H3C Technologies H3C S12500 Series Switches - Manual (Page 249)

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• LeaveAll timer
On startup, an MRP participant starts its own LeaveAll timer. When the LeaveAll timer expires, MRP
sends out a LeaveAll message and restarts the LeaveAll timer. On receiving the LeaveAll message,
other participants re-register all the attributes and re-start their LeaveAll timer.
NOTE:
Though MRP participants throughout the network might be configured with different LeaveAll timers, an
MRP participant sends LeaveAll messages at the smallest interval among the neighboring participants'
LeaveAll timers. At the next startup, the LeaveAll timer of each participant randomly changes within a
certain range.
MRP protocol packet encapsulation format
Figure 86 MRP protocol packet encapsulation format
Figure 86 shows the format of an MRP protocol packet encapsulated in an IEEE 802.3 Ethernet frame.
Table 29 MRP protocol packet fields
Field Description
MRPDU MRP protocol data unit (MRPDU) encapsulated in the MRP protocol packet.
Protocol Version Protocol version, which is 0.
Message
Attribute message, which comprises the Attribute Type, Attribute Length, and Attribute List
fields.
End Mark End mark of the MRPDU or an attribute list field. This field is fixed at 0x00.
Attribute Type Attribute type, which is VID Vector specified by the value of 1.
Attribute Length Length of the FirstValue field, which is 2 as specified by MVRP.
Attribute List Attribute list, which comprises multiple attributes.
Ethernet frame
LeaveAll Event Number of Values
Vector Header First Value Vector
Attribute List Attribute Length Attribute Type
... Vector Attribute 1 Vector Attribute N End Mark
... Message N Message 1 Protocol Version End Mark
DA SA Length Type MRPDU