– Dynamic-and-static switch: One of the PWs is set up with signaling, and the other one
is set up manually.
The preceding types of PW switching support the Control Word (CW) and Virtual Circuit
Connectivity Verification (VCCV). The CW and VCCV are sent from two U-PEs to the
S-PE through labels.
PW FRR
With the wide applications of PWE3, the requirement for the reliability of networks becomes
increasingly higher, especially for L2VPNs that carry real-time services such as VoIP or IPTV.
PW fast reroute (PW FRR) is one of the solutions to increasing the reliability of L2VPNs.
NOTE
S9300 does not support the dual-homed CE.
The PW FRR supported by the S9300 is used in the following networking:
l Asymmetrically connected CE devices: One CE is connected to a PE through an AC and
the other CE is dual-homed to PEs through two ACs, as shown in Figure 5-6.
Figure 5-6 Asymmetrically connected CEs
AC1
AC2
AC1
CE1
CE2
PE1
PE3
PE2
P2
P1
VPN backbone
Site1
Site2
Inter-AS PWE3
In actual networking, multiple sites of the VPN of a user may connect with multiple service
providers of different ASs or with multiple ASs of a service provider. The VPN is called inter-
AS VPN.
Inter-AS PWE3 has the following schemes:
l Inter-AS PWE3-Option A: Data of an inter-AS user is transmitted through dedicated
interfaces between ASBRs. The user exclusively occupies the link between the ASBRs.
l Inter-AS PWE3-Option B: The dynamic PW switching is performed between ASBRs.
l Inter-AS PWE3-Option C: The PEs advertise the VPNv4 routes through multi-hop MP-
EBGP.
The S9300 supports Inter-AS PWE3-Option A solutions. The following is the description:
l Inter-AS PWE3-OptionA
Quidway S9300 Terabit Routing Switch
Configuration Guide - VPN 5 PWE3 Configuration
Issue 03 (2009-08-20) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
5-7
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