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Example: Configuring a Static PPP Subscriber Interface over ATM

This example illustrates a PPP-over-ATM (PPPoA) configuration that creates three static PPP logical subscriber interfaces over a static ATM underlying interface on an MX Series router. The router must have Module Port Concentrator/Modular Interface Card (MPC/MIC) interfaces that use an ATM MIC with small form-factor pluggable transceiver (SFP).

Requirements

This example uses the following software and hardware components:

  • Junos OS Release 12.2
  • MX Series 3D Universal Edge Router
  • ATM MIC with SFP (Model Number MIC-3D-8OC3-2OC12-ATM) and compatible MPC1 or MPC2

Before you begin:

  1. Make sure the MX Series router you are using has an ATM MIC with SFP installed and operational.
  2. Make sure you understand how to configure and use static ATM interfaces.

    See ATM Interfaces Overview.

  3. Create the dynamic profile (pppoa-cos-profile) and access profile (pe-B-ppp-clients) referenced in the configuration.

Overview

By using the ATM MIC with SFP and a supported MPC, you can configure an MX Series router to support PPP subscriber access over an ATM network. PPPoA configurations on MX Series routers consist of one or more statically created PPP logical subscriber interfaces over a static ATM underlying interface.

Optionally, you can use dynamic profiles to dynamically or statically apply subscriber services services, such as CoS and firewall filters, to the static PPP logical interface. Configuring CoS and firewall filters in this manner enables you to efficiently and economically provide these services to PPP subscribers accessing the router over an ATM network using ATM Adaptation Layer 5 (AAL5) permanent virtual connections (PVCs). This example uses a previously configured dynamic profile named pppoa-cos-profile to apply traffic scheduling and shaping parameters to logical interface at-1/0/1.2.

To configure PPPoA subscriber access on MX Series routers, you must configure the correct encapsulation type: atm-ppp-llc for PPPoA encapsulation with logical link control (LLC), or atm-ppp-vc-mux for PPPoA encapsulation with virtual circuit (VC) multiplexing. This example configures atm-ppp-llc as the encapsulation type on logical interface at-1/0/1.0, and atm-ppp-vc-mux as the encapsulation type on logical interfaces at-1/0/1.1 and at-1/0/1.2.

To provision the ATM AAL5 PVCs for access over the ATM network, you must also configure the virtual path identifiers (VPIs) on the ATM physical interface, and one or more virtual circuit identifiers (VCIs) for each VPI.

In PPPoA configurations, each statically configured logical interface (for example, at-1/0/1.0) corresponds to a PPP logical subscriber interface. This example configures three PPP logical subscriber interfaces over an ATM interface, as follows:

  • The ATM physical interface (at-1/0/1) is statically configured with VPI 0 and VPI 2.
  • Logical interface at-1/0/1.0 (logical unit 0) is configured with PPP-over AAL5 LLC encapsulation, VCI 0.120 (VCI 120 on VPI 0), PPP-specific options, and the IPv4 protocol family and address.
  • Logical interface at-1/0/1.1 (logical unit 1) is configured with PPP-over-AAL5 VC multiplexing encapsulation, VCI 2.120 (VCI 120 on VPI 2), PPP-specific options, and the IPv4 protocol family and address.
  • Logical interface at-1/0/1.2 (logical unit 2) is configured with PPP-over-AAL5 VC multiplexing encapsulation, VCI 2.121 (VCI 121 on VPI 2), PPP-specific options, and the IPv4 protocol family and address. The PPP-specific options include applying a dynamic profile named pppoa-cos-profile to the static PPP interface. The pppoa-cos-profile dynamic profile applies traffic scheduling and shaping parameters to the PPP logical subscriber interface.

Configuration

To configure static PPP logical subscriber interfaces over an ATM interface, perform these tasks:

CLI Quick Configuration

To quickly configure this example, copy the following commands, paste them in a text file, remove any line breaks, change any details necessary to match your network configuration, and then copy and paste the commands into the CLI at the [edit] hierarchy level.

