OSPF is an important pint you must know in CCNA/CCNP/CCIE study. It is important . OSPFv3 is specified in RFC2740. There is a relationship between OSPFv3 for RIPv2 and RIPng, with some high-level similarities in OSPFv2. The most important thing is that OSPFv3 uses the same basic mechanism as OSPFv2the SPF algorithm, flooding, DR election, region, etc. The same is true for constants and variables such as timers and metrics. The other is that the similar relationship between RIPng and RIPv2 is that OSPFv3 is not backward compatible with OSPFv2. Therefore, if you want to use OSPF to route IPv4 and IPv6, you must run both OSPFv2 and OSPFv3.
Compared with OSPF v2
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In addition to the changes in LSA, some changes were also made to the OSPF program. The following changes are the most important:
1. You can view the processing of each link protocol in real time. A single link interface can have multiple IPv6 addresses at the same time.
In fact, a link can belong to multiple subnets, and two interfaces connected to the same link, but interfaces that belong to different IPv6 subnets can still communicate. OSPFv3 changes the OSPFv2 language “link” of the “subnet” and allows the exchange of packets between two areas that belong to the same link but belong to different IPv6 subnets.
2. OSPFv3 routers and network LSAs do not use IPv4 addresses. But the router’s 32-bit rotuer-id still uses ipv4 addresses, but the LSA ID works with IPv6 addresses. Allow OSPFv3 networks to cover existing OSPFv2 networks, work together, and do not interfere with each other.
3. During the establishment of neighbor relationships, OSPFv2 broadcasts and neighbors on NBMA links are identified by their interface addresses, while other types of links are discovered by RID neighbors. OSPFv3 eliminates this contradiction and allows all types The neighbor’s connection is identified by RID.
OSPFv2 packets have a link-local range and they are not forwarded by any router. OSPFv3 uses the router’s link-local IPv6 addresses (these addresses always start with FF80) as the source address and as the next hop address.
4. OSPF’s specific identity verification is removed by IPv6, using an authentication extension header, a standard authentication process.
Because of this, OSPFv3 no longer has its own authentication packet, it just uses IPv6 authentication.
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Configuration case:
1.basic configuration
R1 config：
R1(config)#line console 0
R1(config-line)#exec-timeout 0 0
R1(config-line)#logging synchronous
R1(config-line)#exit
R1(config)#no ip domain-lookup
R1(config)#interface lo0
R1(config-if)#ipv6 address 2001::1/128
R1(config-if)#no shutdown
R1(config-if)#exit
R1(config)#interface f0/0
R1(config-if)#ipv6 address 2012::1/64
R1(config-if)#no shutdown
R1(config-if)#exit
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R2(config)#line console 0
R2(config-line)#exec-timeout 0 0
R2(config-line)#logging synchronous
R2(config-line)#exit
R2(config)#no ip domain-lookup
R2(config)#interface lo0
R2(config-if)#ipv6 address 2002::2/128
R2(config-if)#no shutdown
R2(config-if)#exit
R2(config)#interface f0/0
R2(config-if)#ipv6 address 2012::2/64
R2(config-if)#no shutdown
R2(config-if)#exit
R2(config)#interface f0/1
R2(config-if)#ipv6 address 2020::2/64
R2(config-if)#no shutdown
R2(config-if)#exit
R3#config terminal
R3(config)#line console 0
R3(config-line)#exec-timeout 0 0
R3(config-line)#logging synchronous
R3(config-line)#exit
R3(config)#no ip domain-lookup
R3(config)#interface lo0
R3(config-if)#ipv6 address 2003::3/128
R3(config-if)#no shutdown
R3(config-if)#exit
R3(config)#interface f0/1
R3(config-if)#ipv6 address 2020::3/64
R3(config-if)#no shutdown
R3(config-if)#exit
R4(config)#line console 0
R4(config-line)#exec-timeout 0 0
R4(config-line)#logging synchronous
R4(config-line)#exit
R4(config)#no ip domain-lookup
R4(config)#interface lo0
R4(config-if)#ipv6 address 2004::4/128
R4(config-if)#no shutdown
R4(config-if)#exit
R4(config)#interface f0/1
R4(config-if)#ipv6 address 2020::4/64
R4(config-if)#no shutdown
R4(config-if)#exit
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2.OSPF V3 config
R1(config)#ipv6 unicast-routing
R1(config)#router ospfv3 1
R1(config-router)#router-id 1.1.1.1
R1(config-router)#exit
R1(config)#interface lo0
R1(config-if)#ospfv3 1 ipv6 area 0
R1(config-if)#exit
R1(config)#interface f0/0
R1(config-if)#ospfv3 1 ipv6 area 0
R1(config-if)#exit
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R2(config)#ipv6 unicast-routing
R2(config)#router ospfv3 1
R2(config-router)#router-id 2.2.2.2
R2(config)#interface lo0
R2(config-if)#ospfv3 1 ipv6 area 0
R2(config-if)#exit
R2(config)#interface f0/0
R2(config-if)#ospfv3 1 ipv6 area 0
R2(config-if)#exit
R2(config)#interface f0/1
R2(config-if)#ospfv3 1 ipv6 area 0
R2(config-if)#exit
R2(config)#
R2(config)#
R3(config)#router ospfv3 1
R3(config-router)#router-id 3.3.3.3
R3(config-router)#address-family ipv6 unicast
R3(config-router-af)#exit-address-family
R3(config-router)#exit
R3(config)#interface lo0
R3(config-if)#ospfv3 1 ipv6 area 0
R3(config-if)#exit
R3(config)#interface f0/1
R3(config-if)#ospfv3 1 ipv6 area 0
R3(config-if)#exit
R4(config)#ipv6 unicast-routing
R4(config)#router ospfv3 1
R4(config-router)#router-id 4.4.4.4
R4(config-router)#address-family ipv6 unicast
R4(config-router-af)#exit-address-family
R4(config-router)#exit
R4(config)#interface lo0
R4(config-if)#ospfv3 1 ipv6 area 0
R4(config-if)#exit
R4(config)#interface f0/1
R4(config-if)#ospfv3 1 ipv6 area 0
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3. Check
R1#sho ipv6 ospf neighbor
OSPFv3 Router with ID (1.1.1.1) (Process ID 1)
Neighbor ID Pri State Dead Time Interface ID Interface
2.2.2.2 1 FULL/BDR 00:00:34 3 FastEthernet0/0
R1#
R1#sho ipv6 ospf database
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
1.1.1.1 969 0x80000003 0 1 None
2.2.2.2 1342 0x80000003 0 2 None
3.3.3.3 1342 0x80000002 0 1 None
4.4.4.4 1298 0x80000002 0 1 None
Net Link States (Area 0)
ADV Router Age Seq# Link ID Rtr count
1.1.1.1 1405 0x80000001 3 2
2.2.2.2 1297 0x80000002 4 3
Link (Type-8) Link States (Area 0)
ADV Router Age Seq# Link ID Interface
1.1.1.1 969 0x80000002 3 Fa0/0
2.2.2.2 1407 0x80000001 3 Fa0/0
Intra Area Prefix Link States (Area 0)
ADV Router Age Seq# Link ID Ref-lstype Ref-LSID
1.1.1.1 969 0x80000004 0 0x2001 0
1.1.1.1 1405 0x80000001 3072 0x2002 3
2.2.2.2 1342 0x80000005 0 0x2001 0
2.2.2.2 1342 0x80000001 4096 0x2002 4
3.3.3.3 1338 0x80000003 0 0x2001 0
4.4.4.4 1294 0x80000003 0 0x2001 0
R1#
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