Administrator Guide

fast-convergence
This command sets the minimum LSA origination and arrival times to zero (0), allowing more rapid route computation so that
convergence takes less time.
Syntax
fast-convergence {number}
To cancel fast-convergence, use the no fast convergence command.
Parameters
number Enter the convergence level desired. The higher this parameter is set, the faster
OSPF converge takes place. The range is from 1 to 4.
Defaults None.
Command Modes ROUTER OSPF
Command
History
This guide is platform-specific. For command information about other platforms, see the relevant Dell
EMC Networking OS Command Line Reference Guide.
Version Description
9.10(0.1) Introduced on the S6010-ON and S4048T-ON.
9.10(0.0) Introduced on the S3148.
9.10(0.0) Introduced on the S6100-ON.
9.8(2.0) Introduced on the S3100 series.
9.8(1.0) Introduced on the Z9100-ON.
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.7(0.0) Introduced on the S6000-ON.
9.2(1.0) Introduced on the Z9500.
9.0.2.0 Introduced on the S6000.
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.3.7.0 Introduced on the S4810.
7.8.1.0 Introduced on all platforms.
Usage
Information
The higher this parameter is set, the faster OSPF converge takes place.
NOTE: The faster the convergence, the more frequent the route calculations and updates. This
behavior impacts CPU utilization and may impact adjacency stability in larger topologies.
Generally, convergence level 1 meets most convergence requirements. Higher convergence levels should
only be selected following consultation with Dell EMC Networking technical support.
graceful-restart grace-period
Specifies the time duration, in seconds, that the router’s neighbors continue to advertise the router as fully adjacent regardless
of the synchronization state during a graceful restart.
NOTE:
This command enables OSPFv2 graceful restart globally by setting the grace period (in seconds) that an OSPFv2
router’s neighbors continues to advertise the router as adjacent during a graceful restart.
Syntax
graceful-restart grace-period seconds
1054 Open Shortest Path First (OSPFv2 and OSPFv3)