OSPFv3

Question 1

What is OSPFv3

Answer 1

It is the latest version of OSPF routing protocol it is designed to support Ipv6 networks as well as IPv4.

Question 2

What are the main differences between OSPFv3 and OSPFv2

Answer 2

Support for both IPv6 and IPv4
New LSAs to carry IPv6 traffic
Packet format - fields reduced
Router ID - Always manually assigned in OSPFv3
Authentication has been removed from the packet header
Neighbour adjacencies
Instance ID

Question 3

How are neighbour adjacencies different in OSPFv3

Answer 3

It is handled at the interface by IPv6 link local addresses

in NBMA neighbours are not automatically detected and must be specified by link local address

OSPFv3 can form neighbours when using Ipv6 on different subnets.

Question 4

What are the new LSAs in OSPFv3

Answer 4

Intra-area prefix LSA

Link local LSA

Question 5

What is a Intra-area prefix LSA

Answer 5

Used to advertise one or more IPv6 prefixes that are associated with a router, within the same area.

Question 6

What is a Link local LSA

Answer 6

Used to advertise the next hop on that link.

Question 7

What is the fundamental difference between OSPFV2 and OSPFv3 in how it builds its LSDB

Answer 7

OSPFv3 uses links and OSPFv2 uses networks to build its LSDB.

Question 8

What are the OSPFv3 multicast addresses for communication

Answer 8

All OSPFv3 routers - FF02::05

All OSPFv3 DR routers - FF02::06

Question 9

What are the pre-requisites for a new router to configure OSPFv3

Answer 9

enable IPv6 unicast routing

assign a router ID

Question 10

Passive interfaces are supported in OSPFv3 (T/F)

Answer 10

True

Question 11

What is the command to view OSPFv3 IPv6 neighbours

Answer 11

Show OSPFv3 Ipv6 neighbours

Question 12

Summarisation is not supported in OSPFv3 (T/F)

Answer 12

False - it is supported

Question 13

What must be done to allow IPv4 to function on OSPFv3

Answer 13

ensure IPv4 interface has a IPv6 (global or link local) address configured.