Cisco Systems network hardware 3.6 Manual

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Cisco Systems network hardware 3.6
4-11
Cisco Active Network Abstraction Fault Management User Guide, Version 3.6 Service Pack 1
OL-14284-01
Chapter 4 Advanced Correlation Scenarios
Multi Route Correlation
Multi Route Correlation
The correlation mechanism supports multi route scenarios, thereby eliminating false correlation, and
guaranteeing that the correct root cause alarm is reported.
The correlation mechanism ensures that if multi-route segments exist then all the alarms found on a
certain path (after eliminating invalid paths) are collected into an alarm set. These alarm sets are input
into a multi route filtering algorithm which eliminates irrelevant alarms from these sets, and outputs the
potentially root cause alarms. The root-cause alarm is determined from this group.
Multi Route Correlation Example 1
In this example, a link went down in the multi route segment between P1 and P4, and another link went
down in the single route segment between P6 and PE2. As a result, CE1 lost connectivity to its
management port, and became unreachable.
Figure 4-10 Multi Route Correlation Example 1
In this case the system will provide the following report:
• Root cause—Device Unreachable. Link Down #2 is identified as the root-cause for Device
Unreachable (CE1).
Note Link Down #1 is not the root-cause of the alarm because after it occurs there is still an alternative route
from CE1 to its management port.
Multi Route Correlation Example 2
In this example, there are traffic engineering routes (RSVP) from router CE2, so that CE2 can reach P1
through only three possible paths, namely:
• CE2->PE3->P7->P8->P1
• CE2->PE3->P8->P1
• CE2->PE3->P7->P1
Several links went down, and as a result, router CE2 became unreachable.
Device
unreachable
CE1 PE1 P1
P4
P2 P3
P5
P6 PE2
Link down
#1
Link down
#2
MNG core MNG core
182428
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