Virtual Router Deployment Considerations - IBM RackSwitch G8000 Application Manual

Virtual Router Deployment Considerations

© Copyright IBM Corp. 2011
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 must be assigned. The virtual router
ID may be configured as any number between 1 and 255. Use the following
command to configure the virtual router ID:
RS G8000(config)# router vrrp
RS G8000(config-vrrp)# virtual-router 1 virtual-router-id <1-255>
Configuring the Switch for Tracking
Tracking configuration largely depends on user preferences and network
environment. Consider the configuration shown in
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 bringing 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.
You can implement this behavior by configuring the switch for tracking as follows:
1. Set the priority for switch 1 to 101.
2. Leave the priority for switch 2 at the default value of 100.
3. On both switches, enable tracking based on ports, interfaces, or virtual routers.
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.
Figure 38 on page
Chapter 25. Virtual Router Redundancy Protocol
301. Assume
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