Huawei quidway s7700 - Layer 2 Protocol Transparent Transmission Features Supported by the S7700

l Each site on a user network can receive Layer 2 protocol packets from other sites.
l Layer 2 protocol packets sent from a user network are not processed by CPUs of devices
on the backbone network.
l Layer 2 protocol packets of different user networks are separated from each other.
A Layer 2 protocol packet is transparently transmitted as follows:
l A user-side device on the backbone network replaces the multicast destination MAC
address of Layer 2 protocol packets with a specified multicast MAC address.
l Devices on the backbone network determine whether to add an outer VLAN tag to the
packet according to the transparent transmission mode.
l The egress device on the backbone network restores the original multicast destination MAC
address of the packet according to the mappings between multicast destination MAC
addresses and Layer 2 protocols. The egress device also determines whether to remove the
outer VLAN tag, and then forwards the packet to the user network.
11.2 Layer 2 Protocol Transparent Transmission Features
Supported by the S7700
This section describes the Layer 2 protocol transparent transmission features supported by the
S7700.
Based on application scenarios, the S7700 supports the following Layer 2 protocol transparent
transmission features:
l Interface-based Layer 2 protocol transparent transmission
l VLAN-based Layer 2 protocol transparent transmission
l QinQ-based Layer 2 protocol transparent transmission
Currently, the S7700 can transparently transmit packets of the following Layer 2 protocols:
l Spanning Tree Protocol (STP)
l Link Aggregation Control Protocol (LACP)
l Ethernet Operation, Administration, and Maintenance 802.3ah (EOAM3ah)
l Link Layer Discovery Protocol (LLDP)
l Generic VLAN Registration Protocol (GVRP)
l Generic Multicast Registration Protocol (GMRP)
l HUAWEI Group Management Protocol (HGMP)
l VLAN Trunking Protocol (VTP)
l Unidirectional Link Detection (UDLD)
l Port Aggregation Protocol (PAGP)
l Cisco Discovery Protocol (CDP)
l Per VLAN Spanning Tree Plus (PVST+)
l Dynamic Trunking Protocol (DTP)
l User-defined protocols
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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