H3C S6850 Series Configuration Manual page 206

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Propagates the Join message to all other participants on the device.
After receiving the Join message, other participants send the Join message to their respective peer
participants.
Join messages sent from a local participant to its peer participant include the following types:
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JoinEmpty—Declares an unregistered attribute. For example, when an MRP participant joins
an unregistered static VLAN, it sends a JoinEmpty message.
VLANs created manually and locally are called static VLANs. VLANs learned through MRP are
called dynamic VLANs.
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JoinIn—Declares a registered attribute. A JoinIn message is used in one of the following
situations:
An MRP participant joins an existing static VLAN and sends a JoinIn message after
registering the VLAN.
The MRP participant receives a Join message propagated by another participant on the
device and sends a JoinIn message after registering the VLAN.
New message
Similar to a Join message, a New message enables MRP participants to register attributes.
When the MSTP topology changes, an MRP participant sends a New message to the peer
participant to declare the topology change.
Upon receiving a New message from the peer participant, an MRP participant performs the following
tasks:
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Registers the attributes in the message.
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Propagates the New message to all other participants on the device.
After receiving the New message, other participants send the New message to their respective peer
participants.
Leave message
An MRP participant sends a Leave message to the peer participant when it wants the peer
participant to deregister attributes that it has deregistered.
When the peer participant receives the Leave message, it performs the following tasks:
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Deregisters the attribute in the Leave message.
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Propagates the Leave message to all other participants on the device.
After a participant on the device receives the Leave message, it determines whether to send the
Leave message to its peer participant depending on the attribute status on the device.
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If the VLAN in the Leave message is a dynamic VLAN not registered by any participants on the
device, both of the following events occur:
The VLAN is deleted on the device.
The participant sends the Leave message to its peer participant.
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If the VLAN in the Leave message is a static VLAN, the participant will not send the Leave
message to its peer participant.
LeaveAll message
Each MRP participant starts its LeaveAll timer when starting up. When the timer expires, the MRP
participant sends LeaveAll messages to the peer participant.
Upon sending or receiving a LeaveAll message, the local participant starts the Leave timer. The local
participant determines whether to send a Join message depending on its attribute status. A
participant can re-register the attributes in the received Join message before the Leave timer
expires.
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