Configuration Guide User guide

644 FastIron Configuration Guide
53-1002494-02
VSRP
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.
NOTE
The Backups always use the value of the timer scale received from the Master, and the value from
the Master will be written in the configuration file.
To change the timer scale, enter a command such as the following at the global CONFIG level of the
CLI.
Brocade(config)# scale-timer 2
This command changes the scale to 2. All VSRP, VRRP, and VRRP-E 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.
Configuring authentication
If the interfaces on which you configure the VRID use authentication, the VSRP packets on those
interfaces also must use the same authentication. VSRP supports the following authentication
types:
• No authentication – The interfaces do not use authentication.
• Simple – The interfaces use a simple text-string as a password in packets sent on the
interface. If the interfaces use simple password authentication, the VRID configured on the
interfaces must use the same authentication type and the same password.
To configure a simple password, enter a command such as the following at the VLAN configuration
level.
Brocade(config-vlan-10)#vsrp auth-type simple-text-auth ourpword
This command configures the simple text password “ourpword”.
Timer Timer scale Timer value
Hello interval 1 1 second
20.5 seconds
Dead interval 1 3 seconds
21.5 seconds
Backup Hello interval 1 60 seconds
2 30 seconds
Hold-down interval 1 3 seconds
21.5 second