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Example: Concurrent Configuration of Dynamic DHCP IP Demux and PPPoE Demux Interfaces over the Same VLAN Demux Interface

This example shows how to configure both dynamic DHCP IP demux and PPPoE demux interfaces over the same dynamic VLAN demux interface. The example provides an IPv4 configuration. However, you can also configure concurrent IP over Ethernet/DHCP and PPPoE interfaces over the same VLAN interface using IPv6 addressing.

Note: You can also configure dynamic IP over Ethernet/DHCP and PPPoE interfaces concurrently over the same static VLAN interface. For information on how to configure static VLAN interfaces, see the Ethernet Interfaces.

Requirements

Before you begin, make sure to configure either DHCP Relay or DHCP Local Server. You can find information about configuring either of these components in the Junos OS Subscriber Management and Services Library.

Overview

With the introduction of the family pppoe statement, PPPoE is no longer treated as an exclusive encapsulation configuration and you can configure VLAN interfaces with multiple protocol interface stacks. For example, you can configure IP over Ethernet/DHCP and PPPoE interfaces concurrently over a single VLAN interface.

Configuration

• Preparing a Subscriber Access Interface
• Preparing the Loopback Interface
• Configuring a Dynamic Profile to Create Dynamic Single-Tagged VLANs
• Configuring a Dynamic Profile to Create Dynamic Dual-Tagged VLANs
• Configuring a Dynamic Profile to Create Dynamic IP Demux Interfaces
• Configuring a Dynamic Profile to Create Dynamic PPPoE Interfaces

Preparing a Subscriber Access Interface

CLI Quick Configuration

To quickly configure the aggregated Ethernet interface over which subscribers access the router:

Step-by-Step Procedure

1. Access the physical interface over which you want subscribers to initially access the router.
   [edit]user@host# edit interfaces ge-5/0/9
2. Specify the aggregated Ethernet interface to which the physical interface belongs.
   [edit interfaces ge-5/0/9]user@host# set gigether-options 802.3ad ae0
3. Repeat Step 1 and Step 2for each interface you want to assign to the aggregated Ethernet bundle.
   [edit]user@host# set interfaces ge-5/1/9 gigether-options 802.3ad ae0
4. Access the aggregated Ethernet interface.
   [edit]user@host# edit interfaces ae0
5. Specify the VLAN tagging that you want the aggregated Ethernet interfaces to use.
   [edit interfaces ae0]user@host# set flexible-vlan-tagging
6. Edit the auto-configure stanza to automatically configure VLANs.
   [edit interfaces ae0]user@host# edit auto-configure
7. Edit the vlan-ranges stanza for single-tagged VLANs.
   [edit interfaces ae0 auto-configure]user@host# edit vlan-ranges
8. Specify the dynamic VLAN profile that you want the interface to use for dynamically creating single-tagged VLANs.
   [edit interfaces ae0 auto-configure vlan-ranges]user@host# edit dynamic-profile Auto-VLAN-Demux
9. Specify what VLAN Ethernet packet type the VLAN profile accepts.
   [edit interfaces ae0 auto-configure vlan-ranges dynamic-profile Auto-VLAN-Demux]user@host# set accept any
10. Specify the VLAN ranges that you want the dynamic profile to use. The following example specifies a lower VLAN ID limit of 1000 and an upper VLAN ID limit of 1500.
    [edit interfaces ae0 auto-configure vlan-ranges dynamic-profile Auto-VLAN-Demux]user@host# set ranges 1000-1500
11. Edit the stacked-vlan-ranges stanza for the dual-tagged VLANs.
    [edit interfaces ae0 auto-configure]user@host# edit stacked-vlan-ranges
12. Specify the dynamic VLAN profile that you want the interface to use for dynamically creating dual-tagged VLANs.
    [edit interfaces ae0 auto-configure stacked-vlan-ranges]user@host# edit dynamic-profile Auto-Stacked-VLAN-Demux
13. Specify what VLAN Ethernet packet type the stacked VLAN profile accepts.
    [edit interfaces ae0 auto-configure stacked-vlan-ranges dynamic-profile Auto-Stacked-VLAN-Demux]user@host# set accept any
14. Specify the outer and inner stacked VLAN ranges that you want the dynamic profile to use. The following example specifies an outer stacked VLAN ID range from 1501 through 2000 (to avoid overlapping VLAN IDs with single-tag VLANs) and an inner stacked VLAN ID range of any (enabling a range from 1 through 4094 for the inner stacked VLAN ID).
    [edit interfaces ge-5/0/9 auto-configure stacked-vlan-ranges dynamic-profile Auto-Stacked-VLAN-Demux]user@host# set ranges 1501-2000,any
15. (Optional) Activate the transmission of LACP packets on the aggregated Ethernet interfaces.
    [edit interfaces ae0]user@host# set aggregated-ether-options lacp active
16. Specify that the aggregated Ethernet interfaces use link protection.
    [edit interfaces ae0]user@host# set aggregated-ether-options link-protection

