Networking Concepts

Network Interface and Link Types

•An FDDI interface can have only one link configured under it; however, a single link can reach a large number of nodes. FDDI/iX Network Link can support up to 1000 nodes. Up to four FDDI NIs can be active at a time per system.

•A Point-to-Point network interface can have up to 40 links configured under it. Point-to-Point links may be dial links, in which a modem attached to a node is used to transmit and receive data carried across telephone wires, or leased lines, in which data is sent over data-grade lines leased from a private carrier. Up to 11

Point-to-Point NI’s can be active at a time (one NI must be loopback) for a total of 12 NI’s per system..

•An X.25 network interface can have from one to 11 links configured, depending on the number of configured X.25 network interfaces on the node. (A single node can have up to 11 NIs and up to 11 X.25 links.) Each link can be connected to as many as 1,024 remote nodes, with communication allowed with as many as 256 nodes at the same time. Up to 11 X.25 NI’s can be active at a time (one NI must be loopback) for a total of 12 NI’s per system..

•A gateway half network interface can have only one link configured under it (the gateway half link). Links connecting two gateway halves can be only NS Point-to-Point 3000/iX Network links. Only one gateway half NI can be active at a time per system.

If more than one (non-loopback) network interface is configured on a node, the network portions of the IP addresses configured for the interfaces should differ to correspond to the multiple networks to which the node belongs.

Refer to “Software Configuration Maximums” at the end of this chapter for information on configuration path maximums.

Priority of Network Interfaces

If it is possible to reach a destination through more than one active NI, the network determines which NI to select according to the following priority:

Loopback 100VG-AnyLAN 100Base-T FDDI

LAN Token Ring X.25 Gateway Half

Point-to-Point (router)

If more than one NI of a given type is active, (for example, two X.25 NIs) the network will select the one that it finds first.

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HP E3000 MPE/IX, E3000/IX manual Priority of Network Interfaces
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E3000 MPE/IX, E3000/IX specifications

The HP E3000 series, particularly the E3000/IX and E3000 MPE/IX, represents a significant milestone in the evolution of business computing, developed by Hewlett-Packard (HP) during the late 1970s and early 1980s. These systems were designed to provide robust, reliable, and efficient operation for mid-sized businesses, leveraging the power of the MPE (Multi-Programming Executive) operating system.

One of the main features of the HP E3000 series is its multitasking capability. MPE/IX allows for multiple applications to run concurrently, maximizing the utilization of system resources. This is particularly beneficial for organizations that require simultaneous access to various business applications, ensuring enhanced productivity and efficiency.

The HP E3000/IX architecture is built on a powerful 16-bit or 32-bit microprocessor, enabling it to handle substantial workloads. The system architecture is known for its modular design, which allows for easy upgrades and customization. This flexibility is essential for businesses that need to adapt to changing demands without overhauling their entire computing infrastructure.

Another notable technology incorporated into the HP E3000 series is its support for a range of storage solutions. The E3000 systems were compatible with various disk drives, providing organizations with options for data storage that matched their performance and capacity requirements. Additionally, they featured advanced data management capabilities, such as built-in backup and recovery systems, ensuring that critical business information remained secure and accessible.

Beyond hardware capabilities, HP E3000/IX and MPE/IX systems provide extensive programming support. They included tools for developing custom applications, with support for languages such as COBOL, BASIC, and FORTRAN. This versatility made it easier for businesses to tailor their software solutions to their specific needs, enhancing operational effectiveness.

Networking capabilities were also a significant innovation of the E3000 series. The systems offered robust support for various networking protocols, allowing for seamless integration with other computing environments. This facilitated communication and collaboration within an organization, as well as with external partners and clients.

In summary, the HP E3000/IX and E3000 MPE/IX systems were pivotal in delivering reliable computing power to mid-sized enterprises. With their multitasking operating system, modular architecture, advanced data management, and programming support, these systems provided an adaptable and comprehensive solution for evolving business needs. The legacy of the E3000 series is evident in how it paved the way for modern enterprise computing, focusing on flexibility, scalability, and efficiency.
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