6. OSPF STUB Flashcards
Which LSA types are not allowed in an OSPF stub area as defined by RFC 2328?
4,5 & 7
What is the command every interface in the stub area needs to have?
area x stub
Which TWO (2) stub area types are considered to be Cisco proprietary?
Totally Stub and Totally Not-so-Stubby
How many virtual links are supported by OSPF stub area types?
None
Which “bit” is known as the “stub flag”?
The E bit
What is the totally stub area?
Cisco proprietary
Which LSA types are not allowed in an OSPF totally stub area?
1 & 2
Which command, when used on the ABR, is used to configure the Totally Stubby Area?
area x stub no-summary
What is the value of the ‘E bit’ when a Totally Stubby Area has been configured?
0
How many ASBRs are supported in a Totally Stubby Area?
0
Which router is responsible for the injection of the default route into a Totally Stubby Area?
ABR
Which LSA types are NOT found in OSPF Totally Not-so-Stubby Areas (NSSA)?
Type 3, Type 4, and Type 5
Which OSPF configuration command is used to define an NSSA?
area x nssa no-summary
Which OSPF bit is seen in HELLO packets for NSSA-capable routers?
N bit
Which router is responsible for the filtering out of LSAs in an NSSA?
The ABR
Where must internal summarization take place?
The ABR
What area is used with internal summarization?
The area where it is coming from
Where must external summarization take place?
ABR or ASBR
The ‘null0’ route is also known by what other name?
The discard route
Which ONE (1) statement below is TRUE for the E1 metric type?
The E1 metric value will never change once set
Which ONE (1) statement below is TRUE for the E1 metric type?
The E1 metric value will never change once set VERKEERD!!
Which command can be used to remove the ‘null0’ route?
no discard-route
What is the default metric type for external routes that have been summarized in OSPF?
O E2
Which ONE (1) statement below is TRUE for the E2 metric type?
The E2 metric value cannot be manually changed
