Configuring PPP over a Serial Interface

Before you configure a PPP interface, configure the interface or tunnel over which PPP traffic will flow. The procedures described in this topic assume that a physical interface has been configured. See the following chapters for additional information:

To configure PPP over a serial interface:

  1. From Global Configuration mode, specify the physical interface on which you want to configure PPP.
    host1(config)#interface serial 3/0:2/5
  2. Specify PPP as the encapsulation method (data-link protocol) on the interface.
    host1(config-if)#encapsulation ppp
  3. Assign an IP address and subnet mask for the interface.
    host1(config-if)#ip address 192.168.22.10 255.255.255.0
  4. (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
  5. Verify that your configuration changes are correct.
    host1#show ppp interface serial 3/0:2/5 config

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