Huawei HCIE certification technology advanced
MVRP multi-attribute registration agreement
MRP (Multiple Registration Protocol), as a carrier of attribute registration protocol, can be used to transfer attribute information. MVRP (Multiple VLAN Registration Protocol) is an application of MRP, used to publish and learn VLAN configuration information between devices. Through MVRP, devices in the LAN can automatically synchronize VLAN information, greatly reducing the VLAN configuration work of network administrators.
MVRP registration mode:
The VLAN configuration information transmitted by MVRP includes both static information manually configured locally and dynamic information from other devices. MVRP has three registration modes. Different registration modes treat dynamic VLAN differently.
Normal mode: MVRP entities in this mode allow dynamic VLAN registration or deregistration.
Fixed mode: The MVRP entity in this mode prohibits dynamic VLAN cancellation, and the received MVRP packets will be discarded. In other words, in this mode, the dynamic VLAN that the entity has registered will not be deregistered, and no new dynamic VLAN will be registered.
Forbidden mode: MVRP entities in this mode are prohibited from registering dynamic VLANs, and received MVRP packets will be discarded. At the same time, when the port’s MVRP registration mode is configured as Forbidden mode, all dynamic VLANs registered on the port except VLAN1 will be deleted.
Operating mechanism: One-way registration mechanism for VLAN attributes, two-way registration mechanism for VLAN attributes, one-way cancellation mechanism for VLAN attributes, and two-way cancellation mechanism for VLAN attributes.
Create a static VLAN 2 on Device A, and add the corresponding ports of Device B and Device C to VLAN 2 through one-way registration of VLAN attributes:
① After manually creating static VLAN 2 on Device A, Port 1 starts the Join timer and Hold timer. After the Hold timer expires, Device A sends the first JoinEmpty message to Device B. After the Join timer expires, the Hold timer is started again, and after the Hold timer expires, the second JoinEmpty message is sent.
② After receiving the first JoinEmpty message on Device B, dynamic VLAN 2 is created, and Port 2 receiving the JoinEmpty message is added to dynamic VLAN 2, and Port 3 is also informed to start the Join timer and Hold timer. Wait for the Hold timer to expire and send the first JoinEmpty message to Device C. After the Join timer expires, the Hold timer is started again. After the Hold timer expires, the second JoinEmpty message is sent. After receiving the second JoinEmpty message on Device B, Port 2 has been added to dynamic VLAN 2 and will not be processed.
③ After device C receives the first JoinEmpty message, it creates dynamic VLAN 2 and adds Port 4 that received the JoinEmpty message to dynamic VLAN 2. After receiving the second JoinEmpty message on Device C, Port 4 has been added to dynamic VLAN 2 and will not be processed.
④ Thereafter, whenever the Leaveall timer expires or a LeaveAll message is received, the device will restart the Leaveall timer, Join timer, Hold timer, and Leave timer. Device A’s Port 1 sends the first JoinEmpty message after the Hold timer expires, and then waits for the Join timer + Hold timer to send the second JoinEmpty message. Device B sends the JoinEmpty message to Device C.
Precautions:
① MVRP function can only be used in conjunction with STP, RSTP or MSTP, and cannot be used simultaneously with other Layer 2 network topology protocols (such as service loopback, PVST, RRPP and Smart Link) on one port. The sending and receiving of MVRP packets are not affected by STP/RSTP/MSTP blocked ports.
② It is recommended not to enable the remote port mirroring function and MVRP function at the same time, otherwise MVRP may register the remote mirroring VLAN to the wrong port, causing the mirroring destination port to receive many unnecessary packets.
③ After the MVRP function is enabled on the Layer 2 aggregate interface, dynamic VLAN registration or deregistration will be performed on the Layer 2 aggregate interface and all corresponding selected member ports at the same time.
④ If a Layer 2 Ethernet interface is added to an aggregation group, the MVRP related configuration on the interface before and after joining the aggregation group will not take effect. The MVRP configuration will only take effect after the interface exits the aggregation group.
⑤ After configuring MVRP compatible with GVRP, the MVRP function can only be used with STP or RSTP, but not with MSTP, otherwise it may cause abnormal network operation.
⑥ After configuring MVRP compatible with GVRP, it is recommended to turn off the Periodic timer. Otherwise, when the system is busy, it is easy to cause frequent changes of VLAN status.
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