Cisco NCS 5500 Series

With warm standby process for each OSPF process running on the Active Route Processor, the corresponding
OSPF process must start on the Standby RP. There are no changes in configuration for this feature.
Warm-Standby is always enabled. This is an advantage for the systems running OSPFv3 as their IGP when
they do RP failover.
Enable Nonstop Routing for OSPFv3
This task describes how to enable nonstop routing (NSR) for OSPFv3 process. NSR is disabled by default.
When NSR is enabled, OSPF process on the active RP synchronizes all necessary data and states with the
OSPF process on the standby RP. When the switchover happens, OSPF process on the newly active RP has
all the necessary data and states to continue running and does not require any help from its neighbors.
SUMMARY STEPS
1. configure
2. router ospfv3 instance-id
3. nsr
4. commit
DETAILED STEPS
Step 1 configure
Step 2 router ospfv3 instance-id
Example:
RP/0/RP0/CPU0:router(config)# router ospfv3 isp
Enables OSPF routing for the specified routing process, and places the router in router configuration mode. In this example,
the OSPF instance is called isp.
Step 3 nsr
Example:
RP/0/RP0/CPU0:router(config-ospfv3)# nsr
Enables NSR for the OSPFv3 process.
Step 4 commit
OSPFv2OSPF SPF Prefix Prioritization
The OSPFv2 OSPF SPF Prefix Prioritization feature enables an administrator to converge, in a faster mode,
important prefixes during route installation.
When a large number of prefixes must be installed in the Routing Information Base (RIB) and the Forwarding
Information Base (FIB), the update duration between the first and last prefix, during SPF, can be significant.
In networks where time-sensitive traffic (for example, VoIP) may transit to the same router along with other
traffic flows, it is important to prioritize RIB and FIB updates during SPF for these time-sensitive prefixes.
Routing Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 6.3.x
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Implementing OSPF
Enable Nonstop Routing for OSPFv3