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What Are the Common LSA Types of OSPF? Why Is Type 6 LSA Unavailable?

Latest reply: Mar 4, 2016 10:03:44 3526 1 1 0 1

Common link-state advertisement (LSA) types of OSPF are as follows:

  • Type 1 LSA: router LSA;
  • Type 2 LSA: network LSA;
  • Type 3 LSA: summary LSA;
  • Type 4 LSA: ASBR-summary LSA;
  • Type 5 LSA: AS-external-LSA;
  • Type 7 LSA: NSSA AS-external-LSA

The original OSPF packet coding is not Type Length Value (TLV)-based. For the extension of OSPF functions, only the LSA types of OSPF can be extended.

Type 6 LSAs are Group-Membership-LSAs used to identify multicast group membership in the Multicast Open Shortest Path First (MOSPF) protocol. Type 6 LSAs are not supported on the switch.

Type 8 LSAs are External-Attributes-LSAs used to redistribute Border Gateway Protocol (BGP) routes into OSPF and reserve the BGP autonomous system (AS) path information. Type 8 LSAs are not supported on the switch.

RFC 2370 defines an important LSA type, namely, Opaque LSA, which allows for TLV-like structures. OSPF applications, such as OSPF traffic engineering, are based on the Opaque LSA extension abilities:

  • Type 9 LSAs are Opaque LSAs that are advertised within the local link only;
  • Type 10 LSAs are Opaque LSAs that are advertised within the local area only;
  • Type 11 LSAs, similar to Type 5 LSAs, are Opaque LSAs that are advertised within the local AS.

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  • convention:

Created Mar 4, 2016 10:03:44

Thank you.
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