Damping; Figure 17 Next Entry Logic Example - Alcatel-Lucent 7705 Configuration Manual

Policy Statement
POL1
Entry 10
Match Criteria
Entry 20
Match Criteria
Entry 30
Match Criteria
Entry nn
Match Criteria

Damping

Damping initiates controls when routes flap. Route flapping can occur when an advertised
route between nodes alternates (flaps) back and forth between two paths due to network
problems that cause intermittent route failures. To limit processing requirements, the amount
of routing state change updates propagated must be reduced. Thus, when a route flaps beyond
a configured value (the suppress value), then that route is removed from the routing table and
routing protocols until the value falls below the reuse value.
A route can be suppressed according to the Figure of Merit (FoM) value. The FoM is a value
that is added to a route each time it flaps. A new route begins with an FoM value of 0.
7705 SAR OS Router Configuration Guide
Figure 17: Next Entry Logic Example
Policy Statement
POL2
Action: Entry 10
next-policy Match Criteria
METRIC:100
Action: Entry 20
next-policy Match Criteria
METRIC:200
Action: Entry 30
next-policy Match Criteria
METRIC:300
Action: Entry nn
next-policy Match Criteria
METRIC: nn
Policy Statement
POL3
Action:
Entry 10
next-policy
Match Criteria
Community:
A:B
Action:
Entry 20
next-policy
Match Criteria
Community:
C:D
Action:
Entry 30
next-policy
Match Criteria
Community:
E:F
Action:
Entry nn
next-policy
Match Criteria
Community:
Y-Z
Route Policies
Action:
next-policy
Local-Pref:
100
Action:
next-policy
Local-Pref:
200
Action:
next-policy
Local-Pref:
300
Action:
next-policy
Local-Pref:
nn
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