User Manual Cisco Systems Network Hardware 3.6 [41/68 Pages]

Cisco Systems network hardware 3.6

4-17

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

OL-14284-01

Chapter 4 Advanced Correlation Scenarios

BGP Process Down Alarm

The BGP process down alarm is issued when the BGP process is shut down on a device. If a BGP process

is shutdown on a device, the BGP neighbor down events will correlate to it as well as all the device

unreachable alarms from the CE devices that lost connectivity to the VRF due to the BGP process down

on the route reflector. The syslogs that the device issues expedite the status check of the BGP process

and BGP neighbors.

MPLS Interface Removed Alarm

The MPLS interface removed alarm is issued when a MPLS IP interface is removed and there is no

MPLS TE tunnel on the same interface. In addition, this may lead to two black holes on either side and

MPLS black hole found alarms may be issued. The black holes will send a flood message to the PEs and

check for any broken LSPs, and broken LSP discovered alarms may be issued. The MPLS black hole

found and broken LSP discovered alarms are correlated to the MPLS interface removed alarm. The

syslogs that the device issues expedite the status check of the label switching table and MPLS status.

LDP Neighbor Down Alarm

The "LDP neighbor down" alarm is issued if a session to an LDP neighbor goes down. This can happen

as the result of a failure in the TCP connection used by the LDP session, or if the interface is no longer

running MPLS. The “LDP neighbor down” alarm is cleared by a corresponding “LDP neighbor up”

alarm.

The alarm is issued when a peer is removed from the table in the LDP Neighbours tab. The alarm runs a

correlation flow to detect what event happened in the network core, and then performs a Root Cause

Analysis to find its root cause. The alarm initiates an IP based flow towards the “Peer Transport Address"

destination. If an alarm is found during the flow, it will correlate to it.

Note The "LDP neighbor down" alarm can correlate to the “MPLS interface removed" alarm. See MPLS

Interface Removed Alarm, page 4-17.