Huawei quidway s7700 - Page 620

Networking Requirements
As shown in Figure 11-8, CEs on user networks communicate with each other through PEs.
STP runs on user networks. CE1 and CE2 send STP packets with VLAN tag 100 to PEs; CE3
and CE4 send STP packets with VLAN tag 200 to PEs. In this scenario, configure QinQ-based
Layer 2 protocol transparent transmission to ensure that:
l All the devices in VLAN 100 participate in calculation of a spanning tree.
l All the devices in VLAN 200 participate in calculation of a spanning tree.
To save VLAN IDs on the public network, configure VLAN stacking on PEs to add outer VLAN
tag 10 to STP packets with VLAN tag 100 and VLAN tag 200. Then STP packets contain double
tags and are transparently transmitted on the backbone network.
In this example, PEs transparently transmit STP packets sent from user networks by replacing
the original multicast destination MAC address of STP packets with a specified multicast MAC
address. By default, the destination MAC address of STP packets is 0180-C200-0000.
Figure 11-8 Networking of QinQ-based Layer 2 protocol transparent transmission
VLAN100
VLAN100
VLAN200
VLAN200
CE1 CE2
CE3 CE4
PE1
PE2
GE1/0/0
GE1/0/0
GE1/0/1
GE1/0/2
GE1/0/0
GE1/0/0
GE1/0/1
GE1/0/2
GE1/0/0
GE1/0/0
Configuration Roadmap
The configuration roadmap is as follows:
1. Enable STP on the CEs.
2. Configure CEs to send STP packets with specified VLAN tags to PEs.
3. Configure VLAN-based Layer 2 protocol transparent transmission on PEs.
4. Configure QinQ (VLAN stacking) on PEs so that PEs add outer VLAN tag 10 to STP
packets sent from CEs.
Data Preparation
To complete the configuration, you need the following data:
l VLAN tags in STP packets sent from CEs to PEs
Quidway S7700 Smart Routing Switch
Configuration Guide - Ethernet 11 Layer 2 Protocol Transparent Transmission Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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