Reference Guide

1478 | Virtual Link Trunking (VLT)
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Defaults
Not configured.
Command Modes
CONFIGURATION
Usage
Information
LACP on VLT ports (on a VLT switch or access device), which are members of the virtual
link trunk, is not brought up until the VLT domain is recognized on the access device.
During boot-up in a stacking configuration, the system must be able to reach the DHCP server
with the image and configuration image. During bootup, only untagged DHCP requests are
sent to the DHCP server to receive an offer on static LAGs between switches. The DHCP
server must be configured to start in jumpstart mode. If switches are connected using LACP
port-channel like the VLT peer and ToR, use the
port-channel parameter on the TOR side of
the configuration to allow member ports of a completely un-grouped lacp port-channel to
inherit vlan membership of that port channel to ensure untagged packets sent by a VLT peer
device reach the DHCP server located on the TOR. To ungroup the vlt and port-channel
configurations, use the
no lacp ungroup member-independent vlt command on a VLT port
channel, depending on whether the port channel is VLT or non-VLT..
Command
History
peer-link
Configure the peer-link for VLT
Syntax
peer-link
Defaults
Not configured.
Command Modes
VLT DOMAIN
Command
History
peer-link port-channel
Configure the specified port channel as the chassis interconnect trunk between VLT peers in
the domain.
Syntax
peer-link port-channel port-channel-number {peer-down-vlan vlan id}
Parameters
Version 8.3.12.0 Added port-channel parameter.
Version 8.3.8.0 Introduced on S4810
Version 8.3.12.0 Introduced on S4810
port-channel-
number
Enter the port-channel number that will act as the interconnect trunk.
peer-down-vlan
vlan id
(Optional) Configure the VLAN that the VLT peer link uses when the VLT peer
is down.