Reference Guide

1092 | Open Shortest Path First (OSPFv2)
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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 ( 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, FTOS 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
flood-2328 is enabled, this command configures FTOS to flood LSAs on all
interfaces.
graceful-restart grace-period
c e s
Specifies the time duration, in seconds, that the router’s neighbors will continue to
advertise the router as fully adjacent regardless of the synchronization state during a
graceful restart.
Syntax
graceful-restart grace-period seconds
To disable the grace period, enter no graceful-restart grace-period.
Parameters
Defaults
Not Configured
Command Modes
ROUTER OSPF
Command
History
seconds
Time duration, in seconds, that specifies the duration of the restart
process before OSPF terminates the process.
Range: 40 to 1800 seconds
Version 8.3.19.0 Introduced on S4820T
Version 8.3.7.0 Introduced on S4810
Version 7.8.1.0 Introduced for S-Series
Introduced support for Multi-Process OSPF.
Version 7.5.1.0 Introduced on C-Series
pre-Version 6.1.1.1 Introduced on E-Series