R1#show ipv6 route ospf | be 110
O 2001:A:A:30::/64 [110/74]
via FE80::5054:FF:FE11:C0FE, GigabitEthernet2
via FE80::5054:FF:FE08:E390, GigabitEthernet1
R2#show ipv6 route ospf | be 110
O 2001:A:A:20::/64 [110/74]
via FE80::5054:FF:FE16:D3E5, GigabitEthernet1
R3#show ipv6 route ospf | be 110
O 2001:A:A:10::/64 [110/74]
via FE80::5054:FF:FE0E:A92, GigabitEthernet1
The next hop for each route is the link-local address of the next-hop router, gleaned from the Type 8 LSA.
LSDB Summary
R1#show ipv6 ospf data
OSPFv3 Router with ID (1.1.1.1) (Process ID 1)
Router Link States (Area 0)
ADV Router Age Seq# Fragment ID Link count Bits
1.1.1.1 518 0x80000004 0 2 None
2.2.2.2 435 0x80000006 0 2 None
3.3.3.3 442 0x80000007 0 2 None
Net Link States (Area 0)
ADV Router Age Seq# Link ID Rtr count
3.3.3.3 457 0x80000001 7 2
Link (Type-8) Link States (Area 0)
ADV Router Age Seq# Link ID Interface
1.1.1.1 545 0x80000001 7 Gi1
2.2.2.2 519 0x80000001 8 Gi1
1.1.1.1 563 0x80000001 8 Gi2
3.3.3.3 616 0x80000001 8 Gi2
Intra Area Prefix Link States (Area 0)
ADV Router Age Seq# Link ID Ref-lstype Ref-LSID
1.1.1.1 545 0x80000002 0 0x2001 0
2.2.2.2 457 0x80000003 0 0x2001 0
3.3.3.3 457 0x80000003 0 0x2001 0
3.3.3.3 457 0x80000001 7168 0x2002 7
Router LSAs (Type 1)
R1#show ipv6 ospf database router adv-router 1.1.1.1
OSPFv3 Router with ID (1.1.1.1) (Process ID 1)
Router Link States (Area 0)
LS age: 449
Options: (V6-Bit, E-Bit, R-Bit, DC-Bit)
LS Type: Router Links
Link State ID: 0
Advertising Router: 1.1.1.1
LS Seq Number: 80000004
Checksum: 0x83B1
Length: 56
Number of Links: 2
Link connected to: another Router (point-to-point)
Link Metric: 64
Local Interface ID: 7
Neighbor Interface ID: 8
Neighbor Router ID: 2.2.2.2
Link connected to: another Router (point-to-point)
Link Metric: 64
Local Interface ID: 8
Neighbor Interface ID: 8
Neighbor Router ID: 3.3.3.3
R1#show ipv6 ospf database router adv-router 2.2.2.2
OSPFv3 Router with ID (1.1.1.1) (Process ID 1)
Router Link States (Area 0)
LS age: 371
Options: (V6-Bit, E-Bit, R-Bit, DC-Bit)
LS Type: Router Links
Link State ID: 0
Advertising Router: 2.2.2.2
LS Seq Number: 80000006
Checksum: 0x4327
Length: 56
Number of Links: 2
Link connected to: a Transit Network
Link Metric: 10
Local Interface ID: 7
Neighbor (DR) Interface ID: 7
Neighbor (DR) Router ID: 3.3.3.3
Link connected to: another Router (point-to-point)
Link Metric: 64
Local Interface ID: 8
Neighbor Interface ID: 7
Neighbor Router ID: 1.1.1.1
R1#show ipv6 ospf database router adv-router 3.3.3.3
OSPFv3 Router with ID (1.1.1.1) (Process ID 1)
Router Link States (Area 0)
LS age: 381
Options: (V6-Bit, E-Bit, R-Bit, DC-Bit)
LS Type: Router Links
Link State ID: 0
Advertising Router: 3.3.3.3
LS Seq Number: 80000007
Checksum: 0x451F
Length: 56
Number of Links: 2
Link connected to: a Transit Network
Link Metric: 10
Local Interface ID: 7
Neighbor (DR) Interface ID: 7
Neighbor (DR) Router ID: 3.3.3.3
Link connected to: another Router (point-to-point)
Link Metric: 64
Local Interface ID: 8
Neighbor Interface ID: 8
Neighbor Router ID: 1.1.1.1
There is no IPv6 addressing information contained in OSPFv3 Type 1 LSAs. These LSAs are only used to build the topology. The topology includes which routers exist in the area and how they interconnect. A transit network is a broadcast domain. Notice that each interface has an ID instead of an IP address. A p2p link simply lists the router on the other end, and the local and remote interface IDs
Another difference compared to OSPFv2 is that the link state ID is 0. In OSPFv2 the link state ID is the RID that originates the LSA. However, in OSPFv2 it is redundant information, as the RID is listed twice, in the advertising router ID field and the link state ID field. In OSPFv3, there is no need to populate the link state ID so it is just set to 0.
