Rrpp Overview - 3Com 7757 Configuration Manual

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RRPP Overview

Basic Concepts of RRPP
RRPP C
n
This board is supported if you have the special order modules listed in "RRPP on
3Com Switch 7750 Family" on page 908.
The rapid ring protection protocol (RRPP) is a link layer protocol designed for
Ethernet rings. RRPP can prevent broadcast storm caused by data loops when the
Ethernet rings are healthy, and restore rapidly the communication paths between
nodes after a link is disconnected on the Ethernet ring network.
Compared with the Spanning Tree Protocol (STP), RRPP has the following
characteristics:
Dedicated to Ethernet ring topology
■
Fast response
■
Figure 250 RRPP networking
Master node
Transit node
Domain
A domain consists of switches with the same domain ID and control VLAN. A
domain can consist of multiple Ethernet rings, only one of which is the primary
ring and the others are subrings. The ring roles are determined by user
configuration. If there is only one Ethernet ring, you can configure the ring either
as a primary ring or as a subring without making any difference in application.
As shown in Figure 250, Domain 1 is an RRPP domain, which consists of Ethernet
ring 1 and ring 2. All the nodes on the Ethernet rings belong to the RRPP domain.
ONFIGURATION
Domain 1
Switch A Switch B
Port 1 Port 1
Port 2 Port 2
Ring 1
Port 2
Port 1
Port 1 Port 2
Switch C
Switch D
Assistant edge node
Edge node
Port 3
Master node
Ring 2
Switch E
Port 3