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Routing & Switching · Intermediate

OSPF Area Range

Inter-area summarization configured on an ABR to advertise one Type 3 LSA for a block of intra-area routes.

Definition

area <id> range summarizes prefixes from the specified area into others. The summary's cost is derived from the component routes unless set with the cost keyword, and a discard route to Null0 is installed. The not-advertise keyword can suppress prefixes entirely.

Example

area 1 range 10.1.0.0 255.255.0.0

Exam tip

Use area range on ABRs; summary-address is for externals on ASBRs.

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