ATM Configuration and Troubleshooting Guide

Configuring EMS High Availability over ATM
Configuring EMS HA-ATM for Local Recovery
Chapter 6 117
As another example, the secondary ELAN interfaces for primary
interface ela0 were configured in this order: eld0, elb0, and elc0.
Then, if ela0 fails, transfer to the secondary interfaces is tried as
shown in Figure 6-7 below:
Figure 6-7 Secondary ELAN Interfaces Configured “In Series”—Example 2
• Install two secondary ATM adapters and configure the secondary
ELAN interfaces to do “load balancing” for two primary ELAN
interfaces. An example of this—with one secondary ELAN interface
configured on each secondary adapter—is shown in Figure 6-8 below
(again, this example uses HP-UX 10.20 naming conventions):
Figure 6-8 Secondary ELAN Interfaces Configured “Load Balancing”
In this example, if the primary ELAN interfaces (ela0 and ela1) on
adapter atm0 fail, transfer is split between the two secondary ELAN
interfaces (elb0 and elc1), to provide a form of load balancing.
Primary
ela0
ELAN I/F
Secondary
elb0
ELAN I/F
Secondary
elc0
ELAN I/F
Secondary
eld0
ELAN I/F
atm0
Adapter
atm1
Adapter
atm2
Adapter
atm3
Adapter
1
2
3
4
Secondary
elb0
ELAN I/F
Secondary
elc1
ELAN I/F
atm0
Adapter
atm1
Adapter
atm2
Adapter
Primary
ela0
ELAN I/F
Primary
ela1
ELAN I/F
1
1
2
2