| Enable Graceful Restart —Enabled
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 —Enabled
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 —The maximum
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).
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