HP ProCurve 9304M Installation And Configuration Manual page 327

Configuring Metro Features
By default, each Backup saves the configured timer values to its startup-config file when you save the device's
configuration.
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:
HP9300(config-vlan-200-vrid-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. 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: An 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:
HP9300(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:
HP9300(config-vlan-200-vrid-1)# hello-interval 10
Syntax: [no] hello-interval <num>
The <num> parameter specifies the interval and can be from 1 – 84 seconds. The default is 1 second.
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.
Changing the Dead Interval
The Dead interval is the number of seconds a Backup waits for a Hello message from the Master before
determining that the Master is dead. The default is 3 seconds. This is three times the default Hello interval.
To change the Dead interval, enter a command such as the following at the configuration level for the VRID:
HP9300(config-vlan-200-vrid-1)# dead-interval 30
Syntax: [no] dead-interval <num>
The <num> parameter specifies the interval and can be from 1 – 84 seconds. The default is 3 seconds.
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