Ospfv3 News version 2

Saturday 15 November 2014 Fred Bovy
IPv6 For Life +33781248989
IPv6 For Life
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1. OSPFv3 is redesigned for
IPv6. The OSPF Architecture
remains the same but it is
adapted for IPv6.
In IPv4 there is one subnet
per interface. In IPv6, the
same interface may have
several prefixes. Therefore
OSPFv3 runs per link and not
per subnet. 
2. Authentification has been
removed from OSPFv3 as,
security is supposed to be
assumed by IPSec, it has
been removed from OSPFv3.
3. The database has been
modified with two new LSAs
and two renamed LSAs.
There is no more Addresses
in Type 1 and Type 2 LSA,
only Topological. The
addresses have been moved
to a new LSA, the Intra-Area-
Prefix LSA. The Link-State LSA
are announced with a new
type of LSA.
4. There are more options in
the OSPF messages, the ‘R-
bit’ and “V6-bi” have been
added. The R-bit is set when
the router is participating in
the routing process. The V6-
bit, is used when the router
can manage IPv6 routes.
5. There are now possibility
to use many separates
instances of OSPFv3
OSPFV3 NEWS
11 Nov 2014

IPv6 For Life +33781248989
Hello Protocol
With OSPF, initialisation begin with the Hello Protocol. Each router advertises its Router-ID and the
default parameters to form neighbour relationship: Area-ID, Hello-Interval, Dead-Interval.
The Hello protocol can also be used on mutipoint network to elect the Designater Router and its
Backup.
IPv6, Src: fe80::c802:fff:fe06:8 (fe80::c802:fff:fe06:8), Dst: ff02::5 (ff02::5)
Open Shortest Path First
OSPF Header
Version: 3
Message Type: Hello Packet (1)
Packet Length: 36
Source OSPF Router: 10.0.0.2 (10.0.0.2)
Area ID: 0.0.0.0 (0.0.0.0) (Backbone)
Checksum: 0x1d78 [correct]
Instance ID: IPv6 unicast AF (0)
Reserved: 00
OSPF Hello Packet
Interface ID: 5
Router Priority: 1
Options: 0x000013 (R, E, V6)
Hello Interval [sec]: 10
Router Dead Interval [sec]: 40
Designated Router: 0.0.0.0 (0.0.0.0)
Backup Designated Router: 0.0.0.0 (0.0.0.0)

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From Down to 2-WAY
Once two neighbours have verified that they can be neighbours, they may become Adjacent. Adjacent
which means that it synchronises its Database with the Neighbour. On Multi access network, a Designated
Router and and a Backup Designated Router are elected to synchronise all the neighbours of a multipoint
network and to generate a LSA listing all neighbours on the behalf of all the neighbours.
Types of OSPF Networks

IPv6 For Life +33781248989
DBD Synchronisation
EXSTART. Each Router sends a DBD with I, M and MS bits set, highest Router-ID wins and become the
Master. EXCHANGE. The Master synchronises the exchanges and generate the initial Sequence. Only
LSA headers are transmitted in DBD packets. If a router notices that an LSA is not up to date it request
it with an LSA Request. EXLOAD. When it is finished, M bit is cleared, they are FULL.

IPv6 For Life +33781248989
The MTU is in the DBD and will be used to verify that both ends agree on the MTU.
OSPF Header
Version: 3
Message Type: DB Description (2)
Packet Length: 28
Area ID: 0.0.0.0 (0.0.0.0) (Backbone)
Checksum: 0x267c [correct]
Reserved: 00
OSPF DB Description
Reserved: 0
Options: 0x000013 (R, E, V6)
Interface MTU: 1500
Reserved: 0
DB Description: 0x07 (I, M, MS)
DD Sequence: 7384

During the Initialisation process, the DBD and the LS Request/Update/Ack occur concurrently.
We have made a very simple lab and capture all trafﬁc between R1 and R2.
Below are some signiﬁcant packets from OSPFv3 Initialization
HELLO
OSPF Header
Version: 3
Message Type: Hello Packet (1)
Packet Length: 40
Area ID: 0.0.0.0 (0.0.0.0) (Backbone)
Checksum: 0xff6e [correct]
Reserved: 00
OSPF Hello Packet
Interface ID: 5
Router Priority: 1
Options: 0x000013 (R, E, V6)
Hello Interval [sec]: 10
Router Dead Interval [sec]: 40
Designated Router: 10.0.0.1 (10.0.0.1)
Backup Designated Router: 10.0.0.2 (10.0.0.2)
Active Neighbor: 10.0.0.2 (10.0.0.2)
Database Description Packet
DATABASE DESCRIPTION PACKET
OSPF Header
Version: 3
Packet Length: 28
Area ID: 0.0.0.0 (0.0.0.0) (Backbone)
Checksum: 0x267c [correct]
Reserved: 00
OSPF DB Description
Reserved: 0
Options: 0x000013 (R, E, V6)
.... .... .... .0.. .... .... = AT: Not set
IPv6 For Life +33781248989

