Reference Guide

Open Shortest Path First (OSPFv2) | 1061
Command
History
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
Version 8.3.7.0 Introduced on S4810
Version 7.8.1.0 Introduced support for Multi-Process OSPF.
Version 7.6.1.0 Introduced on S-Series
Version 7.5.1.0 Introduced on C-Series and E-Series
seconds
Time duration, in seconds, that specifies the duration of the restart
process before OSPF terminates the process.
Range: 40 to 1800 seconds
Version 8.3.7.0 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