Alteon Application Switch Operating System Application Guide
High Availability
528 Document ID: RDWR-ALOS-V2900_AG1302
Since both sites work independently, these virtual routers are not grouped, and priority is not
dynamically changed by tracking.
In an active-active configuration, the active switch supports all traffic or services. The backup switch
acts as a standby for services on the active master switch. If the master switch fails, the backup
switch takes over processing for all services. The backup switch may forward Layer 2 and Layer 3
traffic, as appropriate.
Alteon supports active-active redundancy in a shared or a non-shared environment.
• In a shared (or service-based) environment, two Alteon devices are used. Both devices support
active traffic but are configured so that they do not simultaneously support the same service.
Each Alteon is active for its own set of services, such as IP routing interfaces or load balancing
virtual server IP addresses, and acts as a standby for other services on the other Alteon. If
either Alteon fails, the remaining Alteon takes over processing for all services. The backup may
forward Layer 2 and Layer 3 traffic, as appropriate.
• In a non-shared (or switch-based) environment, two Alteon devices are used as VRRP routers,
implementing a virtual server router (VSR). The active switch supports all traffic or services. The
backup switch acts as a standby for services on the active master switch. If the master switch
fails, the backup switch takes over processing for all services. The backup switch may forward
Layer 2 and Layer 3 traffic, as appropriate. When both devices are healthy, only the master
responds to packets sent to the virtual server IP address. This is a very robust solution that
allows up to 100% of throughput.
This environment is suitable for configurations that cannot support sharing of interfaces at Layer
3 and Layer 4. This includes configurations where incoming packets are seen by more than one
device, such as instances where a hub is used to connect the devices.
Figure 78 - Active-Standby Configuration, page 522
shows an active-active configuration in a non-
shared environment. In this example, there are two VLANs, each with its own interface. There are
four virtual servers. Each virtual server runs a unique service.
Figure 79: Active-Active Configuration in Non-shared Environment
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