.... .... .... ..0. .... .... = L: Not set
.... .... .... ...0 .... .... = AF: Not set
.... .... .... .... ..0. .... = DC: Not set
.... .... .... .... ...1 .... = R: Set
.... .... .... .... .... 0... = N: Not set
.... .... .... .... .... .0.. = MC: Not set
.... .... .... .... .... ..1. = E: Set
.... .... .... .... .... ...1 = V6: Set
Interface MTU: 1500
Reserved: 0
.... 0... = R: OOBResync bit is NOT set
.... .1.. = I: Init bit is SET
.... ..1. = M: More bit is SET
.... ...1 = MS: Master/Slave bit is SET
DD Sequence: 7384
OSPF Header
Version: 3
Packet Length: 28
Area ID: 0.0.0.0 (0.0.0.0) (Backbone)
Checksum: 0x23e9 [correct]
Reserved: 00
OSPF DB Description
Reserved: 0
Options: 0x000013 (R, E, V6)
.... .... .... .0.. .... .... = AT: Not set
.... .... .... ..0. .... .... = L: Not set
.... .... .... ...0 .... .... = AF: Not set
.... .... .... .... ..0. .... = DC: Not set
.... .... .... .... ...1 .... = R: Set
.... .... .... .... .... 0... = N: Not set
.... .... .... .... .... .0.. = MC: Not set
.... .... .... .... .... ..1. = E: Set
.... .... .... .... .... ...1 = V6: Set
Interface MTU: 1500
Reserved: 0
.... .1.. = I: Init bit is SET
DD Sequence: 8044
OSPF Header
Version: 3
Packet Length: 88
Area ID: 0.0.0.0 (0.0.0.0) (Backbone)
Checksum: 0x7649 [correct]
Reserved: 00
OSPF DB Description
Reserved: 0
Options: 0x000013 (R, E, V6)
.... .... .... .0.. .... .... = AT: Not set
.... .... .... ..0. .... .... = L: Not set
.... .... .... ...0 .... .... = AF: Not set
.... .... .... .... ..0. .... = DC: Not set
.... .... .... .... ...1 .... = R: Set
.... .... .... .... .... 0... = N: Not set
.... .... .... .... .... .0.. = MC: Not set
.... .... .... .... .... ..1. = E: Set
.... .... .... .... .... ...1 = V6: Set
Interface MTU: 1500
IPv6 For Life +33781248989

Reserved: 0
DB Description: 0x02 (M)
.... .0.. = I: Init bit is NOT set
.... ...0 = MS: Master/Slave bit is NOT set
DD Sequence: 7384
LSA Header
LS Age: 376 seconds
Do Not Age: False
LS Type: Router-LSA (0x2001)
Link State ID: 0.0.0.0
Advertising Router: 10.0.0.1 (10.0.0.1)
LS Sequence Number: 0x80000003
LS Checksum: 0x8a7a
Length: 24
LSA Header
LS Age: 416 seconds
Do Not Age: False
LS Type: Link-LSA (0x0008)
LS Checksum: 0xc5dc
Length: 44
LSA Header
LS Age: 438 seconds
Do Not Age: False
LS Type: Intra-Area-Prefix-LSA (0x2009)
LS Checksum: 0x7c02
Length: 52
OSPF Header
Version: 3
Packet Length: 188
Area ID: 0.0.0.0 (0.0.0.0) (Backbone)
Checksum: 0x0f55 [correct]
Reserved: 00
OSPF DB Description
Reserved: 0
Options: 0x000013 (R, E, V6)
.... .... .... .0.. .... .... = AT: Not set
.... .... .... ..0. .... .... = L: Not set
.... .... .... ...0 .... .... = AF: Not set
.... .... .... .... ..0. .... = DC: Not set
.... .... .... .... ...1 .... = R: Set
.... .... .... .... .... 0... = N: Not set
.... .... .... .... .... .0.. = MC: Not set
.... .... .... .... .... ..1. = E: Set
.... .... .... .... .... ...1 = V6: Set
Interface MTU: 1500
Reserved: 0
DB Description: 0x01 (MS)
.... .0.. = I: Init bit is NOT set
.... ..0. = M: More bit is NOT set
DD Sequence: 7385
LSA Header
LS Age: 35 seconds
Do Not Age: False
IPv6 For Life +33781248989

