Huawei quidway s7700 - Configuring PW Switching

Applicable Environment
To support Multi-Hop, the PW switching is needed. MH-PW requires switching labesl at PW
label layer while forwarding packets.
PW switching must be configured on the S-PE with high performance and capability of setting
up large numbers of MPLS LDP sessions.
When configuring MH-PW, you need PW switching on the S-PE.
In the following cases, PW switching is required:
l Two PEs are not located in the same AS and no signaling or tunnel can be set up between
the two PEs. (If inter-AS tunnel is set up by the BGP labeled route, MH-PW is not required.)
l The signaling of two PEs differs from each other.
l If access device supports MPLS, but cannot set up large numbers of LDP session, you can
use User Facing Provider Edge (UFPE) as U-PE. And you can use the S-PE as the switching
node of LDP session, which is similar to signaling reflector.
Pre-configuration Tasks
Before configuring PW switching, complete the following tasks:
l Enabling MPLS L2VPN on the PEs
l 6.4 Configuring a Static PW on U-PEs if the PW switching is between two static PWs
l 6.5 Configuring a Dynamic PW on U-PEs if the PW switching is between two dynamic
PWs
Data Preparation
To configure PW switching, you need the following data.
No.
Data
1 IP address and VC-ID of static PWs or dynamic PWs to-be-switch
2 Encapsulation type of L2VC
3 Sending label and receiving label of L2VPN if the PW to be switched is a static PW
4 The MTU values of the interfaces on the two ends of the PW if the PW to be switched
is a static PW
6.6.2 Configuring PW Switching
A switching PW can be any of three types, namely, dynamic switching PW, static switching
PW, and mixed switching PW.
Context
The PW switching has three modes:
Quidway S7700 Smart Routing Switch
Configuration Guide - VPN 6 PWE3 Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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