Administrator Guide

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.
• after the time when active VLTi link failed and restored.
Related
Commands
show vlt statistics — displays statistics on VLT operations.
lacp ungroup member-independent
Enables bare metal provisioning (BMP) booting of a top of rack (ToR) device through VLT nodes
C9000 Series
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
9.9(0.0) Introduced on the C9010.
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.
During BMP reload, the ToR device or the device connected to the VLT port-channel must reach the DHCP
server with the boot and configuration images. During boot-up, only untagged DHCP requests are sent to the
DHCP server to receive an offer. 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. The DHCP server must be configured to start in BMP mode. If switches are connected using
LACP port-channels like the VLT peer and 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.
Example
Dell(conf)#lacp ungroup member-independent ?
port-channel LACP port-channel members become switchports
vlt All VLT LACP members become
switchports
1670 Virtual Link Trunking (VLT)