Managing Serviceguard 13th Edition, February 2007

Understanding Serviceguard Software Components
How the Network Manager Works
Chapter 3112
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) Support Guide and
other APA documents posted at docs.hp.com in the IO Cards and
Networking Software collection.
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 (5991-0617) 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 remote