Brocade FastIron Ethernet Switch Layer 3 Routing Configuration Guide - Manual (Page 282)

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
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