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tech:network:cisco:ospf:nssa:nssa

Cisco: OSPF NSSA, Totally NSSA

Lab 1: 0faa4d30-6657-4980-aada-20b4c76c7cb9

Topology

Base Configuration

Common Configuration Snippet

R1

R2

R3

R4

R5

R6

Standard Area Verification w/o route redistribution 19420958-16ee-4658-9264-ae86d4f23d16

Standard Area Configuration w/ route redistribution a85cbf6f-5133-4dab-b4c2-84cf6c4585ba

  • R2
configure terminal
!
router ospf 1
 ! redistribute from eigrp to ospf
 redistribute eigrp 1
exit
!
end
  • R5
configure terminal
!
router ospf 1
 ! redistribute from eigrp to ospf
 redistribute rip
exit
!
end

Standard Area Verification w/ route redistribution

  • show routing table for OSPF
show ip route ospf
  • show OSPF process summary
show ip protocols | section ospf
  • show LSA Database Sumary
show ip ospf database
  • Wireshark Display Filter Expression
ospf && !ospf.hello
ospf && ospf.lsa.summary
ospf && ospf.lsa.asbr
ospf && ospf.lsa.asext

R1

R2

R3

R4

R5

R6

NSSA Configuration w/ route redistribution w/o defaul-route a22ccbc8-07f7-42e9-85de-fca892a6773c

  • R3, R4, R5
configure terminal
!
router ospf 1
 area 10 nssa
exit
!
end
  • R2
configure terminal
!
router ospf 1
 ! redistribute from eigrp to ospf
 redistribute eigrp 1
exit
!
end
  • R5
configure terminal
!
router ospf 1
 ! redistribute from eigrp to ospf
 redistribute rip
exit
!
end

NSSA Verification w/ route redistribution w/o defaul-route

  • show OSPF process summary
show ip protocols | section ospf
  • show LSA Database Sumary
show ip ospf database
  • Wireshark Display Filter Expression
ospf && !ospf.hello
ospf && ospf.lsa.summary
ospf && ospf.lsa.asbr
ospf && ospf.lsa.asext
ospf && ospf.lsa.nssa
ospf.lsa in {5 7}

R1

R2

R3

R4

R5

R6

NSSA Configuration w/ defaul-route db43d294-daf2-4e2a-9c0f-185d51109f43

  • R3
configure terminal
!
router ospf 1
 area 10 nssa default-information-originate
exit
!
end
  • R4, R5
configure terminal
!
router ospf 1
 area 10 nssa
exit
!
end
  • R2
configure terminal
!
router ospf 1
 ! redistribute from eigrp to ospf
 redistribute eigrp 1
exit
!
end
  • R5
configure terminal
!
router ospf 1
 ! redistribute from eigrp to ospf
 redistribute rip
exit
!
end

NSSA Verification w/ defaul-route

  • show OSPF process summary
show ip protocols | section ospf
  • show LSA Database Sumary
show ip ospf database
  • Wireshark Display Filter Expression
ospf && !ospf.hello
ospf && ospf.lsa.summary
ospf && ospf.lsa.asbr
ospf && ospf.lsa.asext
ospf && ospf.lsa.nssa
ospf.lsa in {5 7}

R1

R2

R3

R4

R5

R6

Totally NSSA Configuration f8b5f0cc-ae42-4947-ae96-fde1f94fc5f7

  • R3 (ABR only)
configure terminal
!
router ospf 1
 ! default-information-originate is not required in NSSA.
 area 10 nssa no-summary
exit
!
end
  • R4, R5 (All NSSA Router Configuraion Needed)
configure terminal
!
router ospf 1
 area 10 nssa
exit
!
end
  • R2
configure terminal
!
router ospf 1
 ! redistribute from eigrp to ospf
 redistribute eigrp 1
exit
!
end
  • R5
configure terminal
!
router ospf 1
 ! redistribute from eigrp to ospf
 redistribute rip
exit
!
end

Totally NSSA Verification

The growth of the Internet has increased the importance of scalability in IGPs such as OSPF. By design, OSPF requires LSAs to be refreshed as they expire after 3600 seconds.
  • show routing table for OSPF
show ip route ospf
  • show OSPF process summary
show ip protocols | section ospf
  • show LSA Database Sumary
show ip ospf database
  • Wireshark Display Filter Expression
ospf && !ospf.hello
ospf && ospf.lsa.summary
ospf && ospf.lsa.asbr
ospf && ospf.lsa.asext
ospf.lsa in {3 5}
ospf.lsa in {3 5 7}

R1

R2

R3

R4

R5

R6

R3 Ge0/2 Wireshark Capture Log

R4 Ge0/2 Wireshark Capture Log

References

tech/network/cisco/ospf/nssa/nssa.txt · Last modified: 2020/01/13 16:47 by wnoguchi