Chapter5 Configuring WAN Connections
Configuring a DSL Connection
5-18
Cisco Router and Security Device Manager 2.5 User’s Guide
OL-4015-12
PVC
ATM routing uses a two-layer hierarchical scheme, virtual paths and virtual
channels, denoted by the virtual path identifier (VPI) and virtual channel
identifier (VCI), respectively. A particular virtual path may carry a number of
different virtual channels corresponding to individual conn ections. When
switching is performed based on the VPI, all cells on that particular virtual path
are switched regardless of the VCI. An ATM switch may route according to VCI,
VPI, or both VCI and VPI.
Encapsulations Available for Serial Interfaces
Frame Relay Provides Frame Relay encapsulation. This option is available when
you have selected a serial interface. A serial subinterface will be
created when you create a Frame Relay connection. This
subinterface will be visible in the Summary window.
Note If a Frame Relay serial connection has been added to an
interface, only Frame Relay encapsulation will be enabled
in this window when subsequent serial connections are
configured on the same interface.
Point-to-Point Protocol Provides PPP encapsulation. This option is available when you have
selected a serial interface.
High Level Data Link Control Provides HDLC encapsulation. This option is available when you
have selected a serial interface.
Table5-13 Encapsulation Fields
Element Description