| Junos Router | OSPF router types | | Print | |
OSPF describes various router roles that govern their operation and impact the types of areas in which they are permitted. To become proficient with OSPF operation and network design, you must have a clear understanding of the differences between OSPF area types and between the LSAs permitted within each area:
Internal router
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Any router that has all its interfaces contained within a single area is an internal router. If attached to the backbone area, the router is also known as a backbone router.
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Any router with an attachment to area 0 (the backbone area) is considered a backbone router. This router may also be an internal or area border router depending on whether it has links to other, nonbackbone areas.
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A router with links in two or more areas is an ABR. The ABR is responsible for connecting OSPF areas to the backbone by conveying network summary information between the backbone and nonbackbone areas.
Antonymous system boundary router (ASBR)
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A router that injects external routing information into an OSPF domain is an ASBR.
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