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Alteon OS Application Guide
Chapter 13: High Availability
23142C4911, January 2007
Virtual Router Deployment Considerations
Review the following issues described in this section to prevent network problems when
deploying virtual routers:
Assigning VRRP Virtual Router ID
Configuring the Switch for Tracking
Assigning VRRP Virtual Router ID
During the software upgrade process, VRRP virtual router IDs will be automatically assigned
if failover is enabled on the switch. When configuring virtual routers at any point after
upgrade, virtual router ID numbers (/cfg/l3/vrrp/vr
#/vrid) must be assigned. The
virtual router ID may be configured as any number between 1 and 255.
Configuring the Switch for Tracking
Tracking configuration largely depends on user preferences and network environment. Con-
sider the configuration shown in Figure 13-5 on page 228. Assume the following behavior on
the network:
Switch 1 is the master router upon initialization.
If switch 1 is the master and it has one fewer active servers than switch 2, then switch 1
remains the master.
This behavior is preferred because running one server down is less disruptive than bring-
ing a new master online and severing all active connections in the process.
If switch 1 is the master and it has two or more active servers fewer than switch 2, then
switch 2 becomes the master.
If switch 2 is the master, it remains the master even if servers are restored on switch 1 such
that it has one fewer or an equal number of servers.
If switch 2 is the master and it has one active server fewer than switch 1, then switch 1
becomes the master.