配置VXLAN分布式网关作为DHCPv4 Relay示例（跨VPN）

2025-6-19

配置VXLAN分布式网关作为DHCPv4 Relay示例（跨VPN）

以跨VPN分布式VXLAN网关的典型应用场景为例，描述如何配置VXLAN分布式网关作为DHCPv4 Relay。

组网需求

如图1所示，某企业部署了分布式网关的VXLAN网络。现需要部署DHCP业务，以实现DHCP Server为不同网段的VM分配IP地址。其中Leaf1、Leaf2作为VXLAN网关并部署DHCP Relay，Leaf3与DHCP Server相连。DHCP Server和客户端VM属于不同的VPN。

图1 配置VXLAN分布式网关作为DHCPv4 Relay组网图
配置VXLAN分布式网关作为DHCPv4 Relay示例（跨VPN）

配置思路

采用如下的思路配置：

  1. 在Leaf1、Leaf2、Spine上以BGP EVPN方式部署分布式网关VXLAN。Leaf1、Leaf2作为VXLAN网关，Spine作为路由反射器。
  2. 在Leaf1、Leaf2、Leaf3上各配置一个用于DHCP业务的VPN实例。实现Leaf1、Leaf2上的DHCP VPN有至DHCP Server的路由。
  3. 在Leaf1、Leaf2上配置DHCP Relay。
  4. 配置DHCP Server。

数据准备

为完成此配置示例，需准备如下的数据：

  • 网络中设备互连的接口IP地址。
  • VM1所属的VLAN ID是VLAN 10，VM2所属的VLAN ID是VLAN 20。
  • 广播域BD ID分别是BD 10和BD 20。
  • VXLAN网络标识VNI ID分别是VNI 10和VNI 20。

配置注意事项

对于CE12800，除了操作步骤中的配置之外，可以根据需要额外执行如下命令：

  • 在系统视图下执行assign forward nvo3 f-linecard compatibility enable命令，用来防止在单板处于非增强模式时VXLAN流量不通。

    配置VXLAN分布式网关作为DHCPv4 Relay示例（跨VPN）

    在单板的互通模式为非增强模式时，如果VXLAN流量跨板转发，有可能出现VXLAN流量不通的问题。所以当单板的互通模式为非增强模式时必须配置assign forward nvo3 f-linecard compatibility enable命令才能正常使用VXLAN功能。

配置VXLAN举例的相关约束已经在操作步骤中加以说明。如果还想了解更多约束，请参见VXLAN配置注意事项。

操作步骤

  1. 配置路由协议。 

    # 配置Leaf1。Leaf2、Leaf3、Spine的配置与Leaf1配置类似，这里不再赘述。配置OSPF时，注意需要发布32位Loopback接口地址。

    <HUAWEI> system-view
[~HUAWEI] sysname Leaf1
[*HUAWEI] commit
[~Leaf1] interface loopback 1
[*Leaf1-LoopBack1] ip address 1.1.1.1 32
[*Leaf1-LoopBack1] quit
[*Leaf1] interface 10ge 1/0/1
[*Leaf1-10GE1/0/1] undo portswitch
[*Leaf1-10GE1/0/1] ip address 192.168.1.1 24
[*Leaf1-10GE1/0/1] quit
[*Leaf1] ospf
[*Leaf1-ospf-1] area 0
[*Leaf1-ospf-1-area-0.0.0.0] network 1.1.1.1 0.0.0.0
[*Leaf1-ospf-1-area-0.0.0.0] network 192.168.1.0 0.0.0.255
[*Leaf1-ospf-1-area-0.0.0.0] quit
[*Leaf1-ospf-1] quit
[*Leaf1] commit

    OSPF成功配置后，设备之间可通过OSPF协议发现对方的Loopback接口的IP地址，并能互相ping通。

     

  2. 配置VXLAN隧道模式并使能VXLAN的ACL扩展功能。 （仅CE12800需要配置此步骤） 

    # 配置Leaf1。Leaf2、Leaf3、Spine的配置与Leaf1配置类似，这里不再赘述。

    [~Leaf1] ip tunnel mode vxlan
[*Leaf1] assign forward nvo3 acl extend enable
[*Leaf1] commit
    配置VXLAN分布式网关作为DHCPv4 Relay示例（跨VPN）

