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PPP Commands
encapsulation ppp
This command sets the Point‐to‐Point Protocol (PPP) as the encapsulation method used by a serial
port. To use PPP encapsulation, the XSR must be configured with an IP routing protocol.
Syntax
encapsulation ppp
Syntax of the "no" Form
no encapsulation ppp
Default
No encapsulation
Mode
Interface configuration:
Example
The following example enables PPP encapsulation on Serial interface 1/0:
XSR(config)#interface serial 1/0
XSR(config-if<S1/0>)#encapsulation ppp
interface
This command selects a physical or virtual port for configuration as a router interface. The XSR
supports ATM, BRI, Dialer, Fast/GigabitEthernet, Loopback, Multilink, Serial, or VPN interfaces.
For configuration purposes, all serial ports and T1/E1/ISDN‐PRI channel groups are treated as a
serial interface.
Optionally, you can set up the Console port on the XSR 1800 series as a WAN interface for dial
backup purposes (refer to the Caution below). Do so by entering
8-84 Configuring the Point-to-Point Protocol
Note: If encapsulation is changed from one type to another, all related values of the current
encapsulation and any sub-interface settings are deleted. Also, once encapsulation is set on an
interface, any sub-interface of that port created later is automatically encapsulated. Finally, you must
first enter the no encapsulation command to change the encapsulation type.
XSR(config-if<xx>)
Caution: Be aware that when you enable the Console port as a WAN port, you can no longer
directly connect to it because it is in data communication mode. Your only access to the CLI will be
to Telnet to an IP address of a configured port. Also, if your startup-config file does not configure
any ports properly and sets up the console port as a serial interface, you will no longer be able to
login and will have to press the Default button to erase your configuration. For details about
configuring the Console with a modem, see "Chapter 2: Managing the XSR" in the XSR User's
Guide.
0
only.
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