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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.
If you reboot both VLT peers in BMP mode with static VLT LAGs, the DHCP server reply to the DHCP
discover offer may not be forwarded by the ToR to the correct node. To avoid this issue, configure the
VLT LAGs to the ToR and the ToR port channel to the VLT peers with LACP.
If supported by the ToR, enable the lacp-ungroup feature on the ToR using the lacp ungroup
member-independent port-channel command.
If the lacp-ungroup feature is not supported on the ToR, reboot the VLT peers one at a time. After
rebooting, verify that VLTi (ICL) is active before attempting DHCP connectivity.
Use the lacp ungroup member-independent command only if the system connects to nodes using
bare metal provisioning (BMP) to upgrade or boot from the network. Otherwise, when the member links
flap, the links become independent switch ports and forward the traffic even before LACP is formed on
that port.
Ensure that you configure all port channels as hybrid ports and as untagged members of a VLAN where
the LACP ungroup option is applicable.
BMP uses untagged dynamic host configuration protocol (DHCP) packets to communicate with the
DHCP server.
To disable this feature on VLT and port channels, use no lacp ungroup member-independent
{vlt | port-channel} command under the configuration mode.
Example
DellEMC(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.
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-specific. For command information about other platforms, see the relevant Dell
EMC Networking OS Command Line Reference Guide.
Version Description
9.10(0.1) Introduced on the S6010-ON and S4048T-ON.
9.10(0.0) Introduced on the S3148.
9.10(0.0) Introduced on the S6100–ON.
9.8(2.0) Introduced on the S3100 series.
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.
Virtual Link Trunking (VLT) 1661