Network LSAs (Type 2)
R1#show ipv6 ospf database network
OSPFv3 Router with ID (1.1.1.1) (Process ID 1)
Net Link States (Area 0)
LS age: 441
Options: (V6-Bit, E-Bit, R-Bit, DC-Bit)
LS Type: Network Links
Link State ID: 7 (Interface ID of Designated Router)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0x1BC6
Length: 32
Attached Router: 3.3.3.3
Attached Router: 2.2.2.2
The OSPFv3 Type 2 LSA also does not list any addressing information. It is simply used to build the topology, and includes information about broadcast domains. The DR advertises this LSA, just as in OSPFv2. The LSA simply lists the attached routers.
Link LSAs (Type 8) - R1's Perspective
R1#show ipv6 ospf data link adv-router 1.1.1.1
OSPFv3 Router with ID (1.1.1.1) (Process ID 1)
Link (Type-8) Link States (Area 0)
LS age: 579
Options: (V6-Bit, E-Bit, R-Bit, DC-Bit)
LS Type: Link-LSA (Interface: GigabitEthernet1)
Link State ID: 7 (Interface ID)
Advertising Router: 1.1.1.1
LS Seq Number: 80000001
Checksum: 0x128F
Length: 56
Router Priority: 1
Link Local Address: FE80::5054:FF:FE12:722F
Number of Prefixes: 1
Prefix Address: 2001:A:A:10::
Prefix Length: 64, Options: None
LS age: 596
Options: (V6-Bit, E-Bit, R-Bit, DC-Bit)
LS Type: Link-LSA (Interface: GigabitEthernet2)
Link State ID: 8 (Interface ID)
Advertising Router: 1.1.1.1
LS Seq Number: 80000001
Checksum: 0x59CE
Length: 56
Router Priority: 1
Link Local Address: FE80::5054:FF:FE1A:6C95
Number of Prefixes: 1
Prefix Address: 2001:A:A:20::
Prefix Length: 64, Options: None
R1#show ipv6 ospf data link adv-router 2.2.2.2
OSPFv3 Router with ID (1.1.1.1) (Process ID 1)
Link (Type-8) Link States (Area 0)
LS age: 556
Options: (V6-Bit, E-Bit, R-Bit, DC-Bit)
LS Type: Link-LSA (Interface: GigabitEthernet1)
Link State ID: 8 (Interface ID)
Advertising Router: 2.2.2.2
LS Seq Number: 80000001
Checksum: 0xCD06
Length: 56
Router Priority: 1
Link Local Address: FE80::5054:FF:FE08:E390
Number of Prefixes: 1
Prefix Address: 2001:A:A:10::
Prefix Length: 64, Options: None
R1#show ipv6 ospf data link adv-router 3.3.3.3
OSPFv3 Router with ID (1.1.1.1) (Process ID 1)
Link (Type-8) Link States (Area 0)
LS age: 661
Options: (V6-Bit, E-Bit, R-Bit, DC-Bit)
LS Type: Link-LSA (Interface: GigabitEthernet2)
Link State ID: 8 (Interface ID)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0x6209
Length: 56
Router Priority: 1
Link Local Address: FE80::5054:FF:FE11:C0FE
Number of Prefixes: 1
Prefix Address: 2001:A:A:20::
Prefix Length: 64, Options: None
Link LSAs (Type 8) - R2's Perspective
R2#show ipv6 ospf data link adv-router 1.1.1.1
OSPFv3 Router with ID (2.2.2.2) (Process ID 1)
Link (Type-8) Link States (Area 0)
LS age: 631
Options: (V6-Bit, E-Bit, R-Bit, DC-Bit)
LS Type: Link-LSA (Interface: GigabitEthernet2)
Link State ID: 7 (Interface ID)
Advertising Router: 1.1.1.1
LS Seq Number: 80000001
Checksum: 0x128F
Length: 56
Router Priority: 1
Link Local Address: FE80::5054:FF:FE12:722F
Number of Prefixes: 1
Prefix Address: 2001:A:A:10::
Prefix Length: 64, Options: None
R2#show ipv6 ospf data link adv-router 2.2.2.2
OSPFv3 Router with ID (2.2.2.2) (Process ID 1)
Link (Type-8) Link States (Area 0)
LS age: 586
Options: (V6-Bit, E-Bit, R-Bit, DC-Bit)
LS Type: Link-LSA (Interface: GigabitEthernet1)
Link State ID: 7 (Interface ID)
Advertising Router: 2.2.2.2
LS Seq Number: 80000001