LS Checksum: 0x1293
Length: 56
LSA Header
LS Age: 143 seconds
Do Not Age: False
LS Checksum: 0x5484
Length: 40
LSA Header
LS Age: 26 seconds
Do Not Age: False
LS Checksum: 0x6076
Length: 40
LSA Header
LS Age: 144 seconds
Do Not Age: False
LS Type: Network-LSA (0x2002)
LS Checksum: 0x419c
Length: 32
LSA Header
LS Age: 35 seconds
Do Not Age: False
LS Checksum: 0x4596
Length: 32
LSA Header
LS Age: 304 seconds
Do Not Age: False
LS Checksum: 0xa6d4
Length: 52
LSA Header
LS Age: 168 seconds
Do Not Age: False
LS Checksum: 0xd0a7
Length: 52
LSA Header
LS Age: 27 seconds
Do Not Age: False
LS Checksum: 0xfa7a
Length: 52
LINK STATE REQUEST
OSPF Header
Version: 3
Message Type: LS Request (3)
IPv6 For Life +33781248989

Packet Length: 112
Area ID: 0.0.0.0 (0.0.0.0) (Backbone)
Checksum: 0xf85b [correct]
Reserved: 00
Link State Request
Reserved: 0
Link State Request
Reserved: 0
Link State Request
Reserved: 0
Link State Request
Reserved: 0
Link State Request
Reserved: 0
Link State Request
Reserved: 0
Link State Request
Reserved: 0
Link State Request
Reserved: 0
LINK STATE UPDATE
OSPF Header
Version: 3
Message Type: LS Update (4)
Packet Length: 376
Area ID: 0.0.0.0 (0.0.0.0) (Backbone)
Checksum: 0x5001 [correct]
Reserved: 00
LS Update Packet
Number of LSAs: 8
Router-LSA (Type: 0x2001)
LS Age: 36 seconds
Do Not Age: False
IPv6 For Life +33781248989

LS Checksum: 0x1293
Length: 56
Flags: 0x00
.... 0... = W: NO Wild-card multicast receiver
.... .0.. = V: NO Virtual link endpoint
.... ..0. = E: NO AS boundary router
.... ...0 = B: NO Area border router
Options: 0x000033 (DC, R, E, V6)
.... .... .... .0.. .... .... = AT: Not set
.... .... .... ..0. .... .... = L: Not set
.... .... .... ...0 .... .... = AF: Not set
.... .... .... .... ..1. .... = DC: Set
.... .... .... .... ...1 .... = R: Set
.... .... .... .... .... 0... = N: Not set
.... .... .... .... .... .0.. = MC: Not set
.... .... .... .... .... ..1. = E: Set
.... .... .... .... .... ...1 = V6: Set
Router Interfaces:
Type: 2 (Connection to a transit network)
Reserved: 0
Metric: 1
Interface ID: 7
Neighbor Interface ID: 7
Neighbor Router ID: 10.0.0.2
Reserved: 0
Metric: 1
Interface ID: 6
LS Age: 144 seconds
Do Not Age: False
LS Checksum: 0x5484
Length: 40
Flags: 0x00
.... .... .... .0.. .... .... = AT: Not set
.... .... .... ..0. .... .... = L: Not set
.... .... .... ...0 .... .... = AF: Not set
.... .... .... .... ..1. .... = DC: Set
.... .... .... .... ...1 .... = R: Set
.... .... .... .... .... 0... = N: Not set
.... .... .... .... .... .0.. = MC: Not set
.... .... .... .... .... ..1. = E: Set
.... .... .... .... .... ...1 = V6: Set
Router Interfaces:
Reserved: 0
Metric: 1
Interface ID: 5
LS Age: 27 seconds
Do Not Age: False
LS Checksum: 0x6076
Length: 40
Flags: 0x00
IPv6 For Life +33781248989

