Reference Guide

8.3.19.0 Introduced on the S8420T.
8.3.12.0 Introduced on the S4810.
Usage
Information
To delay the system from bringing up the VLT port for a brief period to allow IGMP Snooping and Layer 3
routing protocols to converge, use the delay-restore parameter. Use this feature:
● after a VLT device is reloaded.
● if the Peer VLT device was up at the time the VLTi link failed to the time when it was restored.
Related
Commands
show vlt statistics — displays statistics on VLT operations.
lacp ungroup member-independent
Prevent possible loop during the bootup of a VLT peer switch or a device that accesses the VLT domain.
Z9500
Syntax
lacp ungroup member-independent {vlt | port-channel}
Parameters
port-channel Force all LACP port-channel members to become switchports.
vlt Force all VLT LACP members to become switchports.
Defaults Not configured.
Command Modes CONFIGURATION
Command
History
This guide is platform-specific. For command information about other platforms, refer to the relevant Dell
Networking OS Command Line Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
Version Description
9.5(0.1) Introduced on the Z9500.
9.2(0.0) Introduced on the M I/O Aggregator. This command is supported in Programmable-
Mux (PMUX) mode only.
9.0.2.0 Introduced on the S6000.
9.0.0.0 Introduced on the Z9000.
8.3.19.0 Introduced on the S4820T.
8.3.12.0 Added port-channel parameter on the S4810.
8.3.8.0 Introduced on the S4810.
Usage
Information
LACP on the 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.
On the S4810, during boot-up in a stacking configuration, the system must be able to reach the DHCP
server with the boot image and configuration image. During boot-up, 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 BMP mode. If switches are connected using LACP port-channels like the VLT peer
and Top of Rack (ToR), use the port-channel parameter on the ToR-side configuration to allow member
ports of an ungrouped LACP port-channel to inherit vlan membership of that port channel to ensure
untagged packets that are 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
command on a VLT port channel, depending on whether the port channel is VLT or non-VLT.
Virtual Link Trunking (VLT) 1397