    配置VXLAN隧道模式、使能VXLAN的ACL扩展功能后，需要保存配置并重启设备才能生效，您可以选择立即重启或完成所有配置后再重启。

     

  3. 分别在Leaf1、Leaf2上配置业务接入点。 

    # 配置Leaf1。

    [~Leaf1] bridge-domain 10
[*Leaf1-bd10] quit
[*Leaf1] interface 10ge 1/0/2.1 mode l2
[*Leaf1-10GE1/0/2.1] encapsulation dot1q vid 10
[*Leaf1-10GE1/0/2.1] bridge-domain 10
[*Leaf1-10GE1/0/2.1] quit
[*Leaf1] commit

    Leaf2的配置与Leaf1配置类似，这里不再赘述。具体配置过程略，请参考配置文件。

     

  4. 使能EVPN作VXLAN控制平面功能。 
    # 配置Leaf1。

    [~Leaf1] evpn-overlay enable
[*Leaf1] commit

    Leaf2、Leaf3、Spine的配置与Leaf1配置类似，这里不再赘述。具体配置过程略，请参考配置文件。

     

  5. 在Leaf1、Leaf2、Leaf3上建立与Spine之间的BGP EVPN对等体关系。 
    # 在Leaf1上配置BGP EVPN对等体关系。

    [~Leaf1] bgp 100
[*Leaf1-bgp] peer 4.4.4.4 as-number 100
[*Leaf1-bgp] peer 4.4.4.4 connect-interface LoopBack1
[*Leaf1-bgp] l2vpn-family evpn
[*Leaf1-bgp-af-evpn] peer 4.4.4.4 enable
Warning: This operation will reset the peer session. Continue? [Y/N]: y
[*Leaf1-bgp-af-evpn] quit
[*Leaf1-bgp] quit
[*Leaf1] commit

    Leaf2、Leaf3的配置与Leaf1配置类似，这里不再赘述。具体配置过程略，请参考配置文件。

     

  6. 在Spine上建立与Leaf1、Leaf2、Leaf3之间的BGP EVPN对等体关系，并配置反射器功能，指定Leaf1、Leaf2、Leaf3作为反射器的客户机。 
    # 在Spine上配置BGP EVPN对等体关系。

    [~Spine] bgp 100
[*Spine-bgp] peer 1.1.1.1 as-number 100
[*Spine-bgp] peer 1.1.1.1 connect-interface LoopBack1
[*Spine-bgp] peer 2.2.2.2 as-number 100
[*Spine-bgp] peer 2.2.2.2 connect-interface LoopBack1
[*Spine-bgp] peer 3.3.3.3 as-number 100
[*Spine-bgp] peer 3.3.3.3 connect-interface LoopBack1
[*Spine-bgp] l2vpn-family evpn
[*Spine-bgp-af-evpn] peer 1.1.1.1 enable
Warning: This operation will reset the peer session. Continue? [Y/N]: y
[*Spine-bgp-af-evpn] peer 1.1.1.1 reflect-client
[*Spine-bgp-af-evpn] peer 2.2.2.2 enable
Warning: This operation will reset the peer session. Continue? [Y/N]: y
[*Spine-bgp-af-evpn] peer 2.2.2.2 reflect-client
[*Spine-bgp-af-evpn] peer 3.3.3.3 enable
Warning: This operation will reset the peer session. Continue? [Y/N]: y
[*Spine-bgp-af-evpn] peer 3.3.3.3 reflect-client
[*Spine-bgp-af-evpn] undo policy vpn-target
[*Spine-bgp-af-evpn] quit
[*Spine-bgp] quit
[*Spine] commit

     

  7. 在Leaf1和Leaf2上配置VPN实例和EVPN实例。  
    [~Leaf1] ip vpn-instance vpn1
[*Leaf1-vpn-instance-vpn1] vxlan vni 5010
[*Leaf1-vpn-instance-vpn1] ipv4-family
[*Leaf1-vpn-instance-vpn1-af-ipv4] route-distinguisher 20:1
[*Leaf1-vpn-instance-vpn1-af-ipv4] vpn-target 100:5010 evpn
[*Leaf1-vpn-instance-vpn1-af-ipv4] quit
[*Leaf1-vpn-instance-vpn1] quit
[*Leaf1] bridge-domain 10
[*Leaf1-bd10] vxlan vni 10
[*Leaf1-bd10] evpn
[*Leaf1-bd10-evpn] route-distinguisher 10:1
[*Leaf1-bd10-evpn] vpn-target 100:10
[*Leaf1-bd10-evpn] vpn-target 100:5010 export-extcommunity
[*Leaf1-bd10-evpn] quit
[*Leaf1-bd10] quit
[*Leaf1] commit

