HP 445946-001 - Manual (Page 177)

High availability
177
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 are assigned automatically 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 250.
Configuring the switch for tracking
Tracking configuration largely depends on user preferences and network environment. Consider the
configuration shown in the previous figure. Assume the following behavior on the network:
• Switch A is the master router upon initialization.
• If Switch A is the master and it has one fewer active servers than Switch B, then Switch A remains
the master.
• This behavior is preferred because running one server down is less disruptive than bringing a new
master online and severing all active connections in the process.
• If Switch A is the master and it has two or more active servers fewer than Switch B, then Switch B
becomes the master.
• If Switch B is the master, it remains the master even if servers are restored on Switch A such that it
has one fewer or an equal number of servers.
• If Switch B is the master and it has one active server fewer than Switch A, then Switch A becomes
the master.
The user can implement this behavior by configuring the switch for tracking as follows:
1. Set the priority for Switch A to 101.
2. Leave the priority for Switch B at the default value of 100.
3. On both switches, enable tracking based on ports (
ports
), interfaces (
ifs
), or virtual routers (
vr
).
You can choose any combination of tracking parameters, based on your network configuration.
NOTE: There is no shortcut to setting tracking parameters. The goals must first be set and the
outcomes of various configurations and scenarios analyzed to find settings that meet the goals.