Specifications

Overview of Dial Interfaces, Controllers, and Lines
Line Types
DC-16
Cisco IOS Dial Technologies Configuration Guide
For example, to enable IP resources to dial in to a network through a Cisco 2500 series access server,
configure the lines and asynchronous interfaces as follows.
• Configure the physical aspect of a line that leads to a port. You might enter the following commands
to configure lines 1 through 16 (asynchronous physical terminal lines on a Cisco 2511 access
server):
line 1 16
login local
modem inout
speed 115200
flowcontrol hardware
! Configures the line to autosense PPP; physical line attribute.
autoselect ppp
• On asynchronous interface 1, you configure your protocol-specific commands. You might enter the
following commands:
interface async 1
encapsulation ppp
async mode interactive
async dynamic address
async dynamic routing
async default ip address 192.168.16.132
ppp authentication chap
The remote node services SLIP, PPP, and XRemote are configured in asynchronous interface mode. ARA
is configured in line configuration mode on virtual terminal lines or physical terminal lines.
Synchronous Interfaces and Virtual Terminal Lines
Virtual terminal lines provide access to the router through a synchronous interface. Virtual terminal lines
do not correspond to synchronous interfaces in the same way that physical terminal lines correspond to
asynchronous interfaces because vty lines are created dynamically on the router, whereas physical
terminal lines are static physical ports. When a user connects to the router on a vty line, that user is
connecting into a virtual port on an interface. You can have multiple virtual ports for each synchronous
interface.
For example, several Telnet connections can be made to an interface (such as an Ethernet or serial
interface).
The number of virtual terminal lines available on a router is defined using the line vty number-of-lines
global configuration command.