Brocade FastIron Ethernet Switch Layer 3 Routing Configura Manual de usuario Pagina 282

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Enabling and disabling NSR
To enable NSR for OSPF, enter the following commands:
device(config)# router ospf
device(config-ospf-router)# nonstop-routing
To disable NSR for OSPF, enter the following commands:
device(config)# router ospf
device(config-ospf-router)# no nonstop-routing
Syntax: [no] nonstop-routing
If you enter the graceful-restart command when NSR is already enabled, the command is rejected
with the following message: “Error - Please disable NSR before enabling Graceful Restart.”
Similarly, if you enter the nonstop-routing command when graceful restart is already enabled, the
command is rejected and the following message is displayed: “Error - Please disable Graceful Restart
before enabling NSR.”
To disable graceful-restart command, the following commands:
Brocade (config)# router ospf
Brocade (config-ospf-router)# no graceful-restart
Limitations of NSR
Following are the limitations of NSR:
Configurations that occur before the switchover are lost due to the CLI synchronization.
NSR does not support virtual link.
Changes in the neighbor state or interface state before or during a switchover do not take effect.
Traffic counters are not synchronized because the neighbor and LSA database counters are
recalculated on the standby module during synchronization.
LSA acknowledging is delayed because it has to wait until standby acknowledging occurs.
Depending on the sequence of redistribution or new LSAs (from neighbors), the LSAs accepted
within the limits of the database may change after switchover.
In NSR hitless failover, after switchover, additional flooding-related protocol traffic is generated to
the directly connected neighbors.
OSPF startup timers, database overflow, and max-metric, are not applied during NSR switchover.
Disabling configuration
To disable the route-map parameter from the configuration, enter the following command:
device(config-ospf-router)# no default-information-originate route-map defaultToOspf
The above CLI would retain the configuration with default-information-originate alone and the route-
map option would get reset or removed.
Enabling and disabling NSR
282 FastIron Ethernet Switch Layer 3 Routing Configuration Guide
53-1003087-04
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