All IP Interfaces Down Alarm

Chapter 4 Advanced Correlation Scenarios

IP Interface Failure Scenarios

Where there is a multipoint setup and only some circuits under an IP interface go down, and this does not cause the state of the IP interface to change to down, then no “ip interface status down” alarm is created. All the circuit down syslogs correlate by flow to the possible root cause, for example, Device unreachable on a customer edge (CE) device.

•When all the IP interfaces configured above a physical interface change their state to down, the All ip interfaces down alarm is sent.

•When at least one of the IP interfaces changes its state to up, a clearing (active ip interfaces found) alarm is sent.

•The ip interface status down alarm for each of the failed IP interfaces is correlated to the All ip interfaces down alarm.

Note When an All ip interfaces down alarm is cleared by the active ip interfaces down alarm but there are still correlated ip interface status down alarms for some IP interfaces, the severity of the parent ticket is the highest severity among all the correlated alarms. For example, if there is an uncleared interface status down alarm, the severity of the ticket remains major, despite the fact that the Active ip interfaces found alarm has a cleared severity.

Table 4-2	All IP Interfaces Down

Name		Description	Ticketable	Correlation allowed	Correlated to	Severity

All ip interfaces		Sent when all the IP interfaces	Yes	Yes	Link	Major
down/Active ip		configured above a physical port			Down/Configuration
interfaces found		change their oper status to down			Change

The All ip interfaces down alarm is sourced to the Layer1 component. All alarms from “the other side”, for example, device unreachable correlate to the All ip interfaces down alarm.

IP Interface Failure Examples

Note In all the examples that follow it is assumed that the problems that result in the unmanaged cloud, or the problems that occurred on the other side of the cloud (for example, an unreachable CE device from a provider edge (PE) device) cause the relevant IP interfaces’ state to change to down. This in turn causes the ip interface status down alarm to be sent.

If this is not the case, as in some Ethernet networks, and there is no change to the state of the IP interface, all the events on the subinterfaces that are capable of correlation flow will try to correlate to other possible root causes, including “cloud problem”.

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

	OL-14284-01	4-5

3.6 specifications

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