CLI Guide

Command Modes ROUTER OSPF
Command
History
This guide is platform-specific. For command information about other platforms, refer to the relevant Dell
EMC Networking OS Command Line Reference Guide.
The following is a list of the Dell EMC Networking OS version history for this command.
Version Description
9.10(0.1) Introduced on the S6010-ON and S4048T-ON.
9.10(0.0) Introduced on the S6100-ON.
9.8(1.0) Introduced on the Z9100-ON.
9.8(0.0) Introduced on the S3048-ON and S4048-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 Added support for Multi-Process OSPF.
7.6.1.0 Introduced on the S-Series.
7.5.1.0 Introduced on the C-Series and E-Series.
Usage
Information
In OSPF, flooding is the most resource-consuming task. The flooding algorithm, described in RFC-2328,
requires that OSPF flood LSAs (Link State Advertisements) on all interfaces, as governed by LSA’s
flooding scope (see Section 13 of the RFC). When multiple direct links connect two routers, the
RFC-2328 flooding algorithm generates significant redundant information across all links.
By default, Dell EMC Networking OS implements an enhanced flooding procedure that dynamically and
intelligently determines when to optimize flooding. Whenever possible, the OSPF task attempts to reduce
flooding overhead by selectively flooding on a subset of the interfaces between two routers.
When you enable flood-2328, this command configures Dell EMC Networking OS to flood LSAs on all
interfaces.
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
To disable the grace period, use the no graceful-restart grace-period command.
Parameters
seconds Time duration, in seconds, that specifies the duration of the restart process before
OSPF terminates the process. The range is from 40 to 1800 seconds.
Defaults Not Configured
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.
1060 Open Shortest Path First (OSPFv2 and OSPFv3)