Expand Configuration and Management Manual (G06.24+)

Configuring Expand-Over-SNA Lines
Expand Configuration and Management Manual—523347-008
11-5
Gigabit Ethernet ServerNet Adapter (GESA)
Gigabit Ethernet ServerNet Adapter (GESA)
The Gigabit Ethernet ServerNet adapter (GESA) is a single-port ServerNet adapter
that provides Gigabit connectivity between NonStop S-series systems and Ethernet
LANs. A GESA can be directly installed in slots 51 through 54 of an I/O enclosure and
slots 53 and 54 of a processor enclosure. The data transfer rate is limited to 10 Mbps
when the GESA is connected to a SWAN concentrator, but a data transfer rate of
10/100 Mbps is possible when the GESA is connected to a SWAN 2 concentrator. For
information about the GESA, refer to the LAN Configuration and Management Manual.
Gigabit Ethernet 4-Port ServerNet Adapter (G4SA)
The Gigabit Ethernet 4-port ServerNet adapter (G4SA) is a multiport ServerNet
adapter that provides Gigabit connectivity between NonStop S-series systems and
Ethernet LANs. A G4SA can be directly installed in slots 1 through 5 of an I/O adapter
module (IOAM). Since there are two IOAMs in an IOAM enclosure, a total of 10 G4SAs
can be installed in an enclosure. The G4SA replaces the Ethernet 4 ServerNet adapter
(E4SA), Fast Ethernet ServerNet adapter (FESA), and the Gigabit Ethernet ServerNet
adapter (GESA). The G4SA is the only LAN adapter supported for the IOAM
enclosure, and it cannot be installed in a NonStop S-series enclosure. The data
transfer rate is limited to 10 Mbps when the G4SA is connected to a SWAN
concentrator, but a data transfer rate of 10/100 Mbps is possible when the G4SA is
connected to a SWAN 2 concentrator. For information about the G4SA, refer to the
LAN Configuration and Management Manual.
ServerNet Wide Area Network (SWAN) Concentrator
The SWAN concentrator is a communications device that provides wide area network
(WAN) connections. HP recommends that you configure the SWAN concentrator in the
same processor pair as the Expand line-handler processes.
For information about the SWAN concentrator, refer to the WAN Subsystem
Configuration and Management Manual.
Topology Considerations
An Expand-over-SNA network must be configured as a logical fully connected mesh. In
a single-line path configuration, you configure one Expand-over-SNA line-handler
process for each destination node in the network. In a multi-CPU configuration, you
configure multiple Expand-over-SNA line-handler processes, usually in separate
processors, for each destination node in the network. In a multi-line path configuration,
you configure a path that consists of multiple lines between the source and destination
nodes.
In Figure 11-2, a single-line path is configured between node \A and node \C; a multi-
CPU path that consists of two path is configured between node \A and node \B; and a
multi-line path that consists of three lines is configured between node \B and node \C.