Figure 7-6 Typical networking of a CE dual homed to the VPLS network
PE2 PE3
CE
PE1
VPLS
PW
Data flow 1
Data flow 2
As shown in Figure 7-6, a ring is formed by PE2, PE3, and the CE. Therefore, STP needs
to be enabled on the ring to prevent the loop.
After STP priorities are configured on PE2 and PE3, the root bridge is determined, the
redundant link on the CE side are blocked, and consequently, the loop is prevented.
NOTE
If the STP mode is MSTP, all PEs must be configured in the same MST region.
l Inter-AS VPLS network
As shown in Figure 7-7, PE1, Switch 1, and Switch 3, all belonging to AS 1, are fully
meshed in the VPLS network. PE2, Switch 2, and Switch 4, all belonging to AS 2, are fully
meshed in the VPLS network.
Figure 7-7 Typical networking of inter-AS VPLS
VPLS
ASBR
Switch1
ASBR
Switch2
Switch3
ASBR
Switch4
ASBR
AS1
AS2
VPLS
Data flow 2
PE1
PE2
Data flow 1
CE1 CE2
Quidway S7700 Smart Routing Switch
Configuration Guide - VPN 7 VPLS Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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