Preparing the Loopback Interface

CLI Quick Configuration

To quickly configure the required loopback interface for this example:

Step-by-Step Procedure

1. Configure a loopback interface.
   [edit]user@host# edit interfaces lo0.0
2. Specify that the loopback interface accept inet packets.
   [edit interfaces lo0 unit 0]user@host# edit family inet
3. Specify the IP address for the loopback interface.
   [edit interfaces lo0 unit 0 family inet]user@host# set address 100.100.100.1/32

Configuring a Dynamic Profile to Create Dynamic Single-Tagged VLANs

CLI Quick Configuration

To quickly configure the dynamic profile used to dynamically create single-tagged VLANs in the example:

Step-by-Step Procedure

1. Create a dynamic profile for automatically creating VLAN interfaces.
   [edit]user@host# edit dynamic-profiles Auto-VLAN-Demux
2. Specify that the dynamic VLAN profile use the demux interface.
   [edit dynamic-profiles “Auto-VLAN-Demux”]user@host# edit interfaces demux0
3. Specify that the dynamic profile apply the demux interface unit value to the dynamic VLANs.
   [edit dynamic-profiles Auto-VLAN-Demux interfaces demux0]user@host# edit unit $junos-interface-unit
4. Specify that the demux source accept IPv4 (inet) packets.
   [edit dynamic-profiles Auto-VLAN-Demux interfaces demux0 unit “$junos-interface-unit”]user@host# set demux-source inet
5. (Optional) Specify that each dynamically created interface respond to any ARP request, as long as an active route exists to the target address of the ARP request.
   [edit dynamic-profiles Auto-VLAN-Demux interfaces demux0 unit “$junos-interface-unit”]user@host# set proxy-arp
6. Specify that VLAN IDs are dynamically created.
   [edit dynamic-profiles Auto-VLAN-Demux interfaces demux0 unit “$junos-interface-unit”]user@host# set vlan-id $junos-vlan-id
7. Specify the logical underlying interface for the dynamic VLANs.
   [edit dynamic-profiles Auto-VLAN-Demux interfaces demux0 unit “$junos-interface-unit”]user@host# set demux-options underlying-interface $junos-interface-ifd-name
8. Specify that the VLAN demux interface can accept inet family packets for IP over Ethernet/DHCP subscribers.
   [edit dynamic-profiles Auto-VLAN-Demux interfaces demux0 unit “$junos-interface-unit”]user@host# edit family inet
9. Specify the loopback address as the unnumbered address and preferred source address for the inet family.
   [edit dynamic-profiles Auto-VLAN-Demux interfaces demux0 unit “$junos-interface-unit” family inet]user@host# set unnumbered-address lo0.0 preferred-source-address 100.100.100.1
10. Specify that the VLAN demux interface can accept pppoe family packets for PPPoE subscribers.
    [edit dynamic-profiles Auto-VLAN-Demux interfaces demux0 unit “$junos-interface-unit”]user@host# edit family pppoe
11. Prevent multiple PPPoE sessions from being created for the same PPPoE subscriber on the same VLAN interface.
    [edit dynamic-profiles Auto-VLAN-Demux interfaces demux0 unit “$junos-interface-unit” family pppoe]user@host# set duplicate-protection
12. Apply the dynamic PPP interface profile to any dynamic PPP interfaces.
    [edit dynamic-profiles Auto-VLAN-Demux interfaces demux0 unit “$junos-interface-unit” family pppoe]user@host# set dynamic-profile PPP-Base-PAP

