Huawei AR530 Series - Applications

Figure 8-8 Networking diagram for a link fault on a SEP multi-instance network
Router1
Router2
Router4
Router3
CE2CE1
SEP
Segment2
Block Port
Primary Edge Port
Secondary Edge Port
Instance1:
VLAN 100~200
Instance2:
VLAN 201~400
SEP Segment1
P1
P2
After the link between Router3 and Router4 becomes faulty, Router3 starts to send LSAs to
instruct the other devices in SEP segment 2 to update their LSA databases, and the blocked
interface enters the Forwarding state. After the topology of SEP segment 2 is recalculated, the
data from VLAN 201 to VLAN 400 is transmitted along path Router3->Router1->Router2.
After the link between Router3 and Router4 recovers, the devices in SEP segment 2 perform
delayed preemption. After the preemption delay expires, P1 becomes the blocked interface again,
and sends LSAs to instruct the other devices in SEP segment 2 to update their LSA databases.
After the topology of SEP segment 2 is recalculated, the data from VLAN 201 to VLAN 400 is
transmitted along path Router3->Router4.
8.3 Applications
This section describes the applicable scenario of IPSec.
8.3.1 Open-Ring Networking
As shown in Figure 8-9, Router1 to Router5 form an open ring to access a Layer 2 network.
The two edge devices on the Layer 2 network, that is, Router1 and Router5, are not directly
connected. This networking is called open-ring networking. The open-ring networking is at the
access layer and is used to transparently transmit Layer 2 unicast and multicast services. When
SEP runs at the access layer, redundancy protection switching can be implemented at the access
layer and topology of the SEP segment can be displayed.
On an open-ring network, edge interfaces are located on the two edge devices in the SEP segment.
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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