# ATM Physical Interfaceset interfaces at-1/0/1 atm-options vpi 0set interfaces at-1/0/1 atm-options vpi 2## Logical Unit 0set interfaces at-1/0/1 unit 0 encapsulation atm-ppp-llcset interfaces at-1/0/1 unit 0 vci 0.120set interfaces at-1/0/1 unit 0 ppp-options chap access-profile pe-B-ppp-clientsset interfaces at-1/0/1 unit 0 ppp-options chap local-name pe-A-at-1/0/1set interfaces at-1/0/1 unit 0 keepalives interval 5set interfaces at-1/0/1 unit 0 keepalives up-count 6set interfaces at-1/0/1 unit 0 keepalives down-count 4set interfaces at-1/0/1 unit 0 family inet address 192.122.13.13/30## Logical Unit 1set interfaces at-1/0/1 unit 1 encapsulation atm-ppp-vc-muxset interfaces at-1/0/1 unit 1 vci 2.120set interfaces at-1/0/1 unit 1 keepalives interval 6set interfaces at-1/0/1 unit 1 keepalives up-count 6set interfaces at-1/0/1 unit 1 keepalives down-count 4set interfaces at-1/0/1 unit 1 family inet address 192.122.14.13/30## Logical Unit 2set interfaces at-1/0/1 unit 2 encapsulation atm-ppp-vc-muxset interfaces at-1/0/1 unit 2 vci 2.121set interfaces at-1/0/1 unit 2 ppp-options chap access-profile pe-A-ppp-clientsset interfaces at-1/0/1 unit 2 ppp-options chap local-name pe-A-at-1/0/1set interfaces at-1/0/1 unit 2 ppp-options chap passiveset interfaces at-1/0/1 unit 2 ppp-options dynamic-profile pppoa-cos-profileset interfaces at-1/0/1 unit 2 keepalives interval 5set interfaces at-1/0/1 unit 2 keepalives up-count 6set interfaces at-1/0/1 unit 2 keepalives down-count 4set interfaces at-1/0/1 unit 2 family inet address 192.122.15.13/30

Configuring the ATM Physical Interface

Step-by-Step Procedure

To configure the ATM physical interface:

  1. Specify that you want to configure ATM-specific options on the physical interface.
    [edit interfaces at-1/0/1]user@host# edit atm-options
  2. Configure one or more VPIs on the physical interface.
    [edit interfaces at-1/0/1 atm-options]user@host# set vpi 0user@host# set vpi 2

Results

From the [edit] hierarchy level in configuration mode, confirm the results of the ATM physical interface configuration by issuing the show interfaces at-1/0/1 command. If the output does not display the intended configuration, repeat the instructions in this example to correct it.

[edit]user@host# show interfaces at-1/0/1
atm-options {vpi 0;vpi 2;}

If you are done configuring the ATM physical interface, enter commit from configuration mode.

Configuring the Static PPP Subscriber Interface on Logical Unit 0

Step-by-Step Procedure

To configure the static PPP subscriber interface on logical unit 0:

  1. Configure PPP-over AAL5 LLC encapsulation on the logical interface.
    [edit interfaces at-1/0/1 unit 0]user@host# set encapsulation atm-ppc-llc
  2. Configure the VCI for the logical interface.
    [edit interfaces at-1/0/1 unit 0]user@host# set vci 0.120
  3. Specify that you want to configure options for PPP CHAP on the logical interface.
    [edit interfaces at-1/0/1 unit 0]user@host# edit ppp-options chap
  4. Assign the previously configured pe-B-ppp-clients access profile to the PPP logical subscriber interface.
    [edit interfaces at-1/0/1 unit 0 ppp-options chap]user@host# set access-profile pe-B-ppp-clients
  5. Configure the local name used by the interface in CHAP challenge and response packets.
    [edit interfaces at-1/0/1 unit 0 ppp-options chap]user@host# set local-name “pe-A-at-1/0/1”user@host# up 2
  6. Configure the transmission of keepalive messages on the logical interface.
    [edit interfaces at-1/0/1 unit 0]user@host# set keepalives interval 5user@host# set keepalives up-count 6user@host# set keepalives down-count 4
  7. Configure the IPv4 (inet) protocol family and IP address.
    [edit interfaces at-1/0/1 unit 0]user@host# set family inet address 192.122.13.13/30

Results

From the [edit] hierarchy level in configuration mode, confirm the results of the static PPP subscriber interface configuration on logical unit 0 by issuing the show interfaces at-1/0/1.0 command. If the output does not display the intended configuration, repeat the instructions in this example to correct it.

