Appendix C. Dual 24 Port (48 Ports) Mgmt Switch Ess Configuration - IBM Elastic Storage System 3200 Hardware Planning And Installation Manual

Appendix C. Dual 24 port (48 ports) MGMT switch ESS
configuration
This topic describes how to configure a pair of ECS4100-28T to be the ESS top of the rack (TOR) switches.
For more information about the port, see ECS4100-28T.
This is intended for IBM manufacturing but can be also used by field engineers if needed.
When the management TOR is part of an order, IBM will deliver two of these switches as part of that order.
The reason to deliver two instead of one is to keep similar number of ports available as with the 48 ports
switch option.
Logical overview
From a logical perspective, the switches would look like the following figure:
Figure 91. Logical view of two switches
The orange-colored cable shown in the figure must be connected between port 22 of the upper switch
and 21 of the lower switch as a part of the configuration. That cable works as inter-switch link (ISL)
between the two switches.
Ports definitions
The following are the ports definitions:
• Ports 1 through 12, named as MGM (FSP-BMC) in the green and yellow colors, are to be used for
management connections to EMS and I/O nodes. These ports are used for all ESS models, regardless
they have dual MAC ports (ESS 3200 and 3500) or not (ESS 5000). This is different from the previous
IBM provided TOR rack where each logical color network had dedicated ports. Green and yellow ports
share the same physical ports (1 through 12).
• Ports 13 through 20, named as FSP-BMC in the blue color, are to be used for systems that have
dedicated FSPBMC connections. These are POWER9 EMS (both C11-T2 and HMC1 ports) and ESS 5000
I/O nodes HMC1 ports.
• Ports 21 and 22, named as ISL in the orange color, are to be used for ISL between switches only. IBM
allows to extend this setup to more than two switches on a line topology, meaning the first and last
switch can only have one ISL connection to the following/previous switch. The switches that are not on
the edge of that line topology have both ISL ports used to their previous and following switch on the
line.
• Port 23, named as Unconfigured in the white color, is not used and is shut down. This port might be
used in the future.
• Port 24, named as Switch management in the red color, is to be used to access the management
functions of the switch. It is intended for customer switch management network and it is set up to get
an IP address via the DHCP protocol.
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