Ospfv3 stub router advertisement
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OSPFv3 Stub Router Advertisement. draft- shishio - ospf - ospfv3 -stub. Shishio Tsuchiya [email protected] Gunter Van de Velde [email protected] Tomohiro Yamagata [email protected] history. 00 - May 30, 2010 published

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OSPFv3 Stub Router Advertisement

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Ospfv3 stub router advertisement

OSPFv3 Stub Router Advertisement

draft-shishio-ospf-ospfv3-stub

Shishio Tsuchiya [email protected]

Gunter Van de [email protected]

Tomohiro Yamagata [email protected]


History

history

  • 00 - May 30, 2010 published

  • I have received a lot of feedbackcisco and KDDI internal.

  • 01 - Aug 28,2010 published

  • difference point of between 00 and 01

    • add author Gunter Van de Velde [email protected]

    • correction of “R-bit” clear behaviors


Problem statement

Problem statement

  • OSPFv3 has “no transit capability”,it is R-bit and v6-bit

  • OSPFv2 does not has “no transit capability” as the protocol,so most of venders supports RFC3137 as a technique.

  • OSPFv3 has same metric information field of all of LSAs(except of Link-LSA),so RFC3137 method can be adapted in OSPFv3.


Problem statement cont d

Problem statement cont’d

  • OSPFv3 should support both “R-bit,v6-bit” and “max-metric” as the protocol.

  • This draft described both methods to archive “OSPFv3 Stub Router advertisements”


Today s ospfv2 operation

today’s OSPFv2 operation

  • RFC3137is informational RFC,but most of venders already support,anda lot of customer are using now.

    • Wait for time/BGP[RFC3137]

    • LDP IGPSyncronization [RFC5447]

    • configuration change [RFC3137]


Ospf stub router advertisement

New Flow Of Traffic

Primary Flow of Traffic

OSPF Stub Router Advertisement

OSPF

Router can now be upgraded with minimal network interruption

router ospf 123

max-metric router-lsa


R bit v6 bit

“R-bit,v6-bit”

  • RFC5340 Errata describe how to process “R-bit,V6-bit”

    http://www.rfc-editor.org/errata_search.php?rfc=5340&eid=2078

  • If router supports “R-bit clear”,router should support wait for BGP or time same as RFC3137.


Ospfv2 compatibility mode max metric

OSPFv2 compatibility mode-max-metric-

  • OSPFv3 has metric information of all of LSAs(except of Link-LSA.)So,therouter can announce set to LSInfinity(0xFFFF).

+-+-+-+--+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| 0 |Nt|x|V|E|B| Options |

+-+-+-+--+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| Type | 0 | Metric |

+-+-+-+--+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| Interface ID |

+-+-+-+--+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


Summary

Summary

  • This draft does not require protocol enhancement

  • OSPFv3 should suport “R-bit clear” and “max-metric” as the protocol

  • The draft’s purpose is definition of both modes to avoid confusing for operators.


Next step

Next Step

  • accept it is WG item?

  • informational or standard?

    • RFC3137 is informational RFC but

      • RFC3137 was published in 2001,and some vendors has been supported for 8 or 9 years.

      • A lot of customers are using in their commercial network.

      • There is some RFCs are referingRFC3137. such as RFC5443,RFC5286.RFC4970,RFC4915,RFC3277

      • RFC3137 is stable and well-known.

        So I felt RFC3137 should be Standard.


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