Huawei quidway s7700 Configuration Manual page 688

Quidway S7700 Smart Routing Switch
Configuration Guide - VPN
Table 7-2 Processing tags carried in packets from the PW by the AC
AC Interface Type
Ethernet, GE, or XGE interface
VLANIF interfaces
VLAN stacking sub-interface
VLAN mapping sub-interface
Dot1q sub-interface
QinQ sub-interface
HVPLS
The above mentioned VPLS requires that the PE devices forward the Ethernet frame through
the fully-connected Ethernet PW. Thus, each PE must set up connections with the other PEs in
the same VPLS. If a VPLS has the PE devices of the number N, the VPLS will possess the
connection of N x (N - 1)/2. When the number of PEs increases, the VPLS connection increases
by squares of N.
The introduction of the Hierarchical Virtual Private LAN Service (HVPLS) resolves the problem
caused by excessive connections.
Figure 7-3
Issue 01 (2011-07-15)
NOTE
When VLL or VPLS is deployed on the F48CEAT, G48SFA, or G48TFA, if the PVID on the outbound
interface is the same as the VLAN ID of the packets, the interface removes the VLAN tag from the packet;
otherwise, the VLAN tag is not removed.
shows the HVPLS basic model.
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Processing of the Tag
Do not process the packet.
If an S tag is carried in a packet, rewrite the S
tag.
If no S tag is carried in a packet, add an S tag
in the packet.
If an S tag is carried in a packet, delete the S
tag from the packet.
If no S tag is carried in a packet, do not
process the packet.
If an S tag is carried in a packet, rewrite the S
tag.
If no S tag is carried in a packet, add an S tag
in the packet.
NOTE
The added or replaced tag is the VLAN tag on the
interface where VLAN mapping is not performed.
Do not process the packet.
Do not process the packet.
7 VPLS Configuration
673