Huawei AR550 Series - Basic Concepts of SEP

SEP multi-instance is used to improve bandwidth efficiency and implement traffic load
balancing. SEP multi-instance allows two SEP segments to be configured on a physical ring.
Each SEP segment independently detects the completeness of the physical ring, blocks or
unblocks interfaces without affecting the other.
For details about SEP multi-instance, see 8.2.3 SEP Implementation Mechanisms.
8.2.2 Basic Concepts of SEP
Network Architecture of SEP
As shown in Figure 8-2, Router1 through Router5constitute a ring and are dual-homed to an
upper-layer a Layer 2 network. Two edge devices Router1 and Router5 are indirectly connected.
This networking is called open-ring networking. This access mode will cause a loop on the entire
network. To eliminate redundant links and ensure link connectivity, a mechanism used to prevent
loops is required.
Figure 8-2 shows the typical networking of an open ring running SEP. The following describes
the basic concepts of SEP.
Figure 8-2 Networking diagram of an open ring running SEP
Network
Router1
Router2
Router3
Router4
Router5
CE
No-Neighbor Primary Edge Port
Block Port
SEP
Segment
Network
Router1
Router2
Router3
Router4
Router5
CE
SEP
Segment
No-Neighbor Secondary Edge Port
Primary Edge Port
Secondary Edge Port
l SEP segment
A SEP segment consists of interconnected Layer 2 switching devices configured with the
same SEP segment ID and control VLAN ID. A SEP segment is the basic unit for SEP.
Huawei AR530&AR550 Series Industrial Switch Routers
Configuration Guide - Ethernet Switching
8 SEP Configuration
Issue 01 (2014-11-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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