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Cisco 819 Series Integrated Services Routers Software Configuration Guide
OL-23590-02
Chapter 8 Configuring the Serial Interface
Configuration Examples
When placed in asynchronous mode, low-speed serial interfaces support all commands available for
standard asynchronous interfaces. The default is synchronous mode.
Note When you use this command, it does not appear in the output of the show running-config and show
startup-config commands because the command is a physical-layer command.
To return to the default mode (synchronous) of a low-speed serial interface on a Cisco 2520 through
Cisco
2523 router, use the following command in interface configuration mode.
SUMMARY STEPS
1. no physical-layer
DETAILED STEPS
Configuration Examples
Interface Enablement Configuration: Examples
The following example illustrates how to begin interface configuration on a serial interface. It assigns
PPP encapsulation to serial interface 0.
interface serial 0
encapsulation ppp
The same example on the router, assigning PPP encapsulation to port 0 in slot 1, requires the following
commands:
interface serial 1/0
encapsulation ppp
The following example shows how to configure the access server so that it will use the default address
pool on all interfaces except interface 7, on which it will use an address pool called lass:
ip address-pool local
ip local-pool lass 172.30.0.1
async interface
interface 7
peer default ip address lass
Command or Action Purpose
Step 1
no physical-layer
Example:
Router(config-if)# no physical-layer
Returns the interface to its default mode, which is
synchronous.