Foundry Configuration Guide for the FESX, FSX, and FWSX
8 - 28 © Foundry Networks, Inc. December 2005
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:
FastIron SuperX Router(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:
FastIron SuperX Router(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 VSRP timers 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’s value is divided by the scale value. Using the timer scale to adjust VSRP
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.
To change the timer scale, enter a command such as the following at the global CONFIG level of the CLI:
FastIron SuperX Router(config)# scale-timer 2
This command changes the scale to 2. All VSRP timer values will be divided by 2.
Syntax: [no] scale-timer <num>
The <num> parameter specifies the multiplier. You can specify a timer scale from 1 – 10.
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
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