Tcp/ip explanation (version 2) notes / 3 link layer / 3.4 bridge and switch / 3.4.2 multiple registration protocol (MRP)

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3.4.2 802.1ak: Multi attribute registration protocol （Multiple Registration Protocol (MRP)）

Multi attribute registration protocol （Multiple Registration Protocol (MRP)） This paper provides a method in bridging LAN environment , A common way to register attributes between sites
[802.1ak-2007] Defined MRP Two special “ application ”, be called MVRP（ For registering virtual LAN ） and MMRP（ For registering groups MAC Address ）
MRP Replaced the early GARP frame ,MVRP and MMRP Replaced the old GVRP and GMRP agreement
These agreements were originally made by 802.1q Defined

Use MVRP, Once the terminal site is configured to VLAN member , This information will be transmitted to the switch to which it is connected , Then participate in the site VLAN The message spreads to other switches
This allows the switch to be based on the virtual LAN of the site ID Expand its filter table , And allows you to change the virtual LAN topology , Without passing STP Trigger recalculation of existing spanning trees
avoid STP Recalculation is from GVRP Migrate to MVRP One of the reasons

MMRP You can let the site register its pairs MAC Address （ Multicast address ） The interest of
The switch can use this information to establish the port that must transmit multicast traffic
Without such facilities , Switches will have to broadcast all multicast traffic , This can lead to unnecessary overhead
MMRP It's No 2 Layer protocol , With the first 3 Layer of IGMP and MLD Protocols and many switches support “ IGMP/MLD Listen （snooping） ” The functions are similar

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