    Leaf2的配置与Leaf1配置类似，这里不再赘述。具体配置过程略，请参考配置文件。

     

  8. 分别在Leaf1、Leaf2上使能头端复制功能。 
    # 在Leaf1上使能头端复制功能。

    [~Leaf1] interface nve 1
[*Leaf1-Nve1] source 1.1.1.1
[*Leaf1-Nve1] vni 10 head-end peer-list protocol bgp
[*Leaf1-Nve1] quit
[*Leaf1] commit

    Leaf2的配置与Leaf1配置类似，这里不再赘述。具体配置过程略，请参考配置文件。

     

  9. 在Leaf1、Leaf2上配置VXLAN三层网关。 

    # 在Leaf1上配置VXLAN三层网关。

    [~Leaf1] interface vbdif10
[*Leaf1-Vbdif10] ip binding vpn-instance vpn1
[*Leaf1-Vbdif10] ip address 10.1.1.1 24
[*Leaf1-Vbdif10] vxlan anycast-gateway enable
[*Leaf1-Vbdif10] arp collect host enable
[*Leaf1-Vbdif10] quit
[*Leaf1] commit

    Leaf2的配置与Leaf1配置类似，这里不再赘述。具体配置过程略，请参考配置文件。

     

  10. 在Spine与Leaf1、Leaf2之间配置BGP对邻居发布IRB类型的路由。 

    # 配置Spine。

    [~Spine] bgp 100
[~Spine-bgp] l2vpn-family evpn
[~Spine-bgp-af-evpn] peer 1.1.1.1 advertise irb
[*Spine-bgp-af-evpn] peer 2.2.2.2 advertise irb
[*Spine-bgp-af-evpn] quit
[*Spine-bgp] quit
[*Spine] commit

    # 配置Leaf1。

    [~Leaf1] bgp 100
[~Leaf1-bgp] l2vpn-family evpn
[~Leaf1-bgp-af-evpn] peer 4.4.4.4 advertise irb
[*Leaf1-bgp-af-evpn] quit
[*Leaf1-bgp] quit
[*Leaf1] commit

    Leaf2的配置与Leaf1配置类似，这里不再赘述。具体配置过程略，请参考配置文件。

     

  11. 在Leaf1、Leaf2、Leaf3上配置用于DHCP业务的VPN实例。 

    # 配置Leaf3。创建DHCP VPN实例，并将与DHCP Server相连的接口绑定至VPN实例。

    [~Leaf3] ip vpn-instance dhcp
[*Leaf3-vpn-instance-dhcp] vxlan vni 5000
[*Leaf3-vpn-instance-dhcp] ipv4-family
[*Leaf3-vpn-instance-dhcp-af-ipv4] route-distinguisher 30:3
[*Leaf3-vpn-instance-dhcp-af-ipv4] vpn-target 100:5000 evpn
[*Leaf3-vpn-instance-dhcp-af-ipv4] quit
[*Leaf3-vpn-instance-dhcp] quit
[*Leaf3] vlan batch 30
[*Leaf3] interface 10ge 1/0/2
[*Leaf3-10GE1/0/2] port default vlan 30
[*Leaf3-10GE1/0/2] quit
[*Leaf3] interface vlanif 30
[*Leaf3-Vlanif30] ip binding vpn-instance dhcp
[*Leaf3-Vlanif30] ip address 10.1.5.1 24
[*Leaf3-Vlanif30] quit
[*Leaf3] commit

