Huawei quidway s7700 Configuration Manual page 559

Quidway S7700 Smart Routing Switch
Configuration Guide - VPN
Figure 6-3 Process of tearing down an SH-PW
mpls l2vc 2.2.2.2 101
When PE1 does not forward packets sent from PE2 for a specific cause, that is, PE2 is no longer
a peer of PE2, PE1 sends a Withdraw message to PE2. After receiving the Withdraw message,
PE2 tears down the PW and responds with a Release message. After receiving the Release
message, PE1 releases the label and tears down the PW.
SH-PW and MH-PW
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Figure 6-4 Networking diagram of an SH-PWE3
CE1
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Issue 01 (2011-07-15)
Loopback1
1.1.1.1/32
PE1
VC Deletion
SH-PW
An SH-PW is set up between two U-PEs. That is, switching labels at PW label layer is not
required, as shown in Figure
U-PE1
MH-PW
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Loopback1
2.2.2.2/32
Withdraw
Release
Withdraw
6-4.
U-PE2
P
PW100
6 PWE3 Configuration
PE2
mpls l2vc 1.1.1.1 101
VC Deletion
CE2
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