Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
19 Cards in this Set
- Front
- Back
|
OSPF Standard Area
|
Default OSPF area type
|
|
|
Stub area (OSPF)
|
External Summary route, LSAs are replaced by the ABR with a default route.
|
|
|
Totally Stubby Area (OSPF)
|
A stub area which also replaces summary LSAs with a default route
|
|
|
Not So Stubby Area (NSSA) (OSPF)
|
A stubby area containing an ASBR; type 5 LSAs are converted to type 7 within the area
|
|
|
LSA Type 1 (OSPF)
|
Router Link · Lists a router's neighbors and its cost to each;
flooded throughout an area |
|
|
LSA Type 2 (OSPF)
|
Type 2 Network Link · Generated by a DR; lists all routers on an adjacent
segment; flooded throughout an area |
|
|
LSA Type 3 (OSPF)
|
Network Summary · Generated by an ABR and sent between
areas; point of summarization |
|
|
LSA Type 4 (OSPF)
|
ASBR Summary · Injected by an ABR into the backbone to
advertise the presence of an ASBR |
|
|
LSA Type 5 (OSPF)
|
External Link · Generated by an ASBR and flooded throughout the
AS to advertise a route external to OSPF |
|
|
LSA Type 7 (OSPF)
|
NSSA External Link · Generated by an ASBR in a not-so-stubby
area; converted into a type 5 LSA by the ABR |
|
|
OSPF Metric Formula
|
Cost = 100,000,000 bps / Link Speed (default)
|
|
|
Internal Router (OSPF)
|
Internal Router · All interfaces reside
within the same area |
|
|
Backbone Router (OSPF)
|
Backbone Router · A router with an
interface in area 0 (the backbone) |
|
|
Area Border Router (ABR) (OSPF)
|
Area Border Router (ABR) · Connects
two or more areas |
|
|
AS Boundary Router (ASBR) (OSPF)
|
AS Boundary Router (ASBR) · Connects
to additional routing domains; typically located in the backbone |
|
|
DR (OSPF)
|
The Designated Router servers as a common point for all adjacencies on a multiaccess segment.
|
|
|
BDR (OSPF)
|
The Backup Designated Router servers as a common backup point for all adjacencies on a multiaccess segment.
|
|
|
Virtual Link (OSPF)
|
Tunnel formed to join two
areas across an intermediate Both end routers must share a common area At least one end must reside in area 0 Cannot traverse stub areas Temporary solution; not considered best practice |
|
|
Router ID (OSPF)
|
Uniquely Identifies the Router
-by default uses the numerically highest IP address, loopback first, if no loopback then hardware. In order for OSPF to start on a cisco ios an interface must be up with an ip address. A loopback interface is considered best practice because they are always up. It can also be statically set however only after the ospf process starts. |