    # 配置Leaf1。创建DHCP VPN实例，并创建一个LoopBack口，绑定至VPN实例。LoopBack口IP地址可以和网关VBDIF接口相同。

    [~Leaf1] ip vpn-instance dhcp
[*Leaf1-vpn-instance-dhcp] vxlan vni 5000
[*Leaf1-vpn-instance-dhcp] ipv4-family
[*Leaf1-vpn-instance-dhcp-af-ipv4] route-distinguisher 30:1
[*Leaf1-vpn-instance-dhcp-af-ipv4] vpn-target 100:5000 evpn
[*Leaf1-vpn-instance-dhcp-af-ipv4] quit
[*Leaf1-vpn-instance-dhcp] quit
[*Leaf1] interface loopback 2
[*Leaf1-LoopBack2] ip binding vpn-instance dhcp
[*Leaf1-LoopBack2] ip address 10.1.1.1 24
[*Leaf1-LoopBack2] quit
[*Leaf1] commit

    Leaf2的配置与Leaf1配置类似，这里不再赘述。具体配置过程略，请参考配置文件。

     

  12. 在Leaf3、Leaf1、Leaf2上发布IP前缀类型路由，使各DHCP VPN实例的路由可以互通。 

    # 配置Leaf3。

    [~Leaf3] bgp 100
[*Leaf3-bgp] ipv4-family vpn-instance dhcp
[*Leaf3-bgp-dhcp] import-route direct
[*Leaf3-bgp-dhcp] advertise l2vpn evpn
[*Leaf3-bgp-dhcp] quit
[*Leaf3-bgp] quit
[*Leaf3] interface nve 1
[*Leaf3-Nve1] source 3.3.3.3
[*Leaf3-Nve1] quit
[*Leaf3] commit

    # 配置Leaf1。

    [~Leaf1] bgp 100
[*Leaf1-bgp] ipv4-family vpn-instance dhcp
[*Leaf1-bgp-dhcp] import-route direct
[*Leaf1-bgp-dhcp] advertise l2vpn evpn
[*Leaf1-bgp-dhcp] quit
[*Leaf1-bgp] quit
[*Leaf1] commit

    Leaf2的配置与Leaf1配置类似，这里不再赘述。具体配置过程略，请参考配置文件。

     

  13. 在Leaf1和Leaf2上配置DHCP Relay。 

    # 配置Leaf1。

    [~Leaf1] dhcp enable
[*Leaf1] interface loopback 3
[*Leaf1-LoopBack3] ip binding vpn-instance dhcp
[*Leaf1-LoopBack3] ip address 5.5.5.5 32
[*Leaf1-LoopBack3] quit
[*Leaf1] interface vbdif10
[*Leaf1-Vbdif10] dhcp select relay
[*Leaf1-Vbdif10] dhcp relay binding server ip 10.1.5.2 vpn-instance dhcp
[*Leaf1-Vbdif10] dhcp relay giaddr outgoing-interface-address
[*Leaf1-Vbdif10] dhcp option82 vss-control insert enable
[*Leaf1-Vbdif10] dhcp option82 link-selection insert enable
[*Leaf1-Vbdif10] dhcp option82 server-id-override insert enable
[*Leaf1-Vbdif10] dhcp option82 vendor-specific insert enable
[*Leaf1-Vbdif10] dhcp option82 vendor-specific format vendor-sub-option 10 source-ip-address 5.5.5.5
[*Leaf1-Vbdif10] quit
[*Leaf1] commit

    Leaf2的配置与Leaf1配置类似，这里不再赘述。具体配置过程略，请参考配置文件。

     

  14. 配置DHCP服务器。 

    具体配置过程略。DHCP服务器需要满足以下条件：

    • 在DHCP服务器上配置地址池，以便服务器端分配正确的IP地址给客户端。

    • 建议配置地址池租期，提高IP地址的使用效率。

    • 建议配置DHCP Snooping安全策略，防止非法用户攻击。

     

  15. 验证配置结果 

    # 在Leaf1上通过display dhcp relay命令查看接口的DHCP中继配置情况。

    [~Leaf1] display dhcp relay interface vbdif10
 DHCP relay agent running information of interface Vbdif10 :
 Server IP address/VPN Name : 10.1.5.2          dhcp
 Gateway address in use     : 10.1.1.1

     

