Huawei quidway s7700 - Page 567

changes on an edge device in a SEP segment. This helps an upper-layer network to detect
topology changes of a lower-layer network in time.
Networking Requirements
Generally, redundant links are used to connect an Ethernet switching network to an upper-layer
network to provide link backup and enhance network reliability. The use of redundant links,
however, may produce loops, causing broadcast storms and rendering the MAC address table
unstable. As a result, the communication quality deteriorates, and communication services may
even be interrupted. SEP can be deployed on the ring network to block redundant links and
unblock them if a link fault occurs.
Figure 10-14 Networking diagram for hybrid rings running SEP+RRPP
LSW1
LSW2
LSW3
Block Port(SEP)
NPE1 NPE2
Network
A
c
c
e
s
s
SEP
Segment1
RRPP
A
g
g
r
e
g
a
t
i
o
n
PE1
PE2
PE4
PE3
Primary Edge Node
Secondary Edge Node
GE1/0/1 GE1/0/1
GE1/0/1
GE1/0/1
GE1/0/1
GE1/0/1
GE1/0/1
GE1/0/2GE1/0/2
GE1/0/2
GE1/0/2
GE1/0/2
GE1/0/2
GE1/0/3
GE1/0/3 GE1/0/3
GE1/0/2
VLAN100
GE1/0/3
GE1/0/1
Block Port(RRPP)
CE
Quidway S7700 Smart Routing Switch
Configuration Guide - Ethernet 10 SEP Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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