Table Of Contents

Bidirectional Forwarding Detection

Technology Description

Inventory and Information Model Objects (IMOs)

BFD Service (IBfdService)

BFD Session (IBfdSession)

Vendor-Specific Inventory and IMOs

Network Topology

Service Alarms

Bidirectional Forwarding Detection

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This chapter describes the level of support that Cisco ANA provides for Bidirectional Forwarding Detection (BFD), as follows:

•Technology Description

•Inventory and Information Model Objects (IMOs)

•Vendor-Specific Inventory and IMOs

•Network Topology

•Service Alarms

Technology Description

BFD provides rapid failure detection between forwarding engines while maintaining low overhead. It also provides a single, standardized method of link, device, or protocol failure detection at any protocol layer and over any media.

BFD can be used with the following protocols:

•BGP

•IS-IS

•EIGRP

•MPLS TE

•OSPF

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Note Currently, ANA supports BFD only when used in conjunction with BGP and OSPF.

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Inventory and Information Model Objects (IMOs)

This section includes the following IMOs:

•BFD Service (IBfdService)

•BFD Session (IBfdSession)

BFD Service (IBfdService)

The BFD Service IMO contains a list of BFD session objects (IBfdSession).

Table 17-1 BFD Service (IBfdService) 

Attribute Name	Attribute Description	Scheme	Polling Interval
Sessions	Returns a set of IBfdSession objects	Any	Configuration

BFD Session (IBfdSession)

The BFD Session IMO describes a single BFD session entry.

Table 17-2 BFD Session (IBfdSession) 

Attribute Name	Attribute Description	Scheme	Polling Interval
Source IP	Source IP address of the session	Any	Configuration
Destination IP	Destination IP address of the session	Any	Configuration
Interface OID	OID of the physical interface	Any	Configuration
Interval	The value of the requested interval	Any	Configuration
Multiplier	The value of the multiplier	Any	Configuration
State	The state of the session (Up or Down)	Any	Configuration
Protocol	The routing protocol, such as OSPF or BGP	Any	Configuration

Vendor-Specific Inventory and IMOs

There are no vendor-specific inventory or IMOs for this technology.

Network Topology

Cisco ANAdiscovers BFD topology by comparing the session parameters of potential BFD neighbors. In particular, it compares the source IP, the destination IP, and the network protocol on both sides.

Service Alarms

The following alarms are supported for this technology:

•BFD connectivity down

•BFD connectivity up

•BFD neighbor loss

•BFD neighbor found

The "BFD connectivity down" alarm is cleared by the "BFD connectivity up" alarm. The "BFD neighbor loss" alarm is cleared by the "BFD neighbor found" alarm.

For detailed information about alarms and correlation, see the Cisco Active Network Abstraction 3.6.6 User Guide.