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CCNP Core > Chap 10 - OSPFv3 > Flashcards

Chap 10 - OSPFv3 Flashcards

1
Q

What are 9 ways that OSPFv3 is different from OSPFv2?

A
  • Multiple Address Families
  • New LSA types
  • Removal of Address Semantics from OSPF packet headers
  • LSA Flooding scope is identified
  • Packet format - number of fields has been reduced
  • Router ID - must be manually assigned
  • Authentication - removed from OSPFv3
  • Neighbor adjacencies - handled by link-local addressing
  • Multiple Instances - OSPFv3 packets carry Instance ID
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2
Q

What are the 8 LSA Types in OSPFv3?

A
  • 0x2001 Router
  • 0x2002 Network
  • 0x2003 InterArea Prefix
  • 0x2004 InterArea Router
  • 0x4005 AS External
  • 0x2007 NSSA
  • 0x0008 Link
  • 0x2009 IntraArea Prefix
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3
Q

In the LSA types what is the difference between 0x2 , 0x0 , and 0x4 ?

A
  • 0x0 - LSA scope limited to the link itself
  • 0x2 - LSA stays within the area
  • 0x4 - LSA is flooded throughout the entire AS
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4
Q

What address does the DR and BDR use to communicate with the DROthers?

A

FF02::05

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5
Q

What address does the DROthers use to communicate with the DR and BDR?

A

FF02::06

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6
Q

What are the 5 packet types used by OSPFv3?

A
  • Hello
  • DD
  • LSR
  • LSU
  • Link-state Ack
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7
Q

In terms of Router ID what happens if there are no IPv4 interface addresses configured on the router?

A

OSPFv3 sets the router ID to 0.0.0.0 and no adjacencies will be allowed to be formed.

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8
Q

What is different about the ‘router’ command in OSPFv3?

A

It is now ‘router ospfv3 (process_id)

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9
Q

What is different about the ‘show interface’ command?

A
  • It is now ‘show ospfv3 interface gig0/1’
  • It no longer shows an IP address, just an Interface ID
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10
Q

What is new in OSPFv3 about address families?

A

OSPFv3 now supports both IPv4 and IPv6

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11
Q

What is different about IP addresses in OSPFv3?

A

IP addresses are no longer in the OSPFv3 packet headers. Instead its part of the payload in the LSAs.

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12
Q

What is the term for network in OSPFv3?

A

Link because the SPF calculations are per link instead of per subnet.

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13
Q

What is new in OSPFv3 about LSA Flooding?

A

OSPFv3 includes a Link-state Type field used to determine the flooding scope as well as handling of unknown LSA types.

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14
Q

Can 2 routers be OSPF neighbors even if they don’t share a common subnet?

A

Yes

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15
Q

What protocol ID does OSPFv3 use?

A

89

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16
Q

True or False - In OSPFv3 a routing process does not need to be specifically created.

A

True. Enabling OSPFv3 on an interface will create the associated routing process.

17
Q

When do you need to manually configure neighbors?

A

On NBMA networks.

18
Q

What does a Type 0x2001 Router LSA do?

A
  • Describes link state and costs of a router’s links to the area.
  • Flooded within the area only.
  • Indicates if router is a ABR or ASBR
  • Contains no address information
  • Network protocol independent
19
Q

What does a Type 0x2002 Network LSA do?

A
  • Describes link state and cost info for all routers attached to the network
  • Aggregates all the link state and cost information in the network
  • Generated only by the DR
  • Contains no address info
  • Network protocol independent
20
Q

What does a Type 0x2003 InterArea Prefix LSA do?

A
  • Advertises internal networks to routers in other areas (InterArea Routes)
  • May represent a single network or a summary
  • Only ABRs generate these
  • Addresses expressed as prefix and prefix length
  • Default route expressed as prefix with prefix length of 0
21
Q

What does a Type 0x2004 InterArea Router LSA do?

A
  • Advertises the location of ASBRs
  • Generated by ABRs on behalf of ASBRs
  • Routers trying to reach an external network use these.
22
Q

What does a Type 0x4005 Autonomous System External LSA do?

A
  • Redistributes routes from another Autonomous System, usually from a different routing protocol into OSPFv3
  • Addresses represented as Prefix, Prefix Length
23
Q

What does a Type 0x2007 NSSA LSA do?

A
  • Advertises routes redistributed into the area
  • Generated by ASBRs in NSSA networks
24
Q

What does a Type 0x0008 Link LSA do?

A
  • Maps all global unicast prefixes associated with the interface to the Link Local Address of the interface
  • Advertised only to a neighbor on the same link
  • Advertised to the neighbors Link Local address
25
Q

What does a Type 0x2009 IntraArea Prefix LSA do?

A

Advertises one or more prefixes that are associated with a router, stub, or transit network segment

26
Q

Verify the OSPFv3 neighbors.

A

show ospfv3 ipv6 neighbor

27
Q

Verify the OSPFv3 interface gig0/1.

A

show ospfv3 interface gig0/1

28
Q

Display the OSPFv3 routes.

A

show ipv6 route ospfv3

29
Q

Check to see if an interface is Passive

A

show ospfv3 interface gig0/1 | I Passive

30
Q

Display the network type of an interface.

A

show ospfv3 interface gig0/1

31
Q

Display the address-family on interfaces

A

show ospfv3 interface brief

32
Q

Display the IPv4 OSPF neighbors

A

show ospfv3 neighbor

CCNP Core (46 decks)

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