Chapter 9: OSPFv3

Cisco Press

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Summary Table: Chapter 9 Command Review

CommandDescription
area area-id nssa [no-redistribution] [default-information-originate [metric] [metric-type]] [no-summary]Defines an area as a not so stubby area and gives the option of configuring related parameters.
area area-id range {ipv6-prefix /prefix-length} [advertise | not-advertise] [cost cost]Creates a summary prefix out of more specific routes in the specified area. The summary is flooded (or not flooded, depending on the advertise | not-advertise option) to the other areas.
area area-id stub [no-summary]Defines an area as a stub or totally stubby area.
debug ipv6 ospf packetProvides debugging information about each IPv6 OSPF packet received.
debug ipv6 ospf [adj | ipsec | database-timer | flood | hello | lsa-generation | retransmission]Provides debugging information about specific OSPF packet types.
ipv6 ospf process-id area area-id [instance instance-id]Creates the OSPFv3 process (if it is not already created) and enables OSPF on an interface.
ipv6 ospf neighbor ipv6-address [priority number] [poll-interval seconds] [cost number] [database-filter all out]Manually configures OSPFv3 neighbors.
ipv6 ospf network {broadcast | non-broadcast | {point-to-multipoint [non-broadcast] | point-to-point}}Configures the OSPF network type to a type other then the default for a given medium.
ipv6 ospf priority number-valueConfigures the OSPFv3 priority to give to a router for use in DR and BDR election.
ipv6 router ospf process-idEnables OSPFv3 router level configuration.
show ipv6 ospf [process-id] [area-id]Displays general information about the OSPFv3 process.
show ipv6 ospf [process-id] [area-id] neighbor [interface-type interface-number] [neighbor-id] [detail]Displays information about OSPFv3 neighbors.
show ipv6 ospf [process-id] [area-id] interface [interface-type interface-number]Displays OSPFv3 information related to the specified interface.
summary-prefix prefix [not-advertise | tag tag-value]Summarizes prefixes that are redistributed into OSPFv3.

Recommended Reading

Coltun R., D. Ferguson, and J. Moy, "OSPF for IPv6," RFC 2740, December 1999.

Review Questions

  1. Can OSPFv3 support IPv4?

  2. What is meant, in OSPFv3, that it can support multiple instances per link? What field in the OSPFv3 message header makes this possible?

  3. How are OSPFv3 packets authenticated?

  4. What is the OSPFv3 Next Header number?

  5. What are the two reserved OSPFv3 multicast addresses?

  6. Does OSPFv3 use any different message types than OSPFv2?

  7. What is the purpose of the first three bits of the Link State Type field of the OSPFv3 LSA header?

  8. What flooding scope is supported by OSPFv3 but not by OSPFv2? What LSA uses this flooding scope?

  9. What is the most significant difference between OSPFv2 Router and Network LSAs, and OSPFv3 Router and Network LSAs?

  10. What is the purpose of the Intra-Area Prefixes LSA?

  11. What is the purpose of the Link LSA?

Configuration Exercises

  1. Which OSPFv3 command is required to include a second IPv6 prefix that has been configured on an interface in the OSPFv3 process?

  2. Can two routers become adjacent if one is configured with the IPv6 address 2001:db8:0:1::1/64, and the other is configured with the address 2001:db8:0:100::1/126?

  3. Provide the IPv6 OSPFv3 configuration of the routers in Figure 9-19.

    Figure 9-19

    Figure 9-19

    IPv6 OSPFv3 network.

  4. Configure area 1 in Figure 9-19 as a totally stubby area and summarize addresses into area 0.


[1]The interface ID used in this and other OSPFv3 LSAs should not be confused with the 64-bit Interface ID portion of an IPv6 address. This field is a 32-bit value distinguishing this interface from other interfaces on the originating router. RFC 2740 suggests using the MIB-II If Index for the interface ID value.

[2]IPv4 uses Frame Relay inverse ARP to dynamically map addresses. IPv6's functionality to dynamically map addresses to Frame Relay PVCs is not supported in IOS at the time of this writing.

[3]Debugging IPv6 packets in a live network is not recommended.

Copyright © 2007 Pearson Education. All rights reserved.

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