OSPF Routing Configuration Flashcards
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Read the first 7 OSPF Routing Configuration flashcards as text
On an Aruba AOS-CX switch, which OSPF LSA type is generated by an ASBR to advertise external routes into the OSPF domain?
Answer: Type 5 AS External LSA
Type 5 AS External LSAs are originated by ASBRs to flood external routing information throughout the OSPF domain (except stub areas).
An Aruba switch in an NSSA area originates a Type 7 LSA for a redistributed external route. What converts it to a Type 5 LSA at the area border?
Answer: The ABR connecting the NSSA to the backbone
The ABR at the NSSA boundary translates Type 7 LSAs to Type 5 LSAs so the external route information can propagate throughout the OSPF domain.
What is the default OSPF hello interval on Aruba switch Ethernet interfaces?
Answer: 10 seconds
Ethernet (broadcast) interfaces use a 10-second hello interval by default, with a dead interval of 40 seconds.
An Aruba switch receives an OSPF DBD packet during neighbor exchange. What does the MS bit in the DBD indicate?
Answer: The sending router is the master in the master/slave relationship
The MS (Master/Slave) bit in the DBD packet indicates which router is the master, controlling the DBD sequence number exchange during OSPF database synchronization.
Which OSPF neighbor state indicates that the two Aruba switches have fully synchronized their link-state databases?
Answer: FULL
The FULL state means both routers have identical LSDBs and the adjacency is complete; this is the desired end state for OSPF neighbors.
When redistributing static routes into OSPF on an Aruba AOS-CX switch, which command is used and what default metric type is applied?
Answer: redistribute static, Type 2 (E2) by default
The 'redistribute static' command under router ospf injects static routes as OSPF external routes with Type 2 (E2) metric by default.
On an Aruba switch, what is the purpose of OSPF route summarization configured on an ABR?
Answer: To reduce the number of Type 3 LSAs sent from the ABR into other areas
ABR summarization aggregates multiple specific Type 3 inter-area LSAs into a single summary LSA, reducing LSDB size and SPF computation in other areas.