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Routing & Switching · Intermediate

OSPF Totally Stubby Area

A Cisco OSPF area type that blocks Type 3, 4 and 5 LSAs, leaving only a default route from the ABR.

Definition

Configured with area X stub no-summary on the ABR (others need only area X stub). Routers inside see only intra-area routes plus a single O*IA default. It provides the smallest LSDB for single-exit areas. Junos achieves the same with stub no-summaries.

Example

area 2 stub no-summary on the ABR

Exam tip

no-summary is only needed on the ABR; it is a Cisco proprietary extension.

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