Cisco ASR 9000 Series Configuration Manual

Configuring Serial Interfaces on the Cisco ASR 9000 Series Router
Information About Configuring Serial Interfaces
506
Cisco ASR 9000 Aggregation Services Router Interfaces and Hardware Component Configuration Guide
OL-26061-03
Table 20 provides a high-level overview of the tasks required to configure a T3 serial interface on the
1-Port Channelized OC-48/STM-16 SPA
Cisco HDLC Encapsulation
Cisco High-Level Data Link Controller (HDLC) is the Cisco proprietary protocol for sending data over
synchronous serial links using HDLC. Cisco HDLC also provides a simple control protocol called Serial
Line Address Resolution Protocol (SLARP) to maintain serial link keepalives. HDLC is the default
encapsulation type for serial interfaces under Cisco IOS XR software. Cisco HDLC is the default for
data encapsulation at Layer 2 (data link) of the Open System Interconnection (OSI) stack for efficient
packet delineation and error control.
Note Cisco HDLC is the default encapsulation type for the serial interfaces.
Cisco HDLC uses keepalives to monitor the link state, as described in the “Keepalive Timer” section on
page 508.
Note Use the debug chdlc slarp packet command to display information about the Serial Line Address
Resolution Protocol (SLARP) packets that are sent to the peer after the keepalive timer has been
configured.
PPP Encapsulation
PPP is a standard protocol used to send data over synchronous serial links. PPP also provides a Link
Control Protocol (LCP) for negotiating properties of the link. LCP uses echo requests and responses to
monitor the continuing availability of the link.
Note When an interface is configured with PPP encapsulation, a link is declared down, and full LCP
negotiation is re-initiated after five ECHOREQ packets are sent without receiving an ECHOREP
response.
PPP provides the following Network Control Protocols (NCPs) for negotiating properties of data
protocols that will run on the link:
Table 20 Overview: Configuring a Serial Interface on a T3 Channel
Step Task Module Section
1. Configure the SONET controller
parameters and STS stream.
“Configuring Channelized
SONET/SDH on the
Cisco ASR 9000 Series Router”
Configuring a Clear Channel SONET
Controller for T3
2. Configure the STS stream mode for
T3 and configure the T3 controller
parameters.
“Configuring Channelized
SONET/SDH on the
Cisco ASR 9000 Series Router”
Configuring a Clear Channel SONET
Controller for T3
3. Configure the Serial interfaces. “Configuring Serial Interfaces on
the
Cisco ASR 9000 Series Router”
How to Configure Serial Interfaces

Cisco ASR 9000 Series Specifications

General

Brand	Cisco
Model	ASR 9000 Series
Category	Network Router
Language	English