Brocade Communications Systems Layer 3 Routing Configuration ICX 6650 - Manual (Page 459)

Brocade ICX 6650 Layer 3 Routing Configuration Guide 441
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Additional VRRP and VRRP-E parameter configuration
If you configure the device to receive its timer values from the Master, the Backup also receives the
timer scale value from the Master.
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 variable specifies the multiplier. You can specify a timer scale from 1 through 10.
However, Brocade recommends the timer scale of 1 or 2 for VRRP and VRRP-E.
NOTE
Be cautious when configuring the scale-timer command in a VRRP or VRRP-E scaled environment.
VSRP, VRRP, and VRRP-E are time-sensitive protocols and system behavior cannot be predicted
when the timers are scaled.
VRRP-E slow start timer
In a VRRP-E configuration, if a Master router goes down, the Backup router with the highest priority
takes over after expiration of the dead interval. When the original Master router comes back up
again, it takes over from the Backup router (which became the Master router when the original
Master router went down). By default, this transition from Backup back to Master takes place
immediately. However, you can configure the VRRP-E slow start timer feature, which causes a
specified amount of time to elapse between the time the Master is restored and when it takes over
from the Backup. This interval allows time for OSPF convergence when the Master is restored.
To set the IPv4 VRRP-E slow start timer to 30 seconds, enter the following commands.
Brocade(config)#router vrrp-extended
Brocade(config-VRRP-E-router)#slow-start 30
To set the IPv6 VRRP-E slow start timer to 60 seconds, enter the following commands.
Brocade(config)#ipv6 router vrrp-extended
Brocade(config-ipv6-VRRP-E-router)#slow-start 60
Syntax: [no] slow-start seconds
The seconds variable specifies a value from 1 through 255.
If the Master subsequently comes back up again, the amount of time specified by the VRRP-E slow
start timer elapses (in the IPv4 example, 30 seconds) before the Master takes over from the
Backup.
Backup Hello interval 1 60 seconds
2 30 seconds
Hold-down interval 1 2 seconds
2 1 second
TABLE 80 Time scale values (Continued)
Timer Timer scale Timer value