Lantronix
SM12XPA Web User Guide
33848 Rev. A
Page
98
of
473
Periodic Transmission
: Enable or disable the Periodic Transmission feature for all MRP applications on this
switch port.
Buttons
Apply
: Click to save changes.
Reset
: Click to undo any changes made locally and revert to previously saved values.
Auto-refresh
: Check this box to refresh the page automatically every 3 seconds.
Refresh
: Click to manually refresh the page immediately.
MRP Timers
MRP uses the following timers to control message transmission:
Join timer
: The Join timer controls the transmission of Join messages. An MRP participant starts the Join timer
after sending a Join message to the peer participant. Before the Join timer expires, the participant does not
resend the Join message when these conditions exist:
•
The participant receives a JoinIn message from the peer participant.
•
The received JoinIn message has the same attributes as the sent Join message.
When both the Join timer and the Periodic timer expire, the participant resends the Join message.
Leave timer
: The Leave timer controls the deregistration of attributes. An MRP participant starts the Leave
timer in one of these conditions:
•
The participant receives a Leave message from its peer participant.
•
The participant receives or sends a LeaveAll message.
The MRP participant does not deregister the attributes in the Leave or LeaveAll message if the following
conditions exist:
•
The participant receives a Join message before the Leave timer expires.
•
The Join message includes the attributes that have been encapsulated in the Leave or LeaveAll message.
If the participant does not receive a Join message for these attributes before the Leave timer expires, MRP
deregisters the attributes.
LeaveAll timer
: After startup, an MRP participant starts its own LeaveAll timer. When the LeaveAll timer
expires, the MRP participant sends out a LeaveAll message and restarts the LeaveAll timer. Upon receiving the
LeaveAll message, other participants restart their LeaveAll timer. The value of the LeaveAll timer is randomly
selected between the LeaveAll timer and 1.5 times the LeaveAll timer. This mechanism provides these benefits:
•
Effectively reduces the number of LeaveAll messages in the network.
•
Prevents the LeaveAll timer of a particular participant from always expiring first.
Periodic timer
: The Periodic timer controls the transmission of MRP messages. An MRP participant starts its
own Periodic timer upon startup, and stores MRP messages to be sent before the Periodic timer expires. When
the Periodic timer expires, MRP sends stored MRP messages in as few MRP frames as possible and restarts the
Periodic timer. This mechanism reduces the number of MRP frames sent. You can enable or disable the Periodic
timer. When the Periodic timer is disabled, MRP does not periodically send MRP messages. Instead, an MRP
participant sends MRP messages when the LeaveAll timer expires, or the participant receives a LeaveAll message
from the peer participant.