.... .... .... .0.. .... .... = AT: Not set
.... .... .... ..0. .... .... = L: Not set
.... .... .... ...0 .... .... = AF: Not set
.... .... .... .... ..1. .... = DC: Set
.... .... .... .... ...1 .... = R: Set
.... .... .... .... .... 0... = N: Not set
.... .... .... .... .... .0.. = MC: Not set
.... .... .... .... .... ..1. = E: Set
.... .... .... .... .... ...1 = V6: Set
Router Interfaces:
Reserved: 0
Metric: 1
Interface ID: 5
Network-LSA (Type: 0x2002)
LS Age: 145 seconds
Do Not Age: False
LS Checksum: 0x419c
Length: 32
Reserved: 0
.... .... .... .0.. .... .... = AT: Not set
.... .... .... ..0. .... .... = L: Not set
.... .... .... ...0 .... .... = AF: Not set
.... .... .... .... ..1. .... = DC: Set
.... .... .... .... ...1 .... = R: Set
.... .... .... .... .... 0... = N: Not set
.... .... .... .... .... .0.. = MC: Not set
.... .... .... .... .... ..1. = E: Set
.... .... .... .... .... ...1 = V6: Set
Attached Router: 10.0.0.2
Network-LSA (Type: 0x2002)
LS Age: 36 seconds
Do Not Age: False
LS Checksum: 0x4596
Length: 32
Reserved: 0
.... .... .... .0.. .... .... = AT: Not set
.... .... .... ..0. .... .... = L: Not set
.... .... .... ...0 .... .... = AF: Not set
.... .... .... .... ..1. .... = DC: Set
.... .... .... .... ...1 .... = R: Set
.... .... .... .... .... 0... = N: Not set
.... .... .... .... .... .0.. = MC: Not set
.... .... .... .... .... ..1. = E: Set
.... .... .... .... .... ...1 = V6: Set
Intra-Area-Prefix-LSA (Type: 0x2009)
LS Age: 305 seconds
Do Not Age: False
LS Checksum: 0xa6d4
Length: 52
# prefixes: 1
IPv6 For Life +33781248989

Referenced LS type 0x2001 (Router-LSA)
Referenced Link State ID: 0.0.0.0
Referenced Advertising Router: 10.0.0.2
PrefixLength: 128
PrefixOptions: 0x02 (LA)
.... 0... = P: Propagate bit is NOT set
.... .0.. = MC: Multicast capability bit is NOT set
.... ..1. = LA: LocalAddress capability bit is SET
.... ...0 = NU: NoUnicast capability bit is NOT set
Metric: 0
Address Prefix: 2001:db8::2
LS Age: 169 seconds
Do Not Age: False
LS Checksum: 0xd0a7
Length: 52
# prefixes: 1
PrefixLength: 128
Metric: 0
LS Age: 28 seconds
Do Not Age: False
LS Checksum: 0xfa7a
Length: 52
# prefixes: 1
PrefixLength: 128
Metric: 0
LINK STATE ACKNOWLEDGEMENT
OSPF Header
Version: 3
Message Type: LS Acknowledge (5)
Packet Length: 216
Area ID: 0.0.0.0 (0.0.0.0) (Backbone)
Checksum: 0x99ef [correct]
Reserved: 00
LSA Header
LS Age: 36 seconds
Do Not Age: False
IPv6 For Life +33781248989

LS Checksum: 0x1293
Length: 56
LSA Header
LS Age: 144 seconds
Do Not Age: False
LS Checksum: 0x5484
Length: 40
LSA Header
LS Age: 27 seconds
Do Not Age: False
LS Checksum: 0x6076
Length: 40
LSA Header
LS Age: 145 seconds
Do Not Age: False
LS Checksum: 0x419c
Length: 32
LSA Header
LS Age: 36 seconds
Do Not Age: False
LS Checksum: 0x4596
Length: 32
LSA Header
LS Age: 305 seconds
Do Not Age: False
LS Checksum: 0xa6d4
Length: 52
LSA Header
LS Age: 169 seconds
Do Not Age: False
LS Checksum: 0xd0a7
Length: 52
LSA Header
LS Age: 28 seconds
Do Not Age: False
LS Checksum: 0xfa7a
Length: 52
LSA Header
LS Age: 1 seconds
Do Not Age: False
IPv6 For Life +33781248989

