Managing Serviceguard Eighteenth Edition, September 2010

Figure 3-17 Cluster After Local Network Switching
As the standby interface takes over, IP addresses will be switched to the hardware path
associated with the standby interface. The switch is transparent at the TCP/IP level.
All applications continue to run on their original nodes. During this time, IP traffic on
Node 1 will be delayed as the transfer occurs. However, the TCP/IP connections will
continue to be maintained and applications will continue to run. Control of the packages
on Node 1 is not affected.
NOTE: On Ethernet networks, Serviceguard supports local failover between network
interfaces configured with “Ethernet protocol” or between network interfaces configured
with “SNAP encapsulation within IEEE 802.3 protocol.” You cannot use both protocols
on the same interface, nor can you have a local failover between interfaces that are
using different protocols.
Another example of local switching is shown in Figure 3-18. In this case a failure
affecting segment 2 causes both nodes to switch to the LAN cards attached to segment
1.
How the Network Manager Works 95