Cisco Systems Version 3.6 Service Pack 1 Manuel d'utilisateur télécharger pdf (Page 17)

CHAPTER

2-1

Cisco Active Network Abstraction Fault Management User Guide, Version 3.6 Service Pack 1

OL-14284-01

Fault Detection and Isolation

This chapter describes unreachable network elements and the sources of alarms on devices. In addition,

it describes alarm integrity and the integrity service:

• Unreachable Network Elements—Describes how the various VNEs use reachability to check

connectivity with the NEs.

• Sources of Alarms On a Device—Describes the four basic alarm sources that indicate problems in

the network.

• Alarm Integrity—Describes what happens when a VNE with associated open alarms shuts down.

• Integrity Service—Describes the integrity service tests that run on the gateway and/or the units.

Unreachable Network Elements

Reachability used by the VNEs (checks the reachability between the VNEs and NEs) depends on the

configuration of the VNE, and involves multiple connectivity tests, using SNMP, Telnet/SSH and/or

ICMP, as appropriate.

The table describes the various situations below when a NE fails to respond to the protocols:

Table 2-1 Unreachable Network Elements

VNE Type Checks reachability using When the NE fails to respond When the NE is reachable

ICMP VNE ICMP only. During the ICMP

test the unit pings the NE

every configured interval.

ICMP ping is suspended, and a VNE

Unreachable alarm is sent to the

Cisco ANA Gateway. Only the

reachability tests are executed thereafter to

detect when the device is reachable again.

ICMP ping is restarted, and the

alarm is cleared.

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Cisco Systems Version 3.6 Service Pack 1 Manuel d'utilisateur Page 17