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Routing & Switching · Advanced

OSPF LSA Filtering

Techniques that block specific LSAs from entering an area, such as filter-list on an ABR or database-filter on an interface.

Definition

area X filter-list prefix filters Type 3 LSAs at the ABR. ip ospf database-filter all out stops flooding of all LSAs on an interface. Distribute-list in only affects the local RIB, not the LSDB. Junos uses import policies for externals and inter-area filtering at ABRs.

Example

area 2 filter-list prefix NO-LAB in

Exam tip

Within an area, link-state protocols cannot filter Type 1/2 LSAs; filtering only works at area or AS boundaries.

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