switches, CMCs, CMs, and home gateways (HGWs). The enlarged Layer 2 network
promotes higher requirements on the CMCs for processing VLANs.
l Some carriers deploy HGWs on the lower-layer of CMs. The HGWs add different VLAN
tags to packets based on service types. This requires that the CMCs support transparent
transmission of VLAN tags.
Values
VLAN classification based on service types on traditional telecom networks brings the following
business value points for carriers:
l Services are isolated, which narrows down the broadcast scope.
l Service types can be identified based on VLANs.
l Layer 2 networks can be managed based on VLANs.
l Forwarding paths can be selected on Layer 2 networks based on VLANs.
Typical Network Planning
NOTE
The VLAN tags used in the following section are for reference only.
Figure 15-4 VLAN tag transparent transmission (home access)
In the preceding network, IP addresses are allocated and service flows and VLAN tags are
processed as follows:
1. The PC, set top box (STB), HGW, and CM use dynamic IP addresses allocated by a
Dynamic Host Configuration Protocol (DHCP) server.
2. All packets sent by the PC and STB are untagged. The HGW adds VLAN tag 200 to STB
packets, adds VLAN tag 300 to HGW management packets (HGW Mg), and transparently
transmits high-speed Internet (HSI) service packets.
3. The CMC adds VLAN tag 100 to the HSI service packets and CM management packets
(CM Mg).
SmartAX MA5600T/MA5603T/MA5608T Multi-service
Access Module
Commissioning and Configuration Guide
15 OptiCable D-CMTS Configuration (MA5633 Working as
a Remote Extended Frame)
Issue 01 (2014-04-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
1533
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