HP Serviceguard manual Vlan Configurations, What is VLAN?, Support for HP-UX Vlan

Figure 28 Aggregated Networking Ports

Both the Single and Dual ported LANs in the non-aggregated configuration have four LAN cards, each associated with a separate non-aggregated IP address and MAC address, and each with its own LAN name (lan0, lan1, lan2, lan3). When these ports are aggregated all four ports are associated with a single IP address and MAC address. In this example, the aggregated ports are collectively known as lan900, the name by which the aggregate is known on HP-UX 11i.

Various combinations of Ethernet card types (single or dual-ported) and aggregation groups are possible, but it is vitally important to remember that at least two physical cards must be used in any combination of APAs to avoid a single point of failure for heartbeat connections. HP-APA currently supports both automatic and manual configuration of link aggregates.

For information about implementing APA with Serviceguard, see the latest version of the HP Auto Port Aggregation (APA) Administrator's Guide and other APA documents posted at http:// www.hp.com/go/hpux-networking-docs.

VLAN Configurations

Virtual LAN configuration using HP-UX VLAN software is supported in Serviceguard clusters.

What is VLAN?

Virtual LAN (or VLAN) is a technology that allows logical grouping of network nodes, regardless of their physical locations.

VLAN can be used to divide a physical LAN into multiple logical LAN segments or broadcast domains, helping to reduce broadcast traffic, increase network performance and security, and improve manageability.

Multiple VLAN interfaces, each with its own IP address, can be configured from a physical LAN interface; these VLAN interfaces appear to applications as ordinary network interfaces (NICs). See Using HP-UX VLAN for more information on configuring VLAN interfaces.

Support for HP-UX VLAN

VLAN interfaces can be used as heartbeat as well as data networks in the cluster. The Network Manager monitors the health of VLAN interfaces configured in the cluster, and performs local and

78 Understanding Serviceguard Software Components