Checksum: 0x6224
Length: 56
Router Priority: 1
Link Local Address: FE80::5054:FF:FE0E:A92
Number of Prefixes: 1
Prefix Address: 2001:A:A:30::
Prefix Length: 64, Options: None
LS age: 606
Options: (V6-Bit, E-Bit, R-Bit, DC-Bit)
LS Type: Link-LSA (Interface: GigabitEthernet2)
Link State ID: 8 (Interface ID)
Advertising Router: 2.2.2.2
LS Seq Number: 80000001
Checksum: 0xCD06
Length: 56
Router Priority: 1
Link Local Address: FE80::5054:FF:FE08:E390
Number of Prefixes: 1
Prefix Address: 2001:A:A:10::
Prefix Length: 64, Options: None
R2#show ipv6 ospf data link adv-router 3.3.3.3
OSPFv3 Router with ID (2.2.2.2) (Process ID 1)
Link (Type-8) Link States (Area 0)
LS age: 597
Options: (V6-Bit, E-Bit, R-Bit, DC-Bit)
LS Type: Link-LSA (Interface: GigabitEthernet1)
Link State ID: 7 (Interface ID)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0x9BC1
Length: 56
Router Priority: 1
Link Local Address: FE80::5054:FF:FE16:D3E5
Number of Prefixes: 1
Prefix Address: 2001:A:A:30::
Prefix Length: 64, Options: None
Link LSAs (Type 8) - R3's Perspective
R3#show ipv6 ospf database link adv-router 1.1.1.1
OSPFv3 Router with ID (3.3.3.3) (Process ID 1)
Link (Type-8) Link States (Area 0)
LS age: 680
Options: (V6-Bit, E-Bit, R-Bit, DC-Bit)
LS Type: Link-LSA (Interface: GigabitEthernet2)
Link State ID: 8 (Interface ID)
Advertising Router: 1.1.1.1
LS Seq Number: 80000001
Checksum: 0x59CE
Length: 56
Router Priority: 1
Link Local Address: FE80::5054:FF:FE1A:6C95
Number of Prefixes: 1
Prefix Address: 2001:A:A:20::
Prefix Length: 64, Options: None
R3#show ipv6 ospf database link adv-router 2.2.2.2
OSPFv3 Router with ID (3.3.3.3) (Process ID 1)
Link (Type-8) Link States (Area 0)
LS age: 617
Options: (V6-Bit, E-Bit, R-Bit, DC-Bit)
LS Type: Link-LSA (Interface: GigabitEthernet1)
Link State ID: 7 (Interface ID)
Advertising Router: 2.2.2.2
LS Seq Number: 80000001
Checksum: 0x6224
Length: 56
Router Priority: 1
Link Local Address: FE80::5054:FF:FE0E:A92
Number of Prefixes: 1
Prefix Address: 2001:A:A:30::
Prefix Length: 64, Options: None
R3#show ipv6 ospf database link adv-router 3.3.3.3
OSPFv3 Router with ID (3.3.3.3) (Process ID 1)
Link (Type-8) Link States (Area 0)
LS age: 627
Options: (V6-Bit, E-Bit, R-Bit, DC-Bit)
LS Type: Link-LSA (Interface: GigabitEthernet1)
Link State ID: 7 (Interface ID)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0x9BC1
Length: 56
Router Priority: 1
Link Local Address: FE80::5054:FF:FE16:D3E5
Number of Prefixes: 1
Prefix Address: 2001:A:A:30::
Prefix Length: 64, Options: None
LS age: 737
Options: (V6-Bit, E-Bit, R-Bit, DC-Bit)
LS Type: Link-LSA (Interface: GigabitEthernet2)
Link State ID: 8 (Interface ID)
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0x6209
Length: 56
Router Priority: 1
Link Local Address: FE80::5054:FF:FE11:C0FE
Number of Prefixes: 1
Prefix Address: 2001:A:A:20::
Prefix Length: 64, Options: None
Notice that each router has a different set of type 8 LSAs. How can this be? The Link LSA is only flooded on the interface. It is not flooded area-wide. The link LSA is used to associate an interface ID with a link local address, and prefix address. The prefix address is the IP address that belongs to the interface. This is how a router learns what link local address to use for the next-hop address for routes that are installed in the RIB.
