Netgear M5300-28G-POE+ (GSM7228PSv1h2) - 12-Port Managed Gigabit Switch Softwarehandbuch
Routing Commands
773
M5300, M6100, and M7100 Series ProSAFE Managed Switches
nsf helper strict-lsa-checking (OSPF)
The restarting router is unable to react to topology changes. In particular, the restarting router
will not immediately update its forwarding table; therefore, a topology change may introduce
forwarding loops or black holes that persist until the graceful restart completes. By exiting the
graceful restart on a topology change, a router tries to eliminate the loops or black holes as
quickly as possible by routing around the restarting router. A helpful neighbor considers a link
down with the restarting router to be a topology change, regardless of the strict LSA checking
configuration.
will not immediately update its forwarding table; therefore, a topology change may introduce
forwarding loops or black holes that persist until the graceful restart completes. By exiting the
graceful restart on a topology change, a router tries to eliminate the loops or black holes as
quickly as possible by routing around the restarting router. A helpful neighbor considers a link
down with the restarting router to be a topology change, regardless of the strict LSA checking
configuration.
Use this command to require that an OSPF helpful neighbor exit helper mode whenever a
topology change occurs.
topology change occurs.
no nsf [ietf] helper strict-lsa-checking
Use this command to allow OSPF to continue as a helpful neighbor in spite of topology
changes.
changes.
OSPFv2 Stub Router Commands
max-metric router-lsa (OSPFv2 Router Configuration)
To configure OSPF to enter stub router mode, use this command in Router OSPF Global
Configuration mode. When OSPF is in stub router mode, as defined by RFC 3137, OSPF
sets the metric in the nonstub links in its router LSA to LsInfinity. Other routers therefore
compute very long paths through the stub router, and prefer any alternate path. Doing so
eliminates all transit traffic through the stub router, when alternate routes are available. Stub
router mode is useful when adding or removing a router from a network or to avoid transient
routes when a router reloads.
Configuration mode. When OSPF is in stub router mode, as defined by RFC 3137, OSPF
sets the metric in the nonstub links in its router LSA to LsInfinity. Other routers therefore
compute very long paths through the stub router, and prefer any alternate path. Doing so
eliminates all transit traffic through the stub router, when alternate routes are available. Stub
router mode is useful when adding or removing a router from a network or to avoid transient
routes when a router reloads.
You can administratively force OSPF into stub router mode. OSPF remains in stub router
mode until you take OSPF out of stub router mode. Alternatively, you can configure OSPF to
start in stub router mode for a configurable period of time after the router boots up.
mode until you take OSPF out of stub router mode. Alternatively, you can configure OSPF to
start in stub router mode for a configurable period of time after the router boots up.
Default
Enabled.
Format
nsf [ietf] helper strict-lsa-checking
Modes
OSPF Router Configuration
Parameter
Description
ietf
This keyword is accepted but not required.
Default
Enabled.
Format
nsf [ietf] helper strict-lsa-checking
Modes
OSPF Router Configuration