Users Guide

Parameters
vlt Force all VLT LACP members to become switchports.
port-channel Force all LACP port-channel members to become switchports.
Defaults Not configured.
Command Modes CONFIGURATION
Command
History
This guide is platform-specific. For command information about other platforms, see the relevant Dell
Networking OS Command Line Reference Guide.
Version Description
9.10(0.0) Introduced on the S6100–ON.
9.8(1.0) Introduced on the Z9100–ON.
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.7(0.0) Introduced on the S6000-ON.
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 VLT, are 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
boot image and configuration image. To receive an offer on static LAGs between switches, only untagged
DHCP requests are sent to the DHCP server. Configure the DHCP server to start in BMP mode.
If the switches are connected using LACP port-channels (for example, the VLT peer and top of rack
[ToR]), use the port-channel option on the ToR-side configuration to allow member ports of an
ungrouped LACP port-channel to inherit VLAN membership of that port channel. This ensures untagged
VLT peer device packets reach the DHCP server on the ToR.
To ungroup the VLT and port-channel configurations, use the no lacp ungroup member
independent command on a VLT port channel.
Example
Dell(conf)#lacp ungroup member-independent ?
port-channel LACP port-channel members become switchports
vlt All VLT LACP members become
switchports
multicast peer-routing timeout
To retain synced multicast routes or synced multicast outgoing interface (OIF) after a VLT peer node failure, configure the
timeout value for a VLT node.
Syntax
multicast peer-routing timeout value
To restore the default value, use the no multicast peer-routing timeout command.
1672 Virtual Link Trunking (VLT)