[edit]user@host# show interfaces at-1/0/1.0encapsulation atm-ppp-llc;vci 0.120;
ppp-options {chap {access-profile pe-B-ppp-clients;local-name pe-A-at-1/0/1;}}
keepalives interval 5 up-count 6 down-count 4;
family inet {address 192.122.13.13/30;}

If you are done configuring the PPP logical subscriber interface on logical unit 0, enter commit from configuration mode.

Configuring the Static PPP Subscriber Interface on Logical Unit 1

Step-by-Step Procedure

To configure the static PPP subscriber interface on logical unit 1:

  1. Configure PPP-over-AAL5 VC multiplexing encapsulation on the logical interface.
    [edit interfaces at-1/0/1 unit 1]user@host# set encapsulation atm-ppc-vc-mux
  2. Configure the VCI for the logical interface.
    [edit interfaces at-1/0/1 unit 1]user@host# set vci 2.120
  3. Configure the transmission of keepalive messages on the logical interface.
    [edit interfaces at-1/0/1 unit 1]user@host# set keepalives interval 6user@host# set keepalives up-count 6user@host# set keepalives down-count 4
  4. Configure the IPv4 (inet) protocol family and IP address.
    [edit interfaces at-1/0/1 unit 1]user@host# set family inet address 192.122.14.13/30

Results

From the [edit] hierarchy level in configuration mode, confirm the results of the static PPP subscriber interface configuration on logical unit 1 by issuing the show interfaces at-1/0/1.1 command. If the output does not display the intended configuration, repeat the instructions in this example to correct it.

[edit]user@host# show interfaces at-1/0/1.1encapsulation atm-ppp-vc-mux;vci 2.120;keepalives interval 6 up-count 6 down-count 4;
family inet {address 192.122.14.13/30;}

If you are done configuring the PPP logical subscriber interface on logical unit 1, enter commit from configuration mode.

Configuring the Static PPP Subscriber Interface on Logical Unit 2

Step-by-Step Procedure

To configure the static PPP subscriber interface on logical unit 2:

  1. Configure PPP-over-AAL5 VC multiplex encapsulation on the logical interface.
    [edit interfaces at-1/0/1 unit 2]user@host# set encapsulation atm-ppc-vc-mux
  2. Configure the VCI for the logical interface.
    [edit interfaces at-1/0/1 unit 2]user@host# set vci 2.121
  3. Specify that you want to configure options for PPP CHAP on the logical interface.
    [edit interfaces at-1/0/1 unit 2]user@host# edit ppp-options chap
  4. Assign the previously configured pe-A-ppp-clients access profile to the PPP logical subscriber interface.
    [edit interfaces at-1/0/1 unit 2 ppp-options chap]user@host# set access-profile pe-A-ppp-clients
  5. Configure the local name used by the interface in CHAP challenge and response packets.
    [edit interfaces at-1/0/1 unit 2 ppp-options chap]user@host# set local-name “pe-A-at-1/0/1”
  6. Configure passive mode for CHAP authentication.
    [edit interfaces at-1/0/1 unit 2 ppp-options chap]user@host# set passiveuser@host# up
  7. Apply the previously configured pppoa-cos-profile dynamic profile to the PPP logical subscriber interface.
    [edit interfaces at-1/0/1 unit 2 ppp-options]user@host# set dynamic-profile pppoa-cos-profileuser@host# up
  8. Configure the transmission of keepalive messages on the logical interface.
    [edit interfaces at-1/0/1 unit 2]user@host# set keepalives interval 5user@host# set keepalives up-count 6user@host# set keepalives down-count 4
  9. Configure the IPv4 (inet) protocol family and IP address.
    [edit interfaces at-1/0/1 unit 2]user@host# set family inet address 192.122.15.13/30

Results

From the [edit] hierarchy level in configuration mode, confirm the results of the static PPP subscriber interface configuration on logical unit 2 by issuing the show interfaces at-1/0/1.2 command. If the output does not display the intended configuration, repeat the instructions in this example to correct it.

