Managing Serviceguard 12th Edition, March 2006

Understanding Serviceguard Hardware Configurations
Redundant Network Components
Chapter 240
NOTE You should verify that network traffic is not too high on the heartbeat/
data LAN. If traffic is too high, this LAN might not perform adequately
in transmitting heartbeats if the dedicated heartbeat LAN fails.
Providing Redundant FDDI Connections
FDDI is a high speed fiber optic interconnect medium. If you are using
FDDI, you can create a redundant configuration by using a star topology
to connect all the nodes to two concentrators, which are also connected to
two routers, which communicate with the world outside the cluster. In
this case, you use two FDDI cards in each node. The configuration is
shown in Figure 2-2. Note that the concentrators are connected together
using dual cables cross-connected Port A to Port B. The routers must be
configured to send all packets to both concentrators.
Figure 2-2 Redundant FDDI Configuration