Use the following fields to disable transit routing for SPF calculations,
configure OSPFv3 timers, and configure graceful restart for OSPFv3.
OSPFv3 – Advanced
Disable Transit Routing for SPF Calculation
Select if you want to set the R-bit in router
LSAs sent from this firewall to indicate that the firewall is not
active. When in this state, the firewall participates in OSPFv3
but other routers do not send transit traffic. In this state, local
traffic will still be forwarded to the firewall. This is useful
while performing maintenance with a dual-homed network because traffic
can be re-routed around the firewall while it can still be reached.
SPF Calculation Delay
—This is a delay timer allowing you to tune the
delay time between receiving new topology information and performing
an SPF calculation. Lower values enable faster OSPF re-convergence.
Routers peering with the firewall should be tuned in a similar manner
to optimize convergence times.
LSA Interval (sec)
—The option specifies
the minimum time between transmissions of two instances of the same
LSA (same router, same type, same LSA ID). This is equivalent to
MinLSInterval in RFC 2328. Lower values can be used to reduce re-convergence
times when topology changes occur.
Enable Graceful Restart
by default, a firewall enabled for this feature will instruct neighboring
routers to continue using a route through the firewall while a transition
takes place that renders the firewall temporarily down.
Enable Helper Mode
—Enabled by default,
a firewall enabled for this mode continues to forward to an adjacent
device when that device is restarting.
Enable Strict LSA Checking
by default, this feature causes an OSPF helper mode enabled firewall
to exit helper mode if a topology change occurs.
Grace Period (sec)
—The period of time,
in seconds, that peer devices continue to forward to this firewall
while adjacencies are being re-established or while the router is
being restarted (range is 5-1,800; default is 120).
Max Neighbor Restart Time
grace period, in seconds, that the firewall will accept as a help-mode
router. If the peer devices offers a longer grace period in its
grace LSA, the firewall will not enter helper mode (range is 5-800;
default is 140).