[edit]user@host# show interfaces at-1/0/1.2encapsulation atm-ppp-vc-mux;vci 2.121;
ppp-options {chap {access-profile pe-A-ppp-clients;local-name pe-A-at-1/0/1;passive;}dynamic-profile pppoa-cos-profile;}
keepalives interval 5 up-count 6 down-count 4;
family inet {address 192.122.15.13/30;}

If you are done configuring the PPP logical subscriber interface on logical unit 2, enter commit from configuration mode.

Verification

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

Verifying the ATM Physical Interface Configuration

Purpose

Verify that the at-1/0/1 physical interface is properly configured for use with ATM PVCs.

Action

From operational mode, issue the show interfaces at-1/0/1 command.

For brevity, this show command output includes only the configuration that is relevant to the at-1/0/1 physical interface. Any other configuration on the system has been replaced with ellipses (...).

user@host> show interfaces at-1/0/1
Physical interface: at-1/0/1, Enabled, Physical link is Down
  Interface index: 166, SNMP ifIndex: 593
  Link-level type: ATM-PVC, MTU: 2048, Clocking: Internal, SONET mode, Speed: OC3, Loopback: None, Payload scrambler: Enabled
  Device flags   : Present Running Down
  Link flags     : None
  CoS queues     : 8 supported, 8 maximum usable queues
  Schedulers     : 0
  Current address: 00:1f:12:bc:4a:96
  Last flapped   : 2012-06-29 15:35:29 PDT (2d 16:24 ago)
  Input rate     : 0 bps (0 pps)
  Output rate    : 0 bps (0 pps)
  SONET alarms   : LOL, LOS
  SONET defects  : LOL, LOS, LOP, BERR-SF, RDI-P
    VPI 0
      Flags: Active
      Total down time: 0 sec, Last down: Never
  Traffic statistics:
         Input  packets:                    0
         Output packets:                    0
    VPI 2
      Flags: Active
      Total down time: 0 sec, Last down: Never
  Traffic statistics:
         Input  packets:                    0
         Output packets:                    0

  ...

Meaning

ATM-PVC in the Link-level Type field indicates that encapsulation for ATM permanent virtual circuits is being used on ATM physical interface at-1/0/1. The Active flag for VPI 0 and VPI 2 indicates that these virtual paths are up and operational.

Verifying the Static PPPoA Configuration on Logical Unit 0

Purpose

Verify that the static PPP subscriber interface is properly configured on logical unit 0 (at-1/0/1.0).

Action

From operational mode, issue the show interfaces at-1/0/1.0 command.

user@host> show interfaces at-1/0/1.0
Logical interface at-1/0/1.0 (Index 337) (SNMP ifIndex 1979)
    Flags: Device-Down Point-To-Point Inverse-ARP SNMP-Traps 0x4000 Encapsulation: ATM-PPP-LLC
    Input packets : 0
    Output packets: 0
  Keepalive settings: Interval 5 seconds, Up-count 6, Down-count 4
  Keepalive: Input: 0 (never), Output: 0 (never)
  LCP state: Down
  NCP state: inet: Not-configured, inet6: Not-configured, iso: Not-configured, mpls: Not-configured
  CHAP state: Closed
  PAP state: Closed
    Protocol inet, MTU: 2034
      Flags: Sendbcast-pkt-to-re, Protocol-Down
      Addresses, Flags: Dest-route-down Is-Preferred Is-Primary
        Destination: 192.122.13.12/30, Local: 192.122.13.13, Broadcast: 192.122.13.15
    VCI 0.120
      Flags: Active, Inverse-ARP
      Total down time: 0 sec, Last down: Never
      ARP statistics
       Received: 0, Sent: 0, Denied: 0, Operation not supported: 0,
       Bad packet length: 0, Bad protocol: 0, Bad protocol length: 0,
       Bad hardware length: 0, Dropped: 0
       Last received: Never, Last sent: Never
        Input packets : 0
        Output packets: 0

Meaning

ATM-PPP-LLC in the Encapsulation field indicates that logical interface at-1/0/1.0 is properly configured for PPP-over-AAL5 logical link control (LLC) encapsulation. Protocol inet indicates that the IPv4 protocol family has been properly configured on the logical interface. The Active flag for VCI 0.120 indicates that virtual circuit identifier (VCI) 120 on VPI 0 is up and operational.