Configuring a Dynamic Profile to Create Dynamic Dual-Tagged VLANs

CLI Quick Configuration

To quickly configure the dynamic profile used to dynamically create stacked/dual-tagged VLANs in the example:

Step-by-Step Procedure

1. Create a dynamic profile for automatically creating VLAN interfaces.
   [edit]user@host# edit dynamic-profiles Auto-Stacked-VLAN-Demux
2. Specify that the dynamic VLAN profile use the demux interface.
   [edit dynamic-profiles “Auto-Stacked-VLAN-Demux”]user@host# edit interfaces demux0
3. Specify that the dynamic profile apply the demux interface unit value to the dynamic VLANs.
   [edit dynamic-profiles Auto-Stacked-VLAN-Demux interfaces demux0]user@host# edit unit $junos-interface-unit
4. Specify that the demux source accept IPv4 (inet) packets.
   [edit dynamic-profiles Auto-Stacked-VLAN-Demux interfaces demux0 unit “$junos-interface-unit”]user@host# set demux-source inet
5. (Optional) Specify that each dynamically created interface respond to any ARP request, as long as an active route exists to the target address of the ARP request.
   [edit dynamic-profiles Auto-Stacked-VLAN-Demux interfaces demux0 unit “$junos-interface-unit”]user@host# set proxy-arp
6. Specify that the outer VLAN ID is dynamically created.
   [edit dynamic-profiles Auto-Stacked-VLAN-Demux interfaces demux0 unit “$junos-interface-unit”]user@host# set vlan-id -tags outer $junos-stacked-vlan-id
7. Specify that the inner VLAN ID is dynamically created.
   [edit dynamic-profiles Auto-Stacked-VLAN-Demux interfaces demux0 unit “$junos-interface-unit”]user@host# set vlan-id -tags inner $junos-vlan-id
8. Specify the logical underlying interface for the dynamic VLANs.
   [edit dynamic-profiles Auto-Stacked-VLAN-Demux interfaces demux0 unit “$junos-interface-unit”]user@host# set demux-options underlying-interface $junos-interface-ifd-name
9. Specify that the VLAN demux interface can accept inet family packets for IP over Ethernet/DHCP subscribers.
   [edit dynamic-profiles Auto-Stacked-VLAN-Demux interfaces demux0 unit “$junos-interface-unit”]user@host# edit family inet
10. Specify the loopback address as the unnumbered address and preferred source address for the inet family.
    [edit dynamic-profiles Auto-Stacked-VLAN-Demux interfaces demux0 unit “$junos-interface-unit” family inet]user@host# set unnumbered-address lo0.0 preferred-source-address 100.100.100.1
11. Specify that the VLAN demux interface can accept pppoe family packets for PPPoE subscribers.
    [edit dynamic-profiles Auto-Stacked-VLAN-Demux interfaces demux0 unit “$junos-interface-unit”]user@host# edit family pppoe
12. Prevent the activation of another dynamic PPPoE logical interface on the same demux underlying interface.
    [edit dynamic-profiles Auto-Stacked-VLAN-Demux interfaces demux0 unit “$junos-interface-unit” family pppoe]user@host# set duplicate-protection
13. Apply the dynamic PPP interface profile to any dynamic PPP interfaces.
    [edit dynamic-profiles Auto-Stacked-VLAN-Demux interfaces demux0 unit “$junos-interface-unit” family pppoe]user@host# set dynamic-profile PPP-Base-PAP

Configuring a Dynamic Profile to Create Dynamic IP Demux Interfaces

CLI Quick Configuration

To quickly configure the dynamic profile used to dynamically create DHCP IP demux interfaces in the example:

