Administrator Guide

in stacking mode. This is because CMC is not involved with the conguration of parameters when the Aggregator operates in either
of these modes, with the uplink interfaces being part of dierent LAG bundles.
After you restart the Aggregator, the 4-Port 10 GbE Ethernet modules or the 40GbE QSFP+ port that is split into four 10GbE SFP+
ports cannot be congured to be part of the same uplink LAG bundle that is set up with the uplink speed of 40 GbE. In such a
condition, you can perform a hot-swap of the 4-port 10 GbE Flex IO modules with a 2-port 40 GbE Flex IO module, which causes the
module to become a part of the LAG bundle that is set up with 40 GbE as the uplink speed without another reboot. The Aggregator
supports native 40 GbE mode for QSFP ports only in simple MUX mode and stacking mode of operation. In stacking mode, the base
40 GbE module ports are used for stacking and native 40 GbE uplink speed is enabled for only the QSFP+ ports on the optional 2-
Port 40-Gigabit Ethernet QSFP+ FlexIO modules.
The following table describes the various speeds in dierent Aggregator modes. If a 4x10G SFP+ or a 4x10BASE-T module is plugged
in and 40 GbE mode is congured, it is in error-disabled state.
Table 21. Speeds in Dierent Aggregator Modes
Module Type Standalone 10G
mode
Standalone 40G
Mode
Stacking 10G
Mode
Stacking 40G
mode
VLT 10G Mode VLT 40G Mode
Base module 10G 40G 40G (HiGig) 40G
(HiGig)
40G (Native) 40G
(Native)
Optional module
(2 40GbE)
10G 40G 10G 40G 10G 40G
Optional modules
(4 10GbE)
10G Error 10G Error 10G Error
FC module 10G 10G 10G 10G 10G 10G
To congure the uplink speed of the member interfaces in a LAG bundle to be 40 GbE Ethernet per second for the Aggregator that
operates in standalone, stacking, or VLT mode, perform the following steps:
Specify the uplink speed as 40 GbE. By default, the uplink speed of the LAG bundle is set as 10 GbE. You cannot congure the
uplink speed if the Aggregator operates in programmable MUX mode. The
stack-unit unit-number iom-mode
[stack | standalone | vlt]
40G command is available in the CMC interface and the CLI interface.
CONFIGURATION
stack-unit unit-number iom-mode [stack | standalone | vlt] 40G
You can use the show system stack-unit unit-number iom-uplink-speed command to view the uplink speed of the
LAG bundles congured on the Flex IO modules installed on the Aggregator. The value under the Boot-speed eld in the output of
the show system stack-unit command indicates the uplink speed that is currently eective on the LAG bundles, whereas the
value under the
Next-Boot eld indicates the uplink speed that is applicable for the LAG bundle after the next reboot of the switch.
Depending on the uplink speed congured, the fan-out setting is designed accordingly during the booting of the switch.
The following example displays the output of the show system stack-unit unit-number iom-uplink-speed
command with the Boot-speed eld contained in it:
Dell# show system stack-unit 0 iom-uplink-speed
Unit Boot-speed Next-Boot
------------------------------------------------
0 10G 40G
Stacking
193