配置文件

  • Spine的配置文件

    #
sysname Spine
#
assign forward nvo3 acl extend enable   //仅CE12800需要配置此步骤
#
evpn-overlay enable
#
interface 10GE1/0/1
 undo portswitch
 ip address 192.168.1.2 255.255.255.0
#
interface 10GE1/0/2
 undo portswitch
 ip address 192.168.2.2 255.255.255.0
#
interface 10GE1/0/3
 undo portswitch
 ip address 192.168.3.2 255.255.255.0
#
interface LoopBack1
 ip address 4.4.4.4 255.255.255.255
#
bgp 100
 peer 1.1.1.1 as-number 100
 peer 1.1.1.1 connect-interface LoopBack1
 peer 2.2.2.2 as-number 100
 peer 2.2.2.2 connect-interface LoopBack1
 peer 3.3.3.3 as-number 100
 peer 3.3.3.3 connect-interface LoopBack1
 #
 ipv4-family unicast
  peer 1.1.1.1 enable
  peer 2.2.2.2 enable
  peer 3.3.3.3 enable
 #
 l2vpn-family evpn
  undo policy vpn-target
  peer 1.1.1.1 enable
  peer 1.1.1.1 advertise irb
  peer 1.1.1.1 reflect-client
  peer 2.2.2.2 enable
  peer 2.2.2.2 advertise irb
  peer 2.2.2.2 reflect-client
  peer 3.3.3.3 enable
  peer 3.3.3.3 reflect-client
#
ospf 1
 area 0.0.0.0
  network 4.4.4.4 0.0.0.0
  network 192.168.1.0 0.0.0.255
  network 192.168.2.0 0.0.0.255
  network 192.168.3.0 0.0.0.255
#
return

  • Leaf1的配置文件

    #
sysname Leaf1
#
assign forward nvo3 acl extend enable   //仅CE12800需要配置此步骤
#
dhcp enable
#
evpn-overlay enable
#
ip vpn-instance dhcp
 ipv4-family
  route-distinguisher 30:1
  vpn-target 100:5000 export-extcommunity evpn
  vpn-target 100:5000 import-extcommunity evpn
 vxlan vni 5000
#
ip vpn-instance vpn1
 ipv4-family
  route-distinguisher 20:1
  vpn-target 100:5010 export-extcommunity evpn
  vpn-target 100:5010 import-extcommunity evpn
 vxlan vni 5010
#
bridge-domain 10
 vxlan vni 10
 evpn
  route-distinguisher 10:1
  vpn-target 100:5010 export-extcommunity
  vpn-target 100:10 export-extcommunity
  vpn-target 100:10 import-extcommunity
#
interface Vbdif10
 ip binding vpn-instance vpn1
 ip address 10.1.1.1 255.255.255.0
 dhcp select relay
 dhcp relay binding server ip 10.1.5.2 vpn-instance dhcp
 dhcp relay giaddr outgoing-interface-address
 dhcp option82 vss-control insert enable
 dhcp option82 server-id-override insert enable
 dhcp option82 link-selection insert enable
 dhcp option82 vendor-specific insert enable
 dhcp option82 vendor-specific format vendor-sub-option 10 source-ip-address 5.5.5.5
 vxlan anycast-gateway enable
 arp collect host enable
#
interface 10GE1/0/1
 undo portswitch
 ip address 192.168.1.1 255.255.255.0
#
interface 10GE1/0/2.1 mode l2
 encapsulation dot1q vid 10
 bridge-domain 10
#
interface LoopBack1
 ip address 1.1.1.1 255.255.255.255
#
interface LoopBack2
 ip binding vpn-instance dhcp
 ip address 10.1.1.1 255.255.255.0
#
interface LoopBack3
 ip binding vpn-instance dhcp
 ip address 5.5.5.5 255.255.255.255
#
interface Nve1
 source 1.1.1.1
 vni 10 head-end peer-list protocol bgp
#
bgp 100
 peer 4.4.4.4 as-number 100
 peer 4.4.4.4 connect-interface LoopBack1
 #
 ipv4-family unicast
  peer 4.4.4.4 enable
 #
 ipv4-family vpn-instance dhcp
  import-route direct
  advertise l2vpn evpn
 #
 l2vpn-family evpn
  policy vpn-target
  peer 4.4.4.4 enable
  peer 4.4.4.4 advertise irb
#
ospf 1
 area 0.0.0.0
  network 1.1.1.1 0.0.0.0
  network 192.168.1.0 0.0.0.255
#
return

