As shown in Figure 6-8, as for ASBR1 in the AS 100, ASBR2 is a CE. Similarly, as for ASBR2,
ASBR1 is a CE.
Option A is easy to implement. No inter-AS configuration is needed on the ASBRs. The
interfaces that connect the ASBR do not need to be configured with any IP addresses.
In Option A, the two directly-connected ASBRs use different links including physical and logical
links for each inter-AS VPN. The links work as ACs to connect the VPN. Thus, the performance
requirement on the PE devices is relatively high.
PWE3 Tracert
With the broad applications of PWE3, PWE3 is required to support related operations and
maintenance. PWE3 tracert is a type of a network maintenance tool developed to meet this
requirement.
PWs are classified into SH PWs and MH PWs based on different networking types. Similarly,
PWE3 tracert is classified into PWE3 SH tracecert and PWE3 MH tracert.
l Basic principle
– PWE3 SH Tracert
– As shown in Figure 6-9, CE1 and CE4 belong to VPN 1; CE2 and CE3 belong to
VPN 2; the LSP from PE1 to PE4 is PE1-P-PE4; the LSP from PE2 to PE3 is PE2-
P-PE3.
Figure 6-9 Networking diagram of PWE3 SH tracert
CE1 CE2
CE3
CE4
PE1
PE2
PE3
PE4
P
VPN1
VPN1
VPN2
VPN2
LSP1
LSP2
– On PE1, you can start PWE3 tracert of VPN 1 by using related commands. This
PWE3 tracert is the same as the LSP tracert in the public network, except that a PW
label is added to packets, and the remote PE checks whether the receiving PW label
and the VC ID are the same as those on the local end.
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.
548
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