Types of LSAs used in OSPF

1,545 pts.
Tags:
Internet protocol
Link-state advertisements (LSAs)
Networking
OSPF protocol
Routing protocols
What are the different types of link-state advertisements (LSAs) that will be used in Open Shortest Path First (OSPF)?
ASKED: March 12, 2008  6:44 PM
UPDATED: May 6, 2011  2:36 AM

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Following are the types of LSAs you would usually find in an OSPF network:

Type 1: router LSA — A router sends this to describe neighbors and its own interfaces.

Type 2: network LSA — For broadcast networks only; this LSA is flooded by the DR and lists OSPF-speaking routers on the network.

Type 3: network summary LSA — Sent by an ABR to advertise networks reachable through it. A stub area router will also use this for the default route.

Type 4: ASBR-summary LSA — Sent by ABR, but only internally. This describes to the others how to get to the ASBR itself, and uses only internal metrics.

Type 5: AS-external LSA — Used to describe external routes to internal areas. Can be used to advertise “this is the way to the Internet” (or some subset of).

Type 6: Group summary — Used in multicast (MOSPF). Ignore this.Cisco Routers does not support LSA6.

Type 7: NSSA area import.

Type 8: External Attributes LSA –- This is very rarely deployed and is used when BGP information is carried across OSPF AS.

Type 9, 10, 11 are Opaque LSAs — They are designated for future specifically for application specific purposes.

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  • Shivlu
    LSA 1- http://www.mplsvpn.info/2009/09/ospf-link-state-advertisement-lsa-1.html LSA 2- http://www.mplsvpn.info/2009/09/ospf-link-state-advertisement-lsa-2.html LSA 3- http://www.mplsvpn.info/2009/09/ospf-link-state-advertisement-lsa-3.html LSA 4- http://www.mplsvpn.info/2009/09/ospf-link-state-advertisement-lsa-4.html LSA 5- http://www.mplsvpn.info/2009/09/external-lsa-5.html regards shivlu jain www.mplsvpn.info
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  • Michael Tidmarsh
    Are you looking to find out what the SearchNetworking team has been up to lately? Check out 'The Network Hub' for commentary on the latest networking news, networking management and administration.
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