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Configuration Guide - IP Service

S1720, S2700, S5700, and S6720 V200R012(C00 and C20)

This document describes the configurations of IP Service, including IP address, ARP, DHCP, DHCP policy VLAN, DNS, mDNS gateway, mDNS relay, UDP Helper, IP performance optimization, IPv6, DHCPv6, IPv6 DNS, IPv6 over IPv4 tunnel, and IPv4 over IPv6 tunnel.
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Example for Configuring a DHCP Server to Allocate IP Addresses to IP Phones

Example for Configuring a DHCP Server to Allocate IP Addresses to IP Phones

Networking Requirements

In Figure 3-20, IP phones send tagged voice packets. High-quality VoIP service voice data flows must be transmitted with a high priority to ensure call quality. To simplify management, the enterprise administrator requires that a DHCP server be deployed to allocate IP addresses to IP phones. Each IP phone also needs to dynamically obtain its startup configuration file configuration.ini from the FTP server. There are reachable routes between the FTP server and IP phones.

Figure 3-20  Networking diagram for configuring a DHCP server to allocate IP addresses to IP phones

Configuration Roadmap

  1. Configure a voice VLAN on the Switch to ensure that the Switch preferentially forwards voice packets.
  2. Configure the Switch as a DHCP server to dynamically allocate the voice VLAN, startup configuration file, and IP addresses to IP phones.

Procedure

  1. Create VLAN 10 and add GE0/0/1 and GE0/0/2 to VLAN 10.

    <HUAWEI> system-view
    [HUAWEI] sysname Switch
    [Switch] vlan 10
    [Switch-vlan10] quit
    [Switch] interface gigabitethernet 0/0/1
    [Switch-GigabitEthernet0/0/1] port link-type trunk
    [Switch-GigabitEthernet0/0/1] port trunk pvid vlan 10
    [Switch-GigabitEthernet0/0/1] port trunk allow-pass vlan 10
    [Switch-GigabitEthernet0/0/1] quit
    [Switch] interface gigabitethernet 0/0/2
    [Switch-GigabitEthernet0/0/2] port link-type trunk
    [Switch-GigabitEthernet0/0/2] port trunk pvid vlan 10
    [Switch-GigabitEthernet0/0/2] port trunk allow-pass vlan 10
    [Switch-GigabitEthernet0/0/2] quit

  2. Configure a voice VLAN to increase priority of voice packets.

    [Switch] interface gigabitethernet 0/0/1
    [Switch-GigabitEthernet0/0/1] voice-vlan 10 enable
    [Switch-GigabitEthernet0/0/1] voice-vlan remark-mode vlan
    [Switch-GigabitEthernet0/0/1] quit
    [Switch] interface gigabitethernet 0/0/2
    [Switch-GigabitEthernet0/0/2] voice-vlan 10 enable
    [Switch-GigabitEthernet0/0/2] voice-vlan remark-mode vlan
    [Switch-GigabitEthernet0/0/2] quit
    

    # Run the display voice-vlan 10 status command to check whether the configuration of the voice VLAN is correct.

    [Switch] display voice-vlan 10 status
    Voice VLAN Configurations:
    -----------------------------------------------------------
    Voice VLAN ID            : 10
    Voice VLAN status        : Enable
    Voice VLAN 8021p remark  : 6
    Voice VLAN dscp remark   : 46
    -----------------------------------------------------------
    Port Information:
    -------------------------------------------------------------------------------------------
    Port                       Add-Mode  Security-Mode  Legacy  PribyVLAN  Untag   Tag0
    -------------------------------------------------------------------------------------------
    GigabitEthernet0/0/2       Manual    Normal         Disable Enable     Disable Disable
    GigabitEthernet0/0/1       Manual    Normal         Disable Enable     Disable Disable
    NOTE:

    Only the S5720EI, S6720EI, and S6720S-EI support the Tag0 field.

  3. Configure the Switch as a DHCP server to dynamically allocate the voice VLAN, startup configuration file, and IP addresses to IP phones.

    # Enable the DHCP service.

    [Switch] dhcp enable

    # Configure VLANIF 10 to work in interface address pool mode. Configure the voice VLAN, startup configuration file, and allocatable IP address range in this address pool.

    [Switch] interface vlanif 10
    [Switch-Vlanif10] ip address 10.1.1.1 24
    [Switch-Vlanif10] dhcp select interface
    [Switch-Vlanif10] dhcp server bootfile configuration.ini
    [Switch-Vlanif10] dhcp server next-server 10.1.1.3
    [Switch-Vlanif10] dhcp server option184 voice-vlan 10
    [Switch-Vlanif10] quit

    The DHCP server is configured to allocate Option 184, which delivers the VLAN ID to IP phones so that packets sent by IP phones carry the same VLAN ID as that configured on the DHCP server. IP phone vendors may define different values for the Option field. For details about the options, see the usage guide of the IP phones.

  4. Verify the configuration.

    # Run the display ip pool interface vlanif10 command on the Switch to view the address pool configuration.

    [Switch] display ip pool interface vlanif10
      Pool-name      : Vlanif10
      Pool-No        : 0
      Lease          : 1 Days 0 Hours 0 Minutes
      Next-server    : 10.1.1.3
      Domain-name    : -
      Option-code    : 184
        Option-subcode : --
        Option-type    : hex
        Option-value   : 0302000A
      DNS-server0    : -
      NBNS-server0   : -
      Netbios-type   : -
      Position       : Interface
      Status         : Unlocked
      Gateway-0      : 10.1.1.1
      Network        : 10.1.1.0
      Mask           : 255.255.255.0
      VPN instance   : --
      Bootfile       : configuration.ini
      Logging        : Disable
      Conflicted address recycle interval: -
      Address Statistic: Total       :253       Used        :2                      
                         Idle        :251       Expired     :0                      
                         Conflict    :0         Disabled     :0                      
                                                                                    
     -----------------------------------------------------------------------------
      Network section
             Start           End     Total  Used  Idle(Expired)  Conflict  Disabled
     -----------------------------------------------------------------------------
          10.20.20.1    10.20.20.254   253     2        251(0)         0        0
     -----------------------------------------------------------------------------     

Configuration Files

Switch configuration file

#
sysname Switch
#
vlan batch 10
#
dhcp enable
#                                                                                                                                   
interface Vlanif10                                                                                                                 
 ip address 10.1.1.1 255.255.255.0                                                                                                
 dhcp select interface                                                                                                              
 dhcp server next-server 10.1.1.3                                                                                                 
 dhcp server option184 voice-vlan 10                                                                                                
 dhcp server bootfile configuration.ini 
#                                                                               
interface GigabitEthernet0/0/1                                                         
 port link-type trunk                                                          
 voice-vlan 10 enable    
 port trunk pvid vlan 10
 port trunk allow-pass vlan 10                                                           
#                                                                               
interface GigabitEthernet0/0/2                                                         
 port link-type trunk                                                          
 voice-vlan 10 enable    
 port trunk pvid vlan 10
 port trunk allow-pass vlan 10                                                           
#
return
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Updated: 2018-12-24

Document ID: EDOC1100038342

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