ON THIS PAGE
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:
MX Series 5G Universal Routing Platform
ATM MIC with SFP (Model Number MIC-3D-8OC3-2OC12-ATM) and compatible MPC1 or MPC2
Before you begin:
Make sure the MX Series router you are using has an ATM MIC with SFP installed and operational.
For information about compatible MPCs for the ATM MIC with SFP, see the MX Series Interface Module Reference.
For information about installing MPCs and MICs in an MX Series router, see the Hardware Guide for your MX Series router model.
Make sure you understand how to configure and use static ATM interfaces.
Create the dynamic profile (pppoa-cos-profile) and access profile (pe-B-ppp-clients) referenced in the configuration.
For information about creating a basic dynamic profile, see Configuring a Basic Dynamic Profile.
For information about creating a dynamic profile for class of service (CoS) attributes, see Configuring Traffic Scheduling and Shaping for Subscriber Access.
For information about creating an access profile for PPP Challenge Handshake Authentication Protocol (CHAP) authentication, see Configuring the PPP Challenge Handshake Authentication Protocol.
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, 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
- Configuring the ATM Physical Interface
- Configuring the Static PPP Subscriber Interface on Logical Unit 0
- Configuring the Static PPP Subscriber Interface on Logical Unit 1
- Configuring the Static PPP Subscriber Interface on Logical Unit 2
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 Interface set interfaces at-1/0/1 atm-options vpi 0 set interfaces at-1/0/1 atm-options vpi 2 # # Logical Unit 0 set interfaces at-1/0/1 unit 0 encapsulation atm-ppp-llc set interfaces at-1/0/1 unit 0 vci 0.120 set interfaces at-1/0/1 unit 0 ppp-options chap access-profile pe-B-ppp-clients set interfaces at-1/0/1 unit 0 ppp-options chap local-name pe-A-at-1/0/1 set interfaces at-1/0/1 unit 0 keepalives interval 5 set interfaces at-1/0/1 unit 0 keepalives up-count 6 set interfaces at-1/0/1 unit 0 keepalives down-count 4 set interfaces at-1/0/1 unit 0 family inet address 192.0.2.133/30 # # Logical Unit 1 set interfaces at-1/0/1 unit 1 encapsulation atm-ppp-vc-mux set interfaces at-1/0/1 unit 1 vci 2.120 set interfaces at-1/0/1 unit 1 keepalives interval 6 set interfaces at-1/0/1 unit 1 keepalives up-count 6 set interfaces at-1/0/1 unit 1 keepalives down-count 4 set interfaces at-1/0/1 unit 1 family inet address 192.0.2.143/30 # # Logical Unit 2 set interfaces at-1/0/1 unit 2 encapsulation atm-ppp-vc-mux set interfaces at-1/0/1 unit 2 vci 2.121 set interfaces at-1/0/1 unit 2 ppp-options chap access-profile pe-A-ppp-clients set interfaces at-1/0/1 unit 2 ppp-options chap local-name pe-A-at-1/0/1 set interfaces at-1/0/1 unit 2 ppp-options chap passive set interfaces at-1/0/1 unit 2 ppp-options dynamic-profile pppoa-cos-profile set interfaces at-1/0/1 unit 2 keepalives interval 5 set interfaces at-1/0/1 unit 2 keepalives up-count 6 set interfaces at-1/0/1 unit 2 keepalives down-count 4 set interfaces at-1/0/1 unit 2 family inet address 192.0.2.153/30
Configuring the ATM Physical Interface
Step-by-Step Procedure
To configure the ATM physical interface:
Specify that you want to configure ATM-specific options on the physical interface.
[edit interfaces at-1/0/1] user@host# edit atm-options
Configure one or more VPIs on the physical interface.
[edit interfaces at-1/0/1 atm-options] user@host# set vpi 0 user@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:
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
Configure the VCI for the logical interface.
[edit interfaces at-1/0/1 unit 0] user@host# set vci 0.120
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
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
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
Configure the transmission of keepalive messages on the logical interface.
[edit interfaces at-1/0/1 unit 0] user@host# set keepalives interval 5 user@host# set keepalives up-count 6 user@host# set keepalives down-count 4
Configure the IPv4 (
inet) protocol family and IP address.[edit interfaces at-1/0/1 unit 0] user@host# set family inet address 192.0.2.133/30
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-1/0/1.0
encapsulation 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 192.0.2.133/30;
}
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:
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
Configure the VCI for the logical interface.
[edit interfaces at-1/0/1 unit 1] user@host# set vci 2.120
Configure the transmission of keepalive messages on the logical interface.
[edit interfaces at-1/0/1 unit 1] user@host# set keepalives interval 6 user@host# set keepalives up-count 6 user@host# set keepalives down-count 4
Configure the IPv4 (
inet) protocol family and IP address.[edit interfaces at-1/0/1 unit 1] user@host# set family inet address 192.0.2.143/30
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-1/0/1.1
encapsulation atm-ppp-vc-mux;
vci 2.120;
keepalives interval 6 up-count 6 down-count 4;
family inet {
address 192.0.2.143/30;
}
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:
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
Configure the VCI for the logical interface.
[edit interfaces at-1/0/1 unit 2] user@host# set vci 2.121
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
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
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”
Configure passive mode for CHAP authentication.
[edit interfaces at-1/0/1 unit 2 ppp-options chap] user@host# set passive user@host# up
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-profile user@host# up
Configure the transmission of keepalive messages on the logical interface.
[edit interfaces at-1/0/1 unit 2] user@host# set keepalives interval 5 user@host# set keepalives up-count 6 user@host# set keepalives down-count 4
Configure the IPv4 (
inet) protocol family and IP address.[edit interfaces at-1/0/1 unit 2] user@host# set family inet address 192.0.2.153/30
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-1/0/1.2
encapsulation 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 192.0.2.153/30;
}
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
- Verifying the Static PPPoA Configuration on Logical Unit 0
- Verifying the Static PPPoA Configuration on Logical Unit 1
- Verifying the Static PPPoA Configuration on Logical Unit 2
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: 00:00:5e:00:53:96
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
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: 192.0.2.132/30, Local: 192.0.2.133, Broadcast: 192.0.2.135
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: 0Meaning
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
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: 192.0.2.142/30, Local: 192.0.2.143, Broadcast: 192.0.2.145
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: 0Meaning
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
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: 192.0.2.152/30, Local: 192.0.2.153, Broadcast: 192.0.2.155
VCI 2.121
Flags: Active
Total down time: 0 sec, Last down: Never
Input packets : 0
Output packets: 0Meaning
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.