HP Serviceguard A.11.20- Managing Serviceguard Twentieth Edition, August 2011

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