Vpls Convergence Overview; Vpls Convergence Supported By The S7700 - Huawei quidway s7700 Configuration Manual

Quidway S7700 Smart Routing Switch
Configuration Guide - VPN

8.1 VPLS Convergence Overview

This section describes the principle and concepts of VPLS convergence.
The Ethernet switching technology has been mainly applied to the Local Area Network (LAN)
for a long time. With the advantages of expanding bandwidth, simplicity, and cost-efficiency,
the Ethernet technology is coming into wider use in the Metropolitan Area Network (MAN) and
Wide Area Network (WAN). The demands of customers and carriers also drive the rapid
development of the Metro Ethernet.
The advantages of the Metro Ethernet are as follows:
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Generally, in the VPLS convergence solution, an UPE is connected to two NPEs and VPLS
convergence is used to improve reliability. In the actual networking, the S7700 can be used as
the UPE and configured with the management VSI (mVSI).
Hierarchical VPLS (HVPLS) or VPLS connections are set up between different devices on the
Metro Ethernet. The Management Virtual Router Redundancy Protocol (mVRRP) is run
between core devices to determine whether a device is the master or the backup. The pseudo
wires (PWs) and attachment circuit (AC) interfaces between VSIs determine the master and the
backup by tracking the status of the mVRRP virtual router.
When mVRRP performs the switchover, the PW and AC interfaces between VSIs also perform
the switchover. Meanwhile, the VSI clears its own MAC address and learns the MAC address
of the new master device again.

8.2 VPLS Convergence Supported by the S7700

This section describes the VPLS convergence features supported by the S7700.
mVPLS
The VSI of the mVPLS is called the mVSI.
The conditions on which the mVSI and service VSI become Up are as follows:
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The mVSI can be bound to the service VSI. When receiving a gratuitous ARP packet, the mVSI
requests all the bound service VSIs to clear the MAC address entries and to learn the MAC
addresses again.
Issue 01 (2011-07-15)
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Service VSI: A service VSI becomes Up when at least two AC interfaces become Up or
one PW and one AC interface become Up.
mVSI: An mVSI becomes Up when at least one PW or AC interface becomes Up.
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