Virtual Router Deployment Considerations - Lenovo Flex System Fabric CN4093 Application Manual

Virtual Router Deployment Considerations

Assigning VRRP Virtual Router ID
Configuring the Switch for Tracking
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 (ports), interfaces (ifs), or
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CN4093 Application Guide for N/OS 8.2
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 commands to configure the virtual router ID:
CN4093(config)# router vrrp
CN4093(config­vrrp)# virtual­router 1 virtual­router­id <1‐255>
Tracking configuration largely depends on user preferences and network
environment. Consider the configuration shown in Figure 60 on page
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.
The user can implement this behavior by configuring the switch for tracking as
follows:
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.
475. Assume