Intra-Area Prefix LSAs (Type 9)
R1#show ipv6 ospf data prefix adv-router 1.1.1.1
OSPFv3 Router with ID (1.1.1.1) (Process ID 1)
Intra Area Prefix Link States (Area 0)
LS age: 705
LS Type: Intra-Area-Prefix-LSA
Link State ID: 0
Advertising Router: 1.1.1.1
LS Seq Number: 80000002
Checksum: 0x5005
Length: 56
Referenced LSA Type: 2001
Referenced Link State ID: 0
Referenced Advertising Router: 1.1.1.1
Number of Prefixes: 2
Prefix Address: 2001:A:A:10::
Prefix Length: 64, Options: None, Metric: 64
Prefix Address: 2001:A:A:20::
Prefix Length: 64, Options: None, Metric: 64
R1#show ipv6 ospf data prefix adv-router 2.2.2.2
OSPFv3 Router with ID (1.1.1.1) (Process ID 1)
Intra Area Prefix Link States (Area 0)
LS age: 623
LS Type: Intra-Area-Prefix-LSA
Link State ID: 0
Advertising Router: 2.2.2.2
LS Seq Number: 80000003
Checksum: 0x70BE
Length: 44
Referenced LSA Type: 2001
Referenced Link State ID: 0
Referenced Advertising Router: 2.2.2.2
Number of Prefixes: 1
Prefix Address: 2001:A:A:10::
Prefix Length: 64, Options: None, Metric: 64
R1#show ipv6 ospf data prefix adv-router 3.3.3.3
OSPFv3 Router with ID (1.1.1.1) (Process ID 1)
Intra Area Prefix Link States (Area 0)
LS age: 626
LS Type: Intra-Area-Prefix-LSA
Link State ID: 0
Advertising Router: 3.3.3.3
LS Seq Number: 80000003
Checksum: 0x26F0
Length: 44
Referenced LSA Type: 2001
Referenced Link State ID: 0
Referenced Advertising Router: 3.3.3.3
Number of Prefixes: 1
Prefix Address: 2001:A:A:20::
Prefix Length: 64, Options: None, Metric: 64
LS age: 626
LS Type: Intra-Area-Prefix-LSA
Link State ID: 7168
Advertising Router: 3.3.3.3
LS Seq Number: 80000001
Checksum: 0x5EC6
Length: 44
Referenced LSA Type: 2002
Referenced Link State ID: 7
Referenced Advertising Router: 3.3.3.3
Number of Prefixes: 1
Prefix Address: 2001:A:A:30::
Prefix Length: 64, Options: None, Metric: 0
This LSA advertises non-link-local prefix addresses. We actually saw these prefixes in the Link LSA, however that LSA is only flooded on the link. The Intra-Area prefix LSA is flooded area-wide.
Notice that 2001:A:A:30::/64 has a metric of 0 because it was generated by the DR (pseudonode). The Type 1 LSA includes each attached router’s cost to the pseduonode.
The referenced LSA type value of 2001 indicates this is referencing a Type 1 LSA, and a value of 2002 indicates that it is referencing a Type 2 LSA.
