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Example: Configuring a Dynamic PPPoE Subscriber Interface on a Static Underlying VLAN Demux Interface over Aggregated Ethernet

Requirements

• MX Series 3D Universal Edge Routers
• MPCs
• Junos OS Release 11.2 or later

No special configuration beyond device initialization is required before you can configure this feature.

Overview

Aggregated Ethernet bundles enable link redundancy between the router and networking devices connected by Ethernet links. This example describes how to configure link redundancy for dynamic PPPoE subscribers over aggregated Ethernet interface, ae0, with an intermediate static VLAN demux interface, demux0.100. Sample tasks include configuring a two-member aggregated Ethernet bundle, configuring a static VLAN demux interface that underlies the PPPoE subscriber interface, and configuring the dynamic profile that establishes the dynamic PPPoE subscriber interfaces.

• $junos-interface-unit—Represents the logical unit number of the dynamic PPPoE logical interface. This predefined variable is dynamically replaced with the unit number supplied by the router when the subscriber logs in.
• $junos-underlying-interface—Represents the name of the underlying Ethernet interface. This predefined variable is dynamically replaced with the interface name supplied by the router when the subscriber logs in.

This example does not show all possible configuration choices.

Configuration

CLI Quick Configuration

To quickly configure link redundancy for dynamic PPPoE subscribers over a static VLAN demux interface over aggregated Ethernet, copy the following commands, paste them in a text file, remove any line breaks, and then copy and paste the commands into the CLI.

Step-by-Step Procedure

1. Define the number of aggregated Ethernet devices on the router.
   [edit chassis]user@host# set aggregated-devices ethernet device-count 1
2. Configure a two-link aggregated Ethernet logical interface to serve as the underlying interface for the static VLAN demux subscriber interface. In this example, the LAG bundle is configured for one-to-one active/backup link redundancy. To support link redundancy at the MPC level, the LAG bundle attaches to ports from two different MPCs.
   [edit interfaces]user@host# set ge-5/0/3 gigether-options 802.3ad ae0user@host# set ge-5/0/3 gigether-options 802.3ad primaryuser@host# set ge-5/1/2 gigether-options 802.3ad ae0user@host# set ge-5/1/2 gigether-options 802.3ad backup
3. Enable link protection on the aggregated Ethernet logical interface and configure support for single and dual (stacked) VLAN tags.
   [edit interfaces]user@host# set ae0 aggregated-ether-options link-protectionuser@host# set ae0 flexible-vlan-tagging
4. Configure the VLAN demux interface over the aggregated Ethernet logical interface.
   [edit interfaces]user@host# set demux0 unit 100 vlan-id 100user@host# set demux0 unit 100 demux-options underlying-interface ae0
5. Configure the PPPoE family attributes on the VLAN demux interface, including the dynamic profile.
   [edit interfaces]user@host# set demux0 unit 100 family pppoe access-concentrator pppoe-server-1user@host# set demux0 unit 100 family pppoe duplicate-protectionuser@host# set demux0 unit 100 family pppoe dynamic-profile pppoe-profile
6. Configure the dynamic profile that creates the PPPoE subscriber interfaces.
   [edit dynamic-profiles pppoe-profile]user@host# edit interfaces pp0 unit $junos-interface-unit[edit dynamic-profiles pppoe-profile interfaces pp0 unit "$junos-interface-unit"]user@host# set pppoe-options underlying-interface $junos-underlying-interfaceuser@host# set pppoe-options serveruser@host# set family inet unnumbered-address lo0.0

Results

From configuration mode, confirm the aggregated device configuration by entering the show chassis command. Confirm the interface configuration by entering the show interfaces command. Confirm the dynamic profile configuration by entering the show dynamic-profiles command. If the output does not display the intended configuration, repeat the configuration instructions in this example to correct it.

If you are done configuring the device, enter commit from configuration mode.

Verification

To confirm that the configuration is working properly, perform these tasks:

• Verifying the Aggregated Ethernet Interface Configuration
• Verifying the demux0 Interface Configuration

Verifying the Aggregated Ethernet Interface Configuration

Purpose

Verify that the interface values match your configuration, the link is up, and traffic is flowing.

Action

From operational mode, enter the show interfaces redundancy command.

Interface  State            Last change  Primary      Secondary    Current status
ae0        On primary                    ge-5/0/3     ge-5/1/2     both up

From operational mode, enter the show interfaces ae0 command.

Physical interface: ae0, Enabled, Physical link is Up
  Interface index: 128, SNMP ifIndex: 606
  Link-level type: Ethernet, MTU: 1522, Speed: 1Gbps, BPDU Error: None,
  MAC-REWRITE Error: None, Loopback: Disabled, Source filtering: Disabled,
  Flow control: Disabled, Minimum links needed: 1, Minimum bandwidth needed: 0
  Device flags   : Present Running
  Interface flags: SNMP-Traps Internal: 0x4000
  Current address: 00:1f:12:b8:ef:c0, Hardware address: 00:1f:12:b8:ef:c0
  Last flapped   : 2011-03-11 13:24:18 PST (2d 03:34 ago)
  Input rate     : 1984 bps (2 pps)
  Output rate    : 0 bps (0 pps)

  Logical interface ae0.32767 (Index 69) (SNMP ifIndex 709)
    Flags: SNMP-Traps 0x4004000 VLAN-Tag [ 0x0000.0 ]  Encapsulation: ENET2
    Statistics        Packets        pps         Bytes          bps
    Bundle:
        Input :        371259          2      46036116         1984
        Output:             0          0             0            0
    Protocol multiservice, MTU: Unlimited
      Flags: Is-Primary

Meaning

The show interfaces redundancy output shows the redundant link configuration and that both link interfaces are up. The show interfaces ae0 output shows that the aggregated Ethernet interface is up and that traffic is being received on the logical interface.

Verifying the demux0 Interface Configuration

Purpose

Verify that the VLAN demux interface displays the configured PPPoE family attributes and the member links in the aggregated Ethernet bundle.

Action

From operational mode, enter the show interfaces demux0 command.

Logical interface demux0.100 (Index 76) (SNMP ifIndex 61160)
    Flags: SNMP-Traps 0x4000 VLAN-Tag [ 0x8100.100 ]
    Encapsulation: ENET2
    Demux:
      Underlying interface: ae0 (Index 199)
    Link:
      ge-5/0/3
      ge-5/1/2
    Input packets : 2
    Output packets: 18575
    Protocol pppoe
      Dynamic Profile: pppoe-profile,
      Service Name Table: None,
      Max Sessions: 16000, Duplicate Protection: On, 
      AC Name: pppoe-server-1

Alternatively, you can enter show pppoe underlying-interfaces detail to display the state and PPPoE family configuration for all configured underlying interfaces. The output also provides information about PPPoE negotiation on a per-VLAN basis.

Meaning

The output shows the name of the underlying interface, the member links of the aggregated bundle, and the PPPoE family configuration. The output shows packet counts when traffic is present on the logical interface.