LS Checksum: 0xf7a6
Length: 44
LSA Header
LS Age: 1 seconds
Do Not Age: False
LS Sequence Number: 0x8000000a
LS Checksum: 0x413b
Length: 72
THE NEW LSA INTRODUCED IN OSPFv3
Intra-area-Preﬁx-LSA (Type 9)
The Router and Network LSAs do not advertise addresses anymore. Addresses are transported by Intr-Area-Preﬁx
LSA. Below we can see a router advertising a /128 loopback interface address.
LS Age: 305 seconds
Do Not Age: False
LS Checksum: 0xa6d4
Length: 52
# prefixes: 1
PrefixLength: 128
Metric: 0
Link-LSA (Type 8)
The Link LSA permit to advertise the Link-Local Address.
Link-LSA (Type: 0x0008)
LS Age: 417 seconds
Do Not Age: False
LS Checksum: 0xc5dc
Length: 44
Router Priority: 1
.... .... .... .0.. .... .... = AT: Not set
.... .... .... ..0. .... .... = L: Not set
.... .... .... ...0 .... .... = AF: Not set
.... .... .... .... ..1. .... = DC: Set
.... .... .... .... ...1 .... = R: Set
.... .... .... .... .... 0... = N: Not set
.... .... .... .... .... .0.. = MC: Not set
.... .... .... .... .... ..1. = E: Set
.... .... .... .... .... ...1 = V6: Set
Link-local Interface Address: fe80::c801:fff:fe04:8
IPv6 For Life +33781248989

THE LSA WITH NEW NAMES
INTER-AREA-ROUTER LSA (Type 4)
This LSA is generated by an ABR when it receives External LSA Type 5 from a router in its area. It advertises this
ASBR to the other Areas so they can build a route to the next hop of the routes advertised by the ASBR.
R1#sh ipv6 ospf data inter-area router
OSPFv3 Router with ID (10.0.0.1) (Process ID 1)
Inter Area Router Link States (Area 0)
Routing Bit Set on this LSA
LS age: 137
Options: (V6-Bit, E-Bit, R-bit, DC-Bit)
LS Type: Inter Area Router Links
Link State ID: 167772163
Advertising Router: 10.0.0.2
LS Seq Number: 80000001
Checksum: 0x706F
Length: 32
Metric: 1
Destination Router ID: 10.0.0.3
The Inter-Area-Preﬁx LSA (type 3) was called Summary LSA before. By default, an ABR generate one LSA
for each route unless you can summarise the Area with one address which is the typical conﬁguration.
As ABR generate one LSA per route we can say that OSPF is a Distance-Vector protocol between two
areas.
INTER-AREA-PREFIX LSA (Type 3)
R1#sh ipv6 ospf data inter-area prefix
Inter Area Prefix Link States (Area 0)
LS age: 9
LS Type: Inter Area Prefix Links
Link State ID: 0
Checksum: 0x6A4D
Length: 44
Metric: 1
Prefix Address: 2001:DB8::3
Prefix Length: 128, Options: None
R1#
IPv6 For Life +33781248989

OSPF Architecture
Architecture did not change from OSPFv2 and OSPFv3. We still have the concepts of Area, Stub Area
and ABR to interconnect an Area to the backbone Area 0. ASBR are still used to advertise External
Routes.
IPv6 For Life +33781248989

This translates to a hierarchy in routing:
A router will always prefer an Intra Area OSPF Route to any other route for the same destination. Then
the next choice is Inter-Area OSPF Routes, then External Type 1 and ﬁnally External Type 2. This is the
only example I know where the longest match rule is not the preferred rule to select a route.
Example of Multi-Area Autonomous System:
R1, R2 and R3 are in Area 0
R5 is in Stub area 2
R4, R6, R7 R1 and R3 are in Area 1
With a basic conﬁguration we can check OSPFv3 neighbours of each router:
R1>sh ipv6 ospf ne
Neighbor ID Pri State Dead Time Interface ID Interface
10.0.0.2 1 FULL/BDR 00:00:37 6 GigabitEthernet1/0
First remark is that OSPFv3 configure eqch interface as a BROADCAST IPv6 OSPF Interface. This is
why each router is adjacent with a BDP beeing itself the DR as we can check:
R1>sh ipv6 ospf int g0/0
GigabitEthernet0/0 is up, line protocol is up
Link Local Address FE80::C801:FFF:FE97:8, Interface ID 5
Area 0, Process ID 1, Instance ID 0, Router ID 10.0.0.1
Network Type BROADCAST, Cost: 1
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 10.0.0.1, local address FE80::C801:FFF:FE97:8
Backup Designated router (ID) 10.0.0.3, local address FE80::C803:FFF:FE9B:1C
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:05
Index 1/2/2, flood queue length 0
Next 0x0(0)/0x0(0)/0x0(0)
Last flood scan length is 0, maximum is 3
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 10.0.0.3 (Backup Designated Router)
Suppress hello for 0 neighbor(s)
This is a waste of time as the election of the DR/BDR slowdown the convergence.
It also makes the Database bigger and more complex with a Network-LSA for each Gigabit
Interface.
If we got Point-to-Point interface we should configure it as point to point.
R1>show ipv6 ospf database router adv-router 10.0.0.1
Router Link States (Area 0)
LS age: 923
LS Type: Router Links
Link State ID: 0
Checksum: 0x7034
Length: 56
Area Border Router
Number of Links: 2
Link connected to: a Transit Network
IPv6 For Life +33781248989