Step-by-Step Procedure

1. Create a dynamic profile for dynamically creating IP demux interfaces.
   [edit]user@host# edit dynamic-profiles DHCP-IP-Demux
2. Specify that the dynamic profile use the demux0 interface.
   [edit dynamic-profiles DHCP-IP-Demux]user@host# edit interfaces demux0
3. Specify that the dynamic profile apply the interface unit value to the dynamic PPPoE interfaces.
   [edit dynamic-profiles DHCP-IP-Demux interfaces demux0]user@host# edit unit $junos-interface-unit
4. (Optional) Configure the router to respond to any ARP request, as long as the router has an active route to the target address of the ARP request.
   [edit dynamic-profiles DHCP-IP-Demux interfaces demux0 unit “$junos-interface-unit”]user@host# set proxy-arp
5. Specify the logical underlying interface for the dynamic IP demux interfaces.
   [edit dynamic-profiles DHCP-IP-Demux interfaces demux0 unit “$junos-interface-unit”]user@host# set demux-options underlying-interface $junos-underlying-interface
6. Specify the protocol family information for the dynamic IP demux interfaces.
   [edit dynamic-profiles DHCP-IP-Demux interfaces demux0 unit “$junos-interface-unit”]user@host# edit family inet
7. Specify the demux source address is obtained from the incoming subscriber IP address.
   [edit dynamic-profiles DHCP-IP-Demux interfaces demux0 unit “$junos-interface-unit” family inet]user@host# set demux-source $junos-subscriber-ip-address
8. Specify the loopback interface as the unnumbered address and the demux interface IP address as the preferred source address for the dynamic IP demux interfaces.
   [edit dynamic-profiles DHCP-IP-Demux interfaces demux0 unit “$junos-interface-unit” family inet]user@host# set unnumbered-address lo0.0 preferred-source-address 100.100.100.1

Configuring a Dynamic Profile to Create Dynamic PPPoE Interfaces

CLI Quick Configuration

To quickly configure the dynamic profile used to dynamically create PPPoE interfaces in the example:

Step-by-Step Procedure

1. Create a dynamic profile for automatically creating PPPoE interfaces.
   [edit]user@host# edit dynamic-profiles PPP-Base-PAP
2. Specify that the dynamic PPPoE profile use the pp0 interface.
   [edit dynamic-profiles PPP-Base-PAP]user@host# edit interfaces pp0
3. Specify that the dynamic profile apply the interface unit value to the dynamic PPPoE interfaces.
   [edit dynamic-profiles PPP-Base-PAP interfaces pp0]user@host# edit unit $junos-interface-unit
4. Specify that dynamically created PPPoE interfaces use PAP authentication.
   [edit dynamic-profiles PPP-Base-PAP interfaces pp0 unit “$junos-interface-unit”]user@host# set ppp-options pap
5. Specify the logical underlying interface for the dynamic PPPoE interfaces.
   user@host# set ppp-options pap
   [edit dynamic-profiles PPP-Base-PAP interfaces pp0 unit “$junos-interface-unit”]user@host# set pppoe-options underlying-interface $junos-underlying-interface
6. Specify that the router act as a PPPoE server.
   [edit dynamic-profiles PPP-Base-PAP interfaces pp0 unit “$junos-interface-unit”]user@host# set pppoe-options server
7. (Optional) Disable the sending of keepalive messages on the dynamic PPPoE interfaces.
   [edit dynamic-profiles PPP-Base-PAP interfaces pp0 unit “$junos-interface-unit”]user@host# set no-keepalives
8. Specify the protocol family information for the dynamic PPPoE interfaces.
   [edit dynamic-profiles PPP-Base-PAP interfaces pp0 unit “$junos-interface-unit”]user@host# edit family inet
9. Specify the loopback interface as the unnumbered address for the dynamic PPPoE interfaces.
   [edit dynamic-profiles PPP-Base-PAP interfaces pp0 unit “$junos-interface-unit”]user@host# set unnumbered-address lo0.0

Verification

• Subscriber Verification
• Interface Verification

Subscriber Verification

Purpose

View subscriber information on the router.

Action

• To display dynamic subscriber information:
  user@host# show subscribers detail

Interface Verification

Purpose

View interface-specific information on the router.

Action

• To display interface-specific output:
  user@host# show interfaces interface-name