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Configuring the Layer 2 CPE When Running MX Series Router Cloud CPE Multiple Ethernet Interface and RVI Services

Note: This procedure uses a Juniper Networks EX Series Ethernet Switch for the Layer 2 CPE.

1. Configure the first Ethernet interface on the Layer 2 CPE.
   [edit]user@host# set interfaces ge-0/0/8 unit 0 family ethernet-switching port-mode access
2. Configure the second Ethernet interface by specifying a different physical interface. You can use the same logical interface number, which in our example is 0.
   [edit]user@host# set interfaces ge-0/0/9 unit 0 family ethernet-switching port-mode access
3. Configure the VLAN trunk port for a WAN link.
   [edit]user@host# set interfaces ge-0/0/10 unit 0 family ethernet-switching port-mode trunk
4. Configure the RVIs.
   [edit]user@host# set interfaces vlan unit 0 family inet address 192.168.1.254/24user@host# set interfaces vlan unit 1 family inet address 192.168.2.254/24
5. Configure the VLAN for the first department; for example, Sales.
   1. Specify the VLAN name and VLAN ID.
      [edit]user@host# set vlans sales-vlan vlan-id 105
   2. Specify the interface associated with the VLAN.
      [edit vlans sales-vlan]user@host# set interface ge-0/0/8.0
   3. Specify the trunk port interface associated with the VLAN.
      [edit vlans sales-vlan]user@host# set interface ge-0/0/10.0
   4. Associate a Layer 3 interface with the VLAN. Configure Layer 3 interfaces on trunk ports to allow the interface to transfer traffic between multiple VLANs. Within a VLAN, traffic is bridged, whereas across VLANs, traffic is routed.
      [edit vlans sales-vlan]user@host# set l3-interface vlan.0
6. Configure the VLAN for the second department; for example, Engineering.
   1. Specify the VLAN name and VLAN ID.
      [edit]user@host# set vlans eng-vlan vlan-id 106
   2. Specify the interface associated with the VLAN.
      [edit vlans eng-vlan]user@host# set interface ge-0/0/9.0
   3. Specify the trunk port interface associated with the VLAN.
      [edit vlans eng-vlan]user@host# set interface ge-0/0/10.0
   4. Associate a Layer 3 interface with the VLAN. Configure Layer 3 interfaces on trunk ports to allow the interface to transfer traffic between multiple VLANs. Within a VLAN, traffic is bridged, whereas across VLANs, traffic is routed.
      [edit vlans eng-vlan]user@host# set l3-interface vlan.1
7. Finally, configure a static route with the RVI addresses as the gateway on the host connecting to the subscriber VLAN for inter-VLAN traffic. If the customer host device uses DHCP to get IP addresses, a static route can be pushed by the DHCP server through option 121; otherwise, you must manually configure the static route.
   • Add a static route for the subnet using the RVI as the gateway.
     route add -net 192.168.2.0/24 gw 192.168.1.254
   • Add a static route using the IRB as the gateway.
     route add -net 0.0.0.0/0 gw 192.168.1.1