Link Metric: 1
Local Interface ID: 6
Neighbor (DR) Interface ID: 6
Neighbor (DR) Router ID: 10.0.0.1
Link Metric: 1
LS age: 1411
Link State ID: 0
LS Seq Number: 8000000B
Checksum: 0x3B66
Length: 56
Area Border Router
Number of Links: 2
Link Metric: 1
Link Metric: 1
R2 is an ABR so it has a DB for Area 0 and a database for Area 1. It points to transit network with the
address of the DR. The we need to check the LSA generated by this DR to ﬁnd all neighbours of this
network:
R1>show ipv6 ospf database network adv-router 10.0.0.1
Net Link States (Area 0)
LS age: 1224
LS Type: Network Links
Link State ID: 5 (Interface ID of Designated Router)
Checksum: 0x3F9D
Length: 32
LS age: 219
Checksum: 0x25B6
Length: 32
IPv6 For Life +33781248989

Net Link States (Area 1)
LS age: 1712
Checksum: 0x39A0
Length: 32
LS age: 1714
Checksum: 0x597C
Length: 32
This is overkill and not needed as we just need to know the Router-ID of the Neighbour. Also DR/BDR
election starts with 40 seconds listening and doing nothing so it is really a waste of time when we have a
Point-to-Point.
Let’s conﬁgure all our point to point correctly.:
R6(config)#int g0/0
R6(config-if)#ipv6 ospf network point-to-point
Then R1 neighbours look like:
R1#sh ipv6 ospf neighbor
*Nov 15 18:58:24.439: %SYS-5-CONFIG_I: Configured from console by console
Neighbor ID Pri State Dead Time Interface ID Interface
10.0.0.2 1 FULL/ - 00:00:37 6 GigabitEthernet1/0
R1#
No more DR or BDR on Point-to-Point and if we look a Router LSA, it is much
more simple no more need for pointing to a Network LSA:
R1#sh ipv6 ospf data router adv 10.0.0.1
LS age: 533
Link State ID: 0
Checksum: 0xCCD0
Length: 56
Area Border Router
Number of Links: 2
Link connected to: another Router (point-to-point)
Link Metric: 1
IPv6 For Life +33781248989

Link Metric: 1
LS age: 305
Link State ID: 0
Checksum: 0xA1F7
Length: 56
Area Border Router
Number of Links: 2
Link Metric: 1
Link Metric: 1
Please notice that there is no IPv6 address in the Router and Network LSA, they are in the Int-
Area_Prefix LSA:
R1#sh ipv6 ospf data prefix adv-router 10.0.0.1
Intra Area Prefix Link States (Area 0)
LS age: 1970
LS Type: Intra-Area-Prefix-LSA
Link State ID: 0
Checksum: 0x7207
Length: 52
Referenced LSA Type: 2001
Referenced Link State ID: 0
Number of Prefixes: 1
Prefix Address: 2001:DB8::1
Prefix Length: 128, Options: LA, Metric: 0
We can also check the Inter-Area-Router LSA that R1 and R3 makes to advertise R6 as an ASBR:
R1#sh ipv6 ospf data inter-area router
Inter Area Router Link States (Area 0)
LS age: 1117
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Checksum: 0x8650
Length: 32
Metric: 2
LS age: 736
Checksum: 0x7E58
Length: 32
Metric: 2
R1#
IPv6 For Life +33781248989

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