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60.1 Introduction to MRPP
MRPP (Multi-layer Ring Protection Prot ocol), is a link layer protocol applied on Ethernet loop protection. It can
avoid broadcast storm caused by data loop on Ethernet ring, and restore communication among every node
on ring net work when the Ethernet ring has a break link. MRPP is the expansion of EAPS (Ethernet link
automatic protection protocol).
MRPP prot ocol is similar to STP protocol on function, MRPP has below characters, compare to STP protocol:
<1> MRPP specifically uses to Ethernet ring topology
<2> fast convergence, less than 1 s. ideally it can reac h 100-50 ms.
60.1.1 Conception Introduction
SWITCH A
Master
Node
SWITCH C
1. Control VLAN
Cont rol VLAN is a virtual VLAN, only used to identify MRPP protocol packet trans ferred in the link. To avoid
confusion with other configured VLAN, avoids configuring control VLAN ID to be the same with other
configured VLA N ID. The different MRPP ring should configure the different cont rol VLAN ID.
2. Ethernet Ring (MRPP Ring)
Ring link ed Ethernet network topology.
Each MRPP ring has two states.
Healt h state: The whole ring net work physical link is connected.
Break state: one or a few physical link break in ring network
Chapter 60 MRPP Configuration
SWITCH B
E1
E2
Ring 1
SWITCH D
Figure 60-1-1
SWITCH F
SWITCH E
Master Node
E1
SWITCH H
MRPP Sketch Map
60-1
SWITCH G
Ring 2
E2
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