Verifying the Static PPPoA Configuration on Logical Unit 1

Purpose

Verify that the static PPP subscriber interface is properly configured on logical unit 1 (at-1/0/1.1).

Action

From operational mode, issue the show interfaces at-1/0/1.1 command.

user@host> show interfaces at-1/0/1.1
  Logical interface at-1/0/1.1 (Index 338) (SNMP ifIndex 1980)
    Flags: Device-Down Point-To-Point SNMP-Traps 0x4000 Encapsulation: ATM-PPP-VCMUX
    Input packets : 0
    Output packets: 0
  Keepalive settings: Interval 6 seconds, Up-count 6, Down-count 4
  Keepalive: Input: 0 (never), Output: 0 (never)
  LCP state: Down
  NCP state: inet: Not-configured, inet6: Not-configured, iso: Not-configured, mpls: Not-configured
  CHAP state: Closed
  PAP state: Closed
    Protocol inet, MTU: 2038
      Flags: Sendbcast-pkt-to-re, Protocol-Down
      Addresses, Flags: Dest-route-down Is-Preferred Is-Primary
        Destination: 192.122.14.12/30, Local: 192.122.14.13, Broadcast: 192.122.14.15
    VCI 2.120
      Flags: Active, Inverse-ARP
      Total down time: 0 sec, Last down: Never
      ARP statistics
       Received: 0, Sent: 0, Denied: 0, Operation not supported: 0,
       Bad packet length: 0, Bad protocol: 0, Bad protocol length: 0,
       Bad hardware length: 0, Dropped: 0
       Last received: Never, Last sent: Never
        Input packets : 0
        Output packets: 0

Meaning

ATM-PPP-VCMUX in the Encapsulation field indicates that the logical interface at-1/0/1.1 is properly configured for PPP-over-AAL5 VC multiplexing encapsulation. Protocol inet indicates that the IPv4 protocol family has been properly configured on the logical interface. The Active flag for VCI 2.120 indicates that virtual circuit identifier (VCI) 120 on VPI 2 is up and operational.

Verifying the Static PPPoA Configuration on Logical Unit 2

Purpose

Verify that the static PPP subscriber interface is properly configured on logical unit 2 (at-1/0/1.2).

Action

From operational mode, issue the show interfaces at-1/0/1.2 command.

user@host> show interfaces at-1/0/1.2
Logical interface at-1/0/1.2 (Index 339) (SNMP ifIndex 1981)
    Flags: Device-Down Point-To-Point SNMP-Traps 0x4000 Encapsulation: ATM-PPP-VCMUX
    Input packets : 0
    Output packets: 0
  Keepalive settings: Interval 5 seconds, Up-count 6, Down-count 4
  Keepalive: Input: 0 (never), Output: 0 (never)
  LCP state: Down
  NCP state: inet: Not-configured, inet6: Not-configured, iso: Not-configured, mpls: Not-configured
  CHAP state: Closed
  PAP state: Closed
    Protocol inet, MTU: 2038
      Flags: Sendbcast-pkt-to-re, Protocol-Down
      Addresses, Flags: Dest-route-down Is-Preferred Is-Primary
        Destination: 192.122.15.12/30, Local: 192.122.15.13, Broadcast: 192.122.15.15
    VCI 2.121
      Flags: Active
      Total down time: 0 sec, Last down: Never
        Input packets : 0
        Output packets: 0

Meaning

ATM-PPP-VCMUX in the Encapsulation field indicates that the logical interface at-1/0/1.2 is properly configured for PPP-over-AAL5 VC multiplexing encapsulation. Protocol inet indicates that the IPv4 protocol family has been properly configured on the logical interface. The Active flag for VCI 2.121 indicates that virtual circuit identifier 121 on VPI 2 is up and operational.

 

Related Documentation

 

Published: 2013-02-11

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