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You are here: Home / ROUTE / Module 3 / OSPF – OSPF Areas Part II

OSPF – OSPF Areas Part II

Totally Not-so-stubby Areas (TNSSAs)

Totally Not-so-stubby Areas (TNSSAs) are an extension of NSSAs. Like NSSAs, Type 5 LSAs are not allowed into a TNSSA. However, unlike NSSAs, Summary LSAs are not allowed into a TNSSA. In addition to this, when a TNSSA is configured, the default route is injected into the area as a Type 7 LSA.  TNSSAs have the following characteristics:

  • Type 7 LSAs are converted into Type 5 LSAs at the NSSA ABR
  • They do not allow Network Summary LSAs
  • They do not allow External LSAs . . .

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