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Webcast-Catalyst9k
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OSPF Multi-Area

As per all docs, multi-area OSPF reduces Link state database on a Internal Router.

But if I don't configure summarization, Stub, Totally stub kind of features, then on a vanilla multi-area OSPF topology below will happen

"Internal router will have less Type 1 LSA but will now have the addition of multiple Type 3 LSA of other areas. So overall we have not reduced the database size."

Am I right in above statement?... This means without any stub or summarization config on internal Router, I am not reducing the DB size even after having multi-area OSPF

1 REPLY
Cisco Employee

Re: OSPF Multi-Area

Rohit,

That would be a correct statement. The advantage though would be that a link flapping in one area would trigger a full SPF run only in that specific area.

Regards

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
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