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Configuring OSPF
Enterasys Matrix DFE-Gold Series Configuration Guide
21-19
Configuring OSPF
Understanding Graceful Restart
OSPF
graceful
restart,
sometimes
referred
to
as
non
‐
stop
forwarding,
provides
for
an
OSPF
router
to
remain
on
the
forwarding
path
during
a
restart
of
its
OSPF
software.
Graceful
‐
restart
has
four
elements
to
its
configuration:
enabling,
helper
router,
restart
interval,
and
strict
LSA
checking.
Enabling
graceful
restart
instructs
the
firmware
to
perform
a
graceful
restart,
rather
than
a
standard
OSPF
restart.
Restart
is
only
initiated
by
a
fail
‐
over.
Grace
LSAs
are
sent
when
OSPF
is
restarted
on
another
module.
Whether
the
failover
is
intentional
or
not,
the
failed
router
protocol
is
restarted
on
another
module,
and
upon
startup,
OSPF
sends
grace
LSAs
out
to
its
neighbors
using
existing
link
aggregation
groups.
Use
the
graceful
‐
restart
enable
command
to
enable
the
graceful
restart
ability
on
this
router.
The
helper
relationship
with
the
restarting
router
is
on
a
per
network
segment
basis.
The
helper
monitors
the
network
for
topology
changes.
If
no
changes
occur,
the
helper
router
continues
to
advertise
its
LSAs
as
though
no
restart
was
occurring.
If
the
restarting
router
was
the
designated
router,
the
helper
continues
to
treat
it
as
such.
If
a
topology
change
does
occur,
graceful
restart
is
terminated
on
the
restarting
router
and
a
standard
restart
occurs.
Helper
mode
can
be
disabled
on
a
restarting
router
neighbor
using
the
graceful
‐
restart
helper
‐
disabled
command.
If
the
restarting
router
receives
an
LSA
indicating
a
disabled
helper,
the
graceful
restart
terminates
and
a
standard
restart
occurs.
A
restart
interval
provides
for
a
maximum
time
in
seconds
after
which
the
graceful
restart
will
terminate
should
it
not
complete
or
terminate
for
other
reasons
within
the
interval.
Use
the
graceful
‐
restart
restart
‐
interval
command
to
change
the
restart
interval
setting.
Strict
LSA
checking
assures
that
graceful
restart
will
terminate
if
there
is
a
change
to
an
LSA
that
would
be
flooded
to
the
restarting
router.
Strict
LSA
checking
can
be
disabled.
If
disabled,
a
change
to
an
LSA
that
would
be
flooded
to
the
restarting
router
will
not
cause
the
graceful
restart
to
terminate.
Use
the
graceful
‐
restart
strict
‐
lsa
‐
checking
‐
disabled
command
to
disable
strict
LSA
checking.
View
the
router
OSPF
section
of
the
show
running
‐
config
display
to
verify
any
non
‐
default
graceful
restart
settings.
Graceful Restart and High Availability
The
DFE
supports
single
router
high
availability
failover
using
the
following
components:
•
OSPF
graceful
restart
•
Non
‐
stop
router
frame
forwarding
on
each
module
•
Single
router
configuration
•
Router
protocol
process
failover
to
another
module
•
Link
Aggregate
Group
(LAG)
connectivity
to
neighboring
routers
The
DFE
is
a
distributed
routing
system.
The
routing
protocol
process
resides
on
a
single
router
module.
Information
such
as
access
list
rules,
policy
routing
rules,
interface
configuration
and
best
routes
are
calculated
by
the
protocol
process
and
distributed
to
all
modules.
Each
module
has
its
Important Notice
OSPF is an advanced routing feature that must be enabled with a license key. If you have purchased an
advanced license key, and have enabled routing on the device, you must activate your license as described
back in “
Activating Licensed Features
” on page 2-58
in order
to enable the OSPF command set. If you wish to
purchase an advanced routing license, contact Enterasys Networks Sales.
Содержание Enterasys Matrix DFE-Gold Series
Страница 1: ...P N 9033933 15 Enterasys Matrix DFE Gold Configuration Guide Firmware Version 6 11 xx...
Страница 2: ......
Страница 40: ...Getting Help xxxviii About This Guide...
Страница 148: ...Reviewing and Configuring Routing router 2 106 Startup and General Configuration...
Страница 300: ...Configuring SNMP Walk Behavior set snmp timefilter break 5 42 SNMP Configuration...
Страница 378: ...Configuring Spanning Tree Loop Protect Features show spantree nonforwardingreason 6 78 Spanning Tree Configuration...
Страница 456: ...Configuring Policy Based Routing ip policy pinger 8 50 Policy Classification Configuration...
Страница 576: ...Configuring NetFlow clear netflow template 15 12 NetFlow Configuration...
Страница 610: ...Configuring Debug IP Packet no debug ip packet 16 34 IP Configuration...
Страница 640: ...Configuring Network Address Translation NAT clear router limits NAT 18 18 Network Address Translation NAT Configuration...
Страница 676: ...Configuring Load Sharing Network Address Translation LSNAT clear router limits LSNAT 19 36 LSNAT Configuration...
Страница 804: ...TWCB Configuration Example clear router limits TWCB 23 22 Transparent Web Cache Balancing Configuration...
Страница 922: ...Understanding RADIUS Snooper show radius snooping session 26 12 RADIUS Snooping Configuration...
Страница 940: ...Configuring Multiple Authentication show multiauth trap 27 18 MultiAuth Configuration...
Страница 944: ...Index 4...