Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 599)

Multi-Service IronWare Switching Configuration Guide 569
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Displaying VSRP 2
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You can configure a Backup to instead save the current timer values received from the Master
when you save the configuration. Saving the current timer values instead of the configured ones
helps ensure consistent timer usage for all the VRID’s devices.
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 configure a Backup to save the VSRP timer values received from the Master instead of the timer
values configured on the Backup, enter the following command.
Brocade(config-vlan-200-vsrp-1)# save-current-values
Syntax: [no] save-current-values
Changing the Time-To-Live (TTL)
A VSRP Hello packet’s TTL specifies how many hops the packet can traverse before being dropped.
A hop can be a router or a Layer 2 Switch. You can specify from 1 – 255. The default TTL is 2. When
a VSRP device (Master or Backup) sends a VSRP HEllo packet, the device subtracts one from the
TTL. Thus, if the TTL is 2, the device that originates the Hello packet sends it out with a TTL of 1.
Each subsequent device that receives the packet also subtracts one from the packet’s TTL. When
the packet has a TTL of 1, the receiving device subtracts 1 and then drops the packet because the
TTL is zero.
NOTE
A Foundry MRP ring is considered to be a single hop, regardless of the number of nodes in the ring.
To change the TTL for a VRID, enter a command such as the following at the configuration level for
the VRID.
Brocade(config-vlan-200-vrid-1)# initial-ttl 5
Syntax: [no] initial-ttl num
The num parameter specifies the TTL and can be from 1 – 255. The default TTL is 2.
Changing the Hello interval
The Master periodically sends Hello messages to the Backups. To change the Hello interval, enter a
command such as the following at the configuration level for the VRID.
Brocade(config-vlan-200-vrid-1)# hello-interval 10
Syntax: [no] hello-interval num
The num parameter specifies the interval and can be from 1 – 28 units of 100 milliseconds. The
default is 1 unit of 100 ms.
NOTE
The default Dead interval is three times the Hello interval plus one-half second. Generally, if you
change the Hello interval, you also should change the Dead interval on the Backups.
NOTE
If you change the timer scale, the change affects the actual number of seconds.