forward packets. The PE identifies the remote MAC addresses through the PW and the directly-
connected MAC addresses through the AC.
The MAC address learning has the following two modes:
l
Qualified: The PE identifies the MAC addresses according to the MAC addresses of the
Ethernet packets and the VLAN tags, that is, based on every VLAN of every VSI. In this
mode, every VLAN has its broadcast domain and independent MAC address range.
l
Unqualified: The PE identifies the MAC addresses according to MAC addresses of the
Ethernet packets, that is, based on every VSI. In this mode, all VLANs share a broadcast
domain and a MAC address range. The MAC address of a VLAN must be unique, and must
not have an overlapped address.
NOTE
Currently, the S7700 supports only the unqualified mode.
If the PE receives broadcast traffic sent by the local customer, the PE forwards it to all the other
AC side ports and to the PEs of the same VPLS.
If the PE receives the broadcast traffic sent by the remote PE, the PE forwards it to the directly-
connected customer devices of the same VPLS, instead of other PEs.
For the packet whose destination MAC address is a non-broadcast address, if the PE does not
identify this type of MAC address, then the PE broadcasts this packet.
Diagnosis of the MAC Address Learning Capability
VPLS MAC diagnostic tools can diagnose whether the MAC address learning capability of
devices in a VPLS domain is normal.
In S7700, the MAC address learning capability can be diagnosed through the following modes:
l
Populating an OAM MAC address into the local or peer device in the VPLS domain
l
Purging the OAM MAC address from the local or peer device in the VPLS domain
l
Populating a Register OAM MAC address into the local or peer device in the VPLS domain
vpn-config ping
The configuration and deployment of VPN services are complex. VPN services cannot be
successfully configured unless some configurations of peer PEs on the VPN are identical. For
example, on a Martini VPLS network, only when VSI-IDs of PE peers are identical, can VPLS
services be successfully configured. In the past, the configuration consistency is checked by
network maintenance engineers, which is error-prone when there are many VPN services on the
device.
As a solution, vpn-config ping is used to facilitate the configuration consistency check when
many VPN services exist on a PE. With vpn-config ping, a probe packet is sent from the VPN
requesting PE to search for VPN configuration of the requesting PE peer on a specified
responding PE; the responding PE is required to return a Reply packet carrying configuration
information to the requesting PE, which in turn displays the information to the user.
After arriving at PE1, configurations of the peer PE2, such as the VSI name, PW status, PW-
ID, VPN type, VSI management status, VSI operation status, MTU, number of CEs, VC type,
incoming label, and outgoing label, are displayed on the user terminal.
Quidway S7700 Smart Routing Switch
Configuration Guide - VPN
7 VPLS Configuration
Issue 01 (2011-07-15)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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