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Basic mode of operation
The MAC address in the header of a data packet is the criterion for forwarding received data
packets to the various BS2000 systems.
For this purpose the LAN controllers can receive data packets with different receiver
addresses and send them to different sender addresses.
The HNC uses two device addresses on the FC or ESCON connection: one for read
commands and one for write commands. Quasi full duplex mode is thus possible.
The device address is assigned a MAC address. The transferred data packets are not
processed further in the HNC. No special protocol is used between the BS2000 system and
the HNC.
Connection type ZASLAN
The HNC mainly transfers data packets between the BS2000 systems via LAN:
The LAN controller transfers the data packets to or from the HNC's central memory to
●
the LAN.
With the support of the HNC CPU the FC controller transfers the packets between the
●
memory and the FC connection of the BS2000 system.
Connection type LOCLAN
A special case that the HNC permits is communication between two BS2000 (guest)
systems which
are running on the same BS2000 server
●
are running on two different BS2000 servers which are connected to the same HNC
●
This communication (routing in the HNC) is implemented by the software module SLAN
(internal "shared LAN"). It establishes the connection between a BS2000 (guest) system
and a LAN on the HNC.
This permits guest systems of the same S server, for instance, to communicate via
LOCLAN.
14
Architecture
U41655-J-Z125-5-74
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