Understanding OSPF LSA types is really important for CCNP Route exam and OSPF implementation in general.
LSA Type 1 - Called Router LSAs that a router will generate for every area that is belongs to. It contains routing information such as routers interfaces in the same area, stub networks, its adjacent routers, and relevant interfaces IPs.
LSA Type 2 - Called Network LSAs that are generated by the DR on a multi-access segment. It contains routing information such as LSA Type 1.
LSA Type 3 - Called Network Summary LSAs that are generated by the Area Border Routers. It contains the subnets and costs.
LSA Type 4 - Called ASBR Summary LSAs that are generated by the ASBRs. It contains the subnets and costs (identical with LSA Type 3) and sent when crossing an AS boundary.
LSA Type 5 - Autonomous System External LSAs that are generated by the ASBRs. It contains routing information of external networks.
LSA Type 6 - Called Group Membership LSAs but not supported by Cisco devices.
LSA Type 7 - Called NSSA External LSAs that are generated by the ASBR in an NSSA area. LSA Type 7 will be use to carry the external prefix information into the non so stubby area.
LSA Type 8 - Called External Attribute LSA but not supported by Cisco devices.
LSA Types 9 to 11 - Called Opaque LSAs but not supported by any network devices - reserved for future expansion.
LSA Type 1 - Called Router LSAs that a router will generate for every area that is belongs to. It contains routing information such as routers interfaces in the same area, stub networks, its adjacent routers, and relevant interfaces IPs.
LSA Type 2 - Called Network LSAs that are generated by the DR on a multi-access segment. It contains routing information such as LSA Type 1.
LSA Type 3 - Called Network Summary LSAs that are generated by the Area Border Routers. It contains the subnets and costs.
LSA Type 4 - Called ASBR Summary LSAs that are generated by the ASBRs. It contains the subnets and costs (identical with LSA Type 3) and sent when crossing an AS boundary.
LSA Type 5 - Autonomous System External LSAs that are generated by the ASBRs. It contains routing information of external networks.
LSA Type 6 - Called Group Membership LSAs but not supported by Cisco devices.
LSA Type 7 - Called NSSA External LSAs that are generated by the ASBR in an NSSA area. LSA Type 7 will be use to carry the external prefix information into the non so stubby area.
LSA Type 8 - Called External Attribute LSA but not supported by Cisco devices.
LSA Types 9 to 11 - Called Opaque LSAs but not supported by any network devices - reserved for future expansion.
No comments:
Post a Comment