Chap 10 - OSPFv3 Flashcards
What are 9 ways that OSPFv3 is different from OSPFv2?
- 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
What are the 8 LSA Types in OSPFv3?
- 0x2001 Router
- 0x2002 Network
- 0x2003 InterArea Prefix
- 0x2004 InterArea Router
- 0x4005 AS External
- 0x2007 NSSA
- 0x0008 Link
- 0x2009 IntraArea Prefix
In the LSA types what is the difference between 0x2 , 0x0 , and 0x4 ?
- 0x0 - LSA scope limited to the link itself
- 0x2 - LSA stays within the area
- 0x4 - LSA is flooded throughout the entire AS
What address does the DR and BDR use to communicate with the DROthers?
FF02::05
What address does the DROthers use to communicate with the DR and BDR?
FF02::06
What are the 5 packet types used by OSPFv3?
- Hello
- DD
- LSR
- LSU
- Link-state Ack
In terms of Router ID what happens if there are no IPv4 interface addresses configured on the router?
OSPFv3 sets the router ID to 0.0.0.0 and no adjacencies will be allowed to be formed.
What is different about the ‘router’ command in OSPFv3?
It is now ‘router ospfv3 (process_id)
What is different about the ‘show interface’ command?
- It is now ‘show ospfv3 interface gig0/1’
- It no longer shows an IP address, just an Interface ID
What is new in OSPFv3 about address families?
OSPFv3 now supports both IPv4 and IPv6
What is different about IP addresses in OSPFv3?
IP addresses are no longer in the OSPFv3 packet headers. Instead its part of the payload in the LSAs.
What is the term for network in OSPFv3?
Link because the SPF calculations are per link instead of per subnet.
What is new in OSPFv3 about LSA Flooding?
OSPFv3 includes a Link-state Type field used to determine the flooding scope as well as handling of unknown LSA types.
Can 2 routers be OSPF neighbors even if they don’t share a common subnet?
Yes
What protocol ID does OSPFv3 use?
89