Huawei quidway s7700 Configuration Manual page 558

Smart routing switch

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Quidway S7700 Smart Routing Switch

Configuration Guide - VPN

Figure 6-2 Exchange of LDP-PW packets

parameter match , VC up

AC/Tunnel state changed

The dynamic allocation of LDP-PW labels is performed in the receiving and sending directions.

On the basis of Martini, the dynamic PW adds the optional status parameter in the Mapping

packet and supports the Notification packet.

When the network is in the unstable state, the Notification packet can decrease the number of

packet exchanges.

For example, if an AC on a PE flaps, the Notification packet is sent to notify the AC status. After

receiving the packet, the peer does not dismantle the VC.

However, in the Martini mode, the Withdraw packet is sent repeatedly. Thus, the PW is set up

and dismantled repeatedly.

The process of tearing down a dynamic PW is described as follows:

Issue 01 (2011-07-15)

mpls l2vc 2.2.2.2 101

PWE3 supports Notification mode to negotiate PW state information. The Withdraw packet is compatible

with withdraw labels in PWE3. The negotiation of two ends of the PW determines the mode to be used.

shows the packet exchange during the process of tearing down a dynamic PW.

Huawei Proprietary and Confidential

mpls l2vc 1.1.1.1 101

parameter match , VC up

Notification

AC/Tunnel state changed

6 PWE3 Configuration