OSPF Flashcards

1
Q

LSA

A

Link State Advertisement - contains info about network topology. Sent to all neighbors in database exchanges

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2
Q

passive interface

A

an interface that does not participate in the protocol

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3
Q

HELLO

A

Messages that contain RID, network and timing info. sent to multicast 224.0.0.5

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4
Q

DR

A

Designated router that ensures other routers in the same subnet remain updated. The router with the highest RID is the DR.

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5
Q

RID

A

Router ID. A 32-bit identifier. Either the highest loopback address or highest IP address of the interfaces

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6
Q

Basic OSPF configuration

A

router ospf

network area

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7
Q

Neighbors

A

A relationship between two routers that share the same link

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8
Q

OSPF metric

A

sum of the interface costs for all outgoing interfaces in the route

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9
Q

Key troubleshooting commands

A

show ip protocols
show run
show ip route

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10
Q

OSPF neighbor requirements

A

areas must match
hello/dead timers must match
interfaces must be up/up
MTU mismatch may cause problems

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11
Q

View neighbors

A

show ip ospf neighbor

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12
Q

hello timer

A

The interval a router expects to receive a Hello

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13
Q

dead timer

A

The max interval a router will wait to receive a Hello (4x times as long as the hello timer)

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