Configuring a NSSA with the no-summary option specifies that the router will neither originate nor propagate summary LSAs into the NSSA, and will, instead, depend entirely on its default route. You can specify the no-summary option only in ABRs.
This example configures area 0.0.0.6 as an NSSA in SEFOS1 (router ID 10.0.0.1), with no summary LSAs being originated or propagated by the router to the NSSA.
SEFOS# configure terminal
SEFOS(config)# ipv6 router ospf
SEFOS(config-router)# router-id 10.0.0.1
SEFOS(config-router)# area 0.0.0.6 nssa no-summary SEFOS(config-router)# end
SEFOS# show ipv6 ospf areas OSPFV3 AREA CONFIGURATION INFORMATION AreaId: 0.0.0.0 Area Type: NORMAL AREA Spf Calculation: 10 (times) Area Bdr Rtr Count: 0 As Bdr Rtr Count: 0 Area Summary: Send Summary AreaId: 0.0.0.6 Area Type: NSS AREA Spf Calculation: 14 (times) Area Bdr Rtr Count: 0 As Bdr Rtr Count: 0 Area Summary: No Summary Stub Metric: 0x1 Stub Metric Type: 2 Translator Role: Candidate Translator State: Elected/Enabled Nssa Stability Interval: 40