single virtual link to the network core or
other switches such as Edge, Access, or top-of-rack (ToR).
VLT reduces the role of spanning tree protocols (STPs) by allowing link aggregation group (LAG)
terminations on two separate distribution or core switches, and by supporting a loop-free topology. (To
prevent the initial loop that may occur prior to VLT being established, use a spanning tree protocol. After
VLT is established, you may use rapid spanning tree protocol (RSTP) to prevent loops from forming with
new links that are incorrectly connected and outside the VLT domain.)
VLT provides Layer 2 multipathing, creating redundancy through increased bandwidth, enabling multiple
parallel paths between nodes and load-balancing traffic where alternative paths exist.
Virtual link trunking offers the following benefits:
• Allows a single device to use a LAG across two upstream devices.
• Eliminates STP-blocked ports.
• Provides a loop-free topology.
• Uses all available uplink bandwidth.
454
Virtual Link Trunking (VLT)