Dell PowerConnect B-FCXs, Configuration Manual

Page: 410 / 1494

368 PowerConnect B-Series FCX Configuration Guide
53-1002266-01
Virtual Switch Redundancy Protocol (VSRP)
10
Syntax: enable | disable
Configuring optional VSRP parameters
The following sections describe how to configure optional VSRP parameters.
Disabling or re-enabling VSRP
VSRP is enabled by default on Layer 2 Switches and Layer 3 Switches. On a Layer 3 Switch, if you
want to use VRRP or VRRPE for Layer 3 redundancy instead of VSRP, you need to disable VSRP first.
To do so, enter the following command at the global CONFIG level.
PowerConnect(config)#no router vsrp
router vsrp is disabled. All vsrp config data will be lost when writing to flash
To re-enable the protocol, enter the following command.
PowerConnect(config)#router vsrp
Syntax: [no] router vsrp
Since VRRP and VRRPE do not apply to Layer 2 Switches, there is no need to disable VSRP and
there is no command to do so. The protocol is always enabled.
Changing the timer scale
To achieve sub-second failover times, you can shorten the duration of all scale timers for VSRP,
VRRP, and VRRP-E by adjusting the timer scale. The
timer scale is a value used by the software to
calculate the timers. By default, the scale value is 1. If you increase the timer scale, each timer
value is divided by the scale value. Using the timer scale to adjust timer values enables you to
easily change all the timers while preserving the ratios among their values. Here is an example.
If you configure the device to receive its timer values from the Master, the Backup also receives the
timer scale value from the Master.
NOTE
The Backups always use the value of the timer scale received from the Master, regardless of whether
the timer values that are saved in the configuration are the values configured on the Backup or the
values received from the Master.
Timer Timer scale Timer value
Hello interval 1 1 second
2 0.5 seconds
Dead interval 1 3 seconds
2 1.5 seconds
Backup Hello interval 1 60 seconds
2 30 seconds
Hold-down interval 1 2 seconds
2 1 second