Configuration Tasks

The following procedure is an example of a PPP configuration on a serial interface. These steps are mandatory unless otherwise noted.

From Global Configuration mode, specify the physical interface on which you want to configure PPP.
host1(config)#interface serial 3/0:2/5
Specify PPP as the encapsulation method (data-link protocol) on the interface.
host1(config-if)#encapsulation ppp
Assign an IP address and subnet mask for the interface.
host1(config-if)#ip address 192.168.22.10 255.255.255.0

(Optional) Configure the packet over SONET (POS) interface on which PPP encapsulation is configured to transition to the up state only when the NCP packets are received in a sequence. If you configure this setting, the PPP sessions are not established if the NCP packets arrive in an out-of-order format. By default, the capability to establish PPP sessions only when the NCP packets arrive in a sequence is configured.

Note: This step applies only if you configure the physical interface in Step 1 of this procedure as a POS interface by using the interface pos command. Otherwise, it is not required to set the POS interfaces with PPP encapsulation with this option on sequencing of NCP packets.

host1(config)#ppp ncp-Ordering-Required

Verify that your configuration changes are correct.
host1#show ppp interface serial 3/0:2/5 config

encapsulation ppp

Use to configure PPP as the encapsulation method.
Example
host1(config-if)#encapsulation ppp
Use the no version to disable PPP on an interface.
See encapsulation ppp.

interface atm

Use to specify a previously configured ATM interface on which you want to configure PPP.
To specify an ATM interface for ERX7xx models, ERX14xx models, and ERX310 router, use the slot/port.[subinterface ] format.
- slot—Number of the chassis slot
- port—Port number on the I/O module
- subinterface—Number of the subinterface in the range 1–2147483647
To specify an ATM interface for E120 and E320 routers, use the slot/adapter/port[.subinterface ] format.
- slot—Number of the chassis slot
- adapter—Identifier for the IOA within the E320 chassis, either 0 or 1, where:
  - 0 indicates that the IOA is installed in the right IOA bay (E120 router) or the upper IOA bay (E320 router).
  - 1 indicates that the IOA is installed in the left IOA bay (E120 router) or the lower IOA bay (E320 router).
- port—Port number on the IOA
- subinterface—Number of the subinterface in the range 1–2147483647
For more information, see Creating a Basic Configuration in Configuring ATM .
Examples
host1(config-if)#interface atm 9/1.1 host1(config-if)#interface atm 5/0/1.1
Use the no version to disable or remove the subinterface or the logical interface.
See interface atm.

interface pos

Use to specify a previously configured packet over SONET (POS) interface on which you want to configure PPP.
To specify a POS interface for ERX7xx models, ERX14xx models, and ERX310 router, use the slot/port.[subinterface ] format.
- slot—Number of the chassis slot
- port—Port number on the I/O module
- subinterface—Number of the subinterface
To specify a POS interface for E120 and E320 routers, use the slot/adapter/port format.
- slot—Number of the chassis slot
- adapter—Identifier for the IOA within the E320 chassis, either 0 or 1, where:
  - 0 indicates that the IOA is installed in the right IOA bay (E120 router) or the upper IOA bay (E320 router).
  - 1 indicates that the IOA is installed in the left IOA bay (E120 router) or the lower IOA bay (E320 router).
- port—Port number on the IOA
For more information about modules that support POS interfaces, see Configuring Unchannelized OCx/STMx Interfaces in JunosE Physical Layer Configuration Guide.
Examples
host1(config-if)#interface pos 0/1 host1(config-if)#interface pos 5/0/0
Use the no version to remove the POS interface.
See interface pos.

interface serial

Use to specify a serial interface in the slot/port:channel/subchannel format by selecting a previously configured physical interface on which you want to configure PPP.
- slot—Refers to a router chassis slot.
- port—Refers to a CT3, T3, or E3 module I/O port.
- channel—Refers to a T1 (DS1) channel.
- subchannel—Represents a set of DS0 subchannels.
Example
host1(config)#interface serial 3/0:2/5
Use the no version to disable or remove the subinterface or the logical interface.
See interface serial.

ip address

Use to assign an IP address and subnet mask for a PPP interface.
Example
host1(config-if)#ip address 192.168.22.10 255.255.255.0
Use the no version to remove an IP address or disable IP processing.
See ip address.