Table Of Contents

Point-to-Point Protocol (PPP) and High Level Data Link Control (HDLC)

Technology Description

PPP

HDLC

Inventory and Information Model Objects (IMOs)

Point To Point Protocol Encapsulation

High Level Data Link Control Encapsulation

Network Topology

Service Alarms

Point-to-Point Protocol (PPP) and High Level Data Link Control (HDLC)

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This chapter describes the level of support that Cisco ANA provides for PPP and HDLC, as follows:

•Technology Description

•Inventory and Information Model Objects (IMOs)

•Network Topology

•Service Alarms

Technology Description

PPP

The Point-to-Point Protocol (PPP) (RFC 1661) originally emerged as an encapsulation protocol for transporting IP traffic over point-to-point links. PPP also established standards for the assignment and management of IP addresses, Octet Synchronous (Asynchronous) encapsulation, use of an HDLC-like framing (RFC 1662) protocol, Bit Synchronous encapsulation, use of HDLC protocols, network Protocol Multiplexing, Link Configuration, Link Quality Testing, Error Detection, and option negotiation for such capabilities as Network Layer Address and Data Compression negotiation.

PPP supports these functions by providing an extensible Link Control Protocol (LCP) and a family of Network Control Protocols (NCPs) to negotiate optional configuration parameters and facilities.

HDLC

High-level Data Link Control (HDLC) is a group of Data Link Layer (Layer 2) protocols used to transmit synchronous data packets between point-to-point nodes. In HDLC, data is organized into addressable frames. This format has been used for other multipoint-to-multipoint protocols, and inspired the HDLC-like framing protocol described in RFC 1662.

HDLC uses a zero-insertion/deletion process (bit stuffing) to ensure that the bit pattern of the delimiter flag does not occur in the fields between flags. The HDLC frame is synchronous and therefore relies on the Physical Layer (Layer 1) to clock and synchronize frame transmission and reception.

Inventory and Information Model Objects (IMOs)

This section describes the following IMOs:

•Point To Point Protocol Encapsulation (IVcBasedEncapsulation)

•High Level Data Link Control Encapsulation (IEncapsulation)

Point To Point Protocol Encapsulation

The following Data Link layer Point To Point Protocol Encapsulation object is bound by its Containing Termination Points attribute to an ATM/Frame Relay VC Multiplexer object. It is accessed primarily by a Network layer, such as the IP Interface bound by its Contained Connection Termination Points attribute.

Table 7-1 Point To Point Protocol Encapsulation (IVcBasedEncapsulation)

Attribute Name	Attribute Description	Scheme	Polling Interval
Virtual Connection	Virtual connection if applicable (ATM Virtual Connection, Frame Relay Virtual Connection or Virtual LAN Interface)	Any	Configuration
Binding Information	Binding information (User Name, ...)	Any	Configuration
Binding Status	Binding status (Not Bound, Bound)	Any	Configuration
IANA Type	IANA type of the sublayer	N/A	N/A
Containing Termination Points	Underlying termination points (connection or physical)	Any	N/A
Contained Connection Termination Points	Bound Connection Termination Points	Any	N/A

High Level Data Link Control Encapsulation

The following Data Link layer High Level Data Link Control Encapsulation (HDLC) object is bound by its Containing Termination Points attribute to an ATM/ Frame Relay VC Multiplexer object. It is accessed primarily by a Network layer, such as the IP Interface bound by its Contained Connection Termination Points attribute.

Table 7-2 High Level Data Link Control Encapsulation (IEncapsulation) 

Attribute Name	Attribute Description	Scheme	Polling Interval
Binding Information	Binding information (User Name, ...)	Any	Configuration
Binding Status	Binding status (Not Bound, Bound)	Any	Configuration
IANA Type	IANA type of the sublayer	N/A	N/A
Containing Termination Points	Underlying termination points (connection or physical)	Any	N/A
Contained Connection Termination Points	Bound Connection Termination Points	Any	N/A

Network Topology

Cisco ANA performs discovery of Point to Point Protocol (PPP) and High-level Data Link Control (HDLC) topologies by searching for the existence of the local IP Subnet in any one-hop-away remote sides of the PPP or HDLC interfaces, respectively. In particular, it compares the local and remote IP subnets gathered from the upper IP Network layers.

Service Alarms

There are no faults and alarms related to this technology.

For detailed information about alarms and correlation, see the Cisco Active Network Abstraction 3.6.5 User Guide.