Point-to-Point Protocol (PPP) is a Layer 2 protocol that facilitates communications between two devices over Layer 1 links such as T1 and Ethernet, and can be used over ATM for ADSL links. PPP negotiations exchange transmit sizes, layer 3 protocol types, and layer 3 information. For a more detailed explanation of PPP, please consult the guide titled “Configuring and Troubleshooting PPP”.
To establish a PPP connection you will need a Layer 1 connection; such as a T1, ADSL or Ethernet. Be sure that your Layer 1 connection is free of errors before continuing with this setup.
Established T1, ADSL (ATM) or Ethernet Link
PPP Capable Peer
All versions of AOS are capable of negotiating PPP.
All AOS hardware is capable of negotiating PPP.
Basic Web Interface Configuration
This guide explains how to access the various types of PPP, and then how to configure PPP. Find the appropriate “accessing” section below, and then follow the “configuring ppp” section.
Accessing PPP over a T1, E1, Serial or DDS interface Configuration:
This guide assumes the T1 or E1 interface has already been configured and is ‘UP’.
1) Click “Physical Interfaces”
2) Click on the interface that will transport the PPP connection. (Example: T1 1/1)
3) Set the “Encapsulation Mode” to “PPP”.
4) Click Apply.
Accessing PPP over ATM for ADSL Configuration:
This guide assumes the ATM interface has already been created.
1) Click “Physical Interfaces” or “Public Interface” depending on your product.
a. After “Physical Interfaces” click “ATM 1” next to the ADSL interface. Then click “ATM 1.1” under “Configured Permanent Virtual Circuits”
2) Set “PPP” as the “Interface Mode”
3) Click Apply.
Accessing PPP over Ethernet Configuration:
This guide assumes the Ethernet Interface is configured and enabled.
1) Click “Physical Interfaces”, “Public Interface” or “VLANs” as your product requires.
a. If you are connecting a Switched interface to the PPPoE connection, click “VLANs”. (Example Product: 1224R), then click on the target VLAN.
b. After “Physical Interfaces” click the Ethernet interface over which PPP will be transported. (Example: eth 0/1)
2) Set “Interface Mode” to “PPPoE”.
3) Click Apply.
Configuring PPP in the Web Interface:
Depending on your Layer 1 interface type, your options may vary slightly.
1) If your provider requires authentication, select the appropriate type from “Sent Authentication Type”
a. Enter the appropriate username and password
b. You do not need to set the “Peer Authentication Type” if available.
2) Set the “Address Type” according to your providers requirements.
a. Negotiated – provider will dynamically assign an address
b. Static – You will manually enter an address
c. Unumbered – PPP interface will assume the address of the target interface
d. None – no address will be used; not likely
3) Click “Apply”.
Use the “Status for PPP..” box at the bottom of the PPP configuration page to view the status of the PPP connection.
Basic Command Line Interface Configuration
Access the Command Line via the Console Port or Telnet. The following commands will configure a PPP interface over a T1 interface or a Serial interface.
1) Enter enabled mode and enter the enable password if prompted.
a. Syntax: enable
b. Hostname> enable
2) Enter Global Configuration mode.
a. Syntax: configure terminal
b. Hostname#: configure terminal
3) Create the PPP interface with a unique identifying number.
a. Syntax: interface ppp <number>
b. Hostname(config)#: interface ppp 1
4) Assign the PPP Interface an IP Address.
a. Syntax: ip address <A.B.C.D> <subnetmask | /prefix-length>
b. Hostname(config-ppp 1)#: ip address 192.168.0.1 255.255.255.0
5) Cross-connect the interface with a Layer 1 interface (T1 and Serial shown)