Administrator Guide

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 VLT, are not brought up
until the VLT domain is recognized on the access device.
During boot-up in a stacking conguration, the system must be able to reach the DHCP server with the boot
image and conguration image. To receive an oer on static LAGs between switches, only untagged DHCP
requests are sent to the DHCP server. Congure 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 conguration 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 congurations, 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, congure 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.
Parameters
value Enter the timeout value (in seconds). The range is from 1 to 1200. The default is 150.
Command Modes VLT DOMAIN (conf-vlt-domain)
Command History
This guide is platform-specic. 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.
1686 Virtual Link Trunking (VLT)