IBM 990 - Manual (Page 254)

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zSeries 990 Technical Guide
Ethernet only - two-path wiring scenario
The Ethernet only - two-path wiring scenario is not applicable to systems with FC 0075. This
scenario is included for those who may be reusing a previous Hardware Management
Console.
This Ethernet only wiring scenario, shown in Figure A-7, is also intended for enterprises that
currently have Ethernet wiring and do not want token ring wiring introduced into their
environment. The two-path scenario is included to provide the possibility of a second,
separate, and redundant path to the Support Elements.
This wiring scenario requires that FC 3063 (a second Ethernet) be specified with the Support
Elements, and that the token ring feature not be ordered with the Hardware Management
Console, so that no token ring exists in either the Support Elements or in the Hardware
Management Console. The Ethernet features assume the use of 10/100 Mb Ethernet
facilities, requiring the use of CAT-5 Ethernet cabling. Since the Support Element Ethernet
only feature includes two Ethernet adapters, there are two Ethernet connections available.
For this scenario, both the Ethernet cables will be used.
The three communication protocols (SNA, TCP/IP and NetBios) used in Support Element to
Hardware Management Console communication are defined for both adapters in the PCMCIA
slots of the Support Elements.
It is necessary to connect the “top” Ethernet adapter cable to a customer-supplied local hub
capable of 10/100 Mb Ethernet rates. It is necessary to connect the Ethernet from at least one
local Hardware Management Console to the same hub as the Support Elements.
It is necessary to connect the “bottom” Ethernet adapter cable to a customer-supplied local
hub capable of 10/100 Mb Ethernet rates. This second adapter has to be assigned an
address on a separate subnet from the first adapter. Any Hardware Management Consoles
attached to either LAN is able to automatically discover the Support Elements, assuming that
the LAN network allows NetBios to flow between the devices (allowing NetBios to flow is a
requirement for local HMC-to-SE communication, but it is not a requirement for remote
HMC-to-SE communication).
Figure A-7 Ethernet only - two-path wiring scenario
zSeries 990
HMC
HMC
SE
SE