16.3.2.3 Configuring DHCP Relay
This section describes how to configure Dynamic Host Configuration Protocol (DHCP) relay
so that cable modems (CMs) can obtain IP addresses in different network segments.
Prerequisites
The upper-layer router, DHCP server, and Trivial File Transfer Protocol (TFTP) server of an
optical line terminal (OLT) have been configured.
Data Plan
Table 16-16
DHCP data plan for the OLT
Item
Data
VLAN
ID of the CM management S-VLAN: 200; type of the VLAN:
smart
DHCP server group
parameters
IP address of the DHCP domain gateway for CMs: 10.10.224.1;
domain name: docsis
Table 16-17
Data plan for the upper-layer devices of the OLT
Item
IP Address
Layer 3 interfaces
connecting the router to
the OLT
l
Forwarding DHCP and broadband packets: 11.11.11.11
l
Forwarding CM management packets: 11.11.12.11
IP address of the DHCP
server
DHCP server assigning IP addresses to CMs and media terminal
adapters (MTAs): 192.168.10.10-192.168.10.11
Procedure
Step 1
Set the IP address of the VLAN Layer 3 interface.
huawei(config)#
vlan 100 smart
huawei(config)#
interface vlanif 100
huawei(config-if-vlanif100)#
ip address 10.10.224.1 255.255.255.0
//Set the IP
address of the DHCP domain gateway for CMs.
huawei(config-if-vlanif100)#
quit
Step 2
Configure the working mode of the DHCP relay to Layer 3 Option 60.
In DHCP Option 60 mode, a DHCP server group is selected according to the Option 60 domain
name in DHCP packets. Users in this mode are identified by domain information of packets,
which differentiates various service types in a VLAN. Ensure that the Option 60 domain name
and the DHCP server group bound to the Option 60 domain name are configured beforehand.
SmartAX MA5600T/MA5603T/MA5608T Multi-service
Access Module
Commissioning and Configuration Guide
16 OptiCable D-CMTS Configuration (MA5633 Working as
a Standalone NE)
Issue 01 (2014-04-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
1713
