8.3 Applications. Huawei AR550 Series, AR530 Series

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Huawei AR530&AR550 Series Industrial Switch Routers

Configuration Guide - Ethernet Switching 8 SEP Configuration

Figure 8-8 Networking diagram for a link fault on a SEP multi-instance network

Router2

Router4

SEP

Segment2

SEP Segment1

Instance1:

VLAN 100~200

Router1 Router3

Instance2:

VLAN 201~400

CE1 CE2

Primary Edge Port

Secondary Edge Port

Block Port

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.

Issue 01 (2014-11-30) Huawei Proprietary and Confidential

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