  • Leaf2的配置文件

    #
sysname Leaf2
#
assign forward nvo3 acl extend enable   //仅CE12800需要配置此步骤
#
dhcp enable
#
evpn-overlay enable
#
ip vpn-instance dhcp
 ipv4-family
  route-distinguisher 30:2
  vpn-target 100:5000 export-extcommunity evpn
  vpn-target 100:5000 import-extcommunity evpn
 vxlan vni 5000
#
ip vpn-instance vpn1
 ipv4-family
  route-distinguisher 20:2
  vpn-target 100:5010 export-extcommunity evpn
  vpn-target 100:5010 import-extcommunity evpn
 vxlan vni 5010
#
bridge-domain 20
 vxlan vni 20
 evpn
  route-distinguisher 10:2
  vpn-target 100:20 export-extcommunity
  vpn-target 100:5010 export-extcommunity
  vpn-target 100:20 import-extcommunity
#
interface Vbdif20
 ip binding vpn-instance vpn1
 ip address 10.1.2.1 255.255.255.0
 dhcp select relay
 dhcp relay binding server ip 10.1.5.2 vpn-instance dhcp
 dhcp relay giaddr outgoing-interface-address
 dhcp option82 vss-control insert enable
 dhcp option82 server-id-override insert enable
 dhcp option82 link-selection insert enable
 dhcp option82 vendor-specific insert enable
 dhcp option82 vendor-specific format vendor-sub-option 20 source-ip-address 6.6.6.6
 vxlan anycast-gateway enable
 arp collect host enable
#
interface 10GE1/0/1
 undo portswitch
 ip address 192.168.2.1 255.255.255.0
#
interface 10GE1/0/2.1 mode l2
 encapsulation dot1q vid 20
 bridge-domain 20
#
interface LoopBack1
 ip address 2.2.2.2 255.255.255.255
#
interface LoopBack2
 ip binding vpn-instance dhcp
 ip address 10.1.2.1 255.255.255.0
#
interface LoopBack3
 ip binding vpn-instance dhcp
 ip address 6.6.6.6 255.255.255.255
#
interface Nve1
 source 2.2.2.2
 vni 20 head-end peer-list protocol bgp
#
bgp 100
 peer 4.4.4.4 as-number 100
 peer 4.4.4.4 connect-interface LoopBack1
 #
 ipv4-family unicast
  peer 4.4.4.4 enable
 #
 ipv4-family vpn-instance dhcp
  import-route direct
  advertise l2vpn evpn
 #
 l2vpn-family evpn
  policy vpn-target
  peer 4.4.4.4 enable
  peer 4.4.4.4 advertise irb
#
ospf 1
 area 0.0.0.0
  network 2.2.2.2 0.0.0.0
  network 192.168.2.0 0.0.0.255
#
return

  • Leaf3的配置文件

    #
sysname Leaf3
#
assign forward nvo3 acl extend enable   //仅CE12800需要配置此步骤
#
vlan batch 30
#
evpn-overlay enable
#
ip vpn-instance dhcp
 ipv4-family
  route-distinguisher 30:3
  vpn-target 100:5000 export-extcommunity evpn
  vpn-target 100:5000 import-extcommunity evpn
 vxlan vni 5000
#
interface Vlanif30
 ip binding vpn-instance dhcp
 ip address 10.1.5.1 255.255.255.0
#
interface 10GE1/0/1
 undo portswitch
 ip address 192.168.3.1 255.255.255.0
#
interface 10GE1/0/2
 port default vlan 30
#
interface LoopBack1
 ip address 3.3.3.3 255.255.255.255
#
interface Nve1
 source 3.3.3.3
#
bgp 100
 peer 4.4.4.4 as-number 100
 peer 4.4.4.4 connect-interface LoopBack1
 #
 ipv4-family unicast
  peer 4.4.4.4 enable
 #
 ipv4-family vpn-instance dhcp
  import-route direct
  advertise l2vpn evpn
 #
 l2vpn-family evpn
  policy vpn-target
  peer 4.4.4.4 enable
#
ospf 1
 area 0.0.0.0
  network 3.3.3.3 0.0.0.0
  network 192.168.3.0 0.0.0.255
#
return
阅读剩余
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THE END
QSFP112 to 2QSFP112光缆
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