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55.1 Introduction to MRPP
MRPP (Multi-layer Ring Protection Protocol), 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 network when the Ethernet ring has a break link. MRPP is the expansion of EAPS (Ethernet link
automatic protection protocol).
MRPP protocol 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 reach 100-50 ms.
55.1.1 Conception Introduction
SWITCH A
Master
Node
SWITCH C
1. Control VLAN
Control VLAN is a virtual VLAN, only used to identify MRPP protocol packet transferred in the link. To avoid
confusion with other configured VLAN, avoids configuring control VLAN ID to be the same with other
configured VLAN ID. The different MRPP ring should configure the different control VLAN ID.
2. Ethernet Ring (MRPP Ring)
Ring linked Ethernet network topology.
Each MRPP ring has two states.
Health state: The whole ring net work physical link is connected.
Chapter 55 MRPP Configuration
SWITCH B
E1
E2
Ring 1
SWITCH D
Figure 55-1: MRPP Sketch Map
SWITCH F
SWITCH E
Master Node
E1
SWITCH H
55-12
SWITCH G
Ring 2
E2
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