H3C Technologies H3C WX5500E Series Access Controllers - Manual (Page 204)

193
Figure 59 MRP implementation
MVRP registers and deregisters VLAN attributes as follows:
• When a port receives the declaration of a VLAN attribute, the port registers the VLAN and joins the
VLAN.
• When a port receives the withdrawal of a VLAN attribute, the port deregisters the VLAN and leaves
the VLAN.
Figure 59 shows a simple MVRP implementation on an MSTI. In a network with multiple MSTIs, VLAN
registration and deregistration are performed on a per-MSTI basis.
MRP messages
MRP exchanges information among MRP participants by advertising MRP messages, including Join,
New, Leave, and LeaveAll. Join and New messages are declarations, and Leave and LeaveAll messages
are withdrawals.
• Join message
{
An MRP participant sends Join messages when it wishes to declare the attribute values
configured on it and receives Join messages from other MRP participants.
{
When receiving a Join message, an MRP participant sends a Join message to all participants
except the sender.
Join messages fall into the following types:
{
JoinEmpty—An MRP participant sends JoinEmpty messages to declare attribute values that it
has not registered. For example, when a static VLAN exists on a device, the attribute of the
VLAN on the device is not changed even if the device learns the VLAN again through MRP. In
this case, the Join message for the VLAN attribute is a JoinEmpty message, because the VLAN
attribute is not registered.
{
JoinIn—An MRP participant sends JoinIn messages to declare attribute values that it has
registered. For example, when the device learns a VLAN through MRP messages, and
dynamically creates the VLAN, the Join message for the VLAN attribute is a JoinIn message.
• New message
Similar to a Join message, a New message enables MRP participants to register attributes.
{
When the Multiple Spanning Tree Protocol (MSTP) topology changes, an MRP participant sends
New messages to declare the topology change.
{
On receiving a New message, an MRP participant sends a New message out of each port
except the receiving port.
• Leave message
{
An MRP participant sends Leave messages when it wishes other participants to deregister the
attributes that is has deregistered.