OSPFv3

标签：

Part 1: OSPFv2 vs. OSPFv3

Link-Local Address

IPv6 link-local address are ideal for this purpose. An IPv6 link-local address enables a device on the same link and only on that link(subnet). Packets with a source or destination link-local address cannot be routed beyond the link from where the packet originated.

• Source IPv6 address: This is the IPv6 link-local address of the exit interface.
• Destination IPv6 address: OSPFv3 packets can be sent to a unicast address using the neighbor IPv6 link-local address. They can also be sent using a multicast addess. The FF02::5 address is the all OSPF router address, while the FF02::6 is the DR/BDR multicast address.

Part 2: Configuring OSPFv3

Steps to Configure OSPFv3:

Step 1: Enable IPv6 unicast routing: ipv6 unicast-routing

Step 2: (Optional) Configure link-local address.

Step 3: Configure a 32-bit router ID in OSPFv3 router configuration mode using the router-id rid command.

Step 4: Configure optional routing specifics such as adjusting the reference bandidth.

Step 5: (Optional) Configure OSPFv3 interface specific settings. For example, adjust the interface bandwidth.

Step 6: Enable IPv6 routing by using the ipv6 ospf area command.

R1(config)#ipv6 unicast-routing
R1(config)#
R1(config)#interface g0/0
R1(config-if)#description R1 LAN
R1(config-if)#ipv6 address 2001:DB8:CAFE:1::1/64
R1(config-if)#no shutdown
R1(config-if)#
R1(config-if)#interface s0/0/0
R1(config-if)#description link to R2
R1(config-if)#ipv6 address 2001:DB8:CAFE:A001::1/64
R1(config-if)#clock rate 128000
R1(config-if)#no shutdown
R1(config-if)#
R1(config-if)#interface s0/0/1
R1(config-if)#description Link to R3
R1(config-if)#ipv6 address 2001:DB8:CAFE:A003::1/64
R1(config-if)#no shutdown
R1(config-if)#end
R1#

show ipv6 interface brief

You will find Link-local addresses are automatically created when an IPv6 unicast address is assigned to the interface. Global unicast address is assigned to the interface. Global unicast addresses are not required on an interface; However, IPv6 link-local addresses are.

Unless configured manually, Cisco routes create the link-local address using FE80::/10 prefix and the EUI-64 process. EUI-64 involves using the 48-bit Ehternet MAC address, inserting FFFE in the middle and flipping the sevent bit. For serial interface, Cisco uses the MAC address of an Ethernet interface.

Link-local addresses created using the EUI-64 format or in some cases, random interface IDs, make it difficult to recognize and remember those address. Because IPv6 routing protocols use IPv6 link-local addresses for unicast addressing and next-hop address information in the routing table, It is common practice to make it an easily recognizable address. You can assign the same link-local address because the link-local address is only required for local communications.

R1(config)#interface g0/0
R1(config-if)#ipv6 address FE80::1 link-local
R1(config-if)#exit
R1(config)#interface s0/0/0
R1(config-if)#ipv6 address FE80::1 link-local
R1(config-if)#exit
R1(config)#interface s0/0/1
R1(config-if)#ipv6 address FE80::1 link-local
R1(config-if)#exit

A link-local address has a prefix within the range FE80 - FEBF. When an address begins with this hextet(16-bit segment) the link-local keyword must follow the address.

OSPFv3 Router ID

R1(config)#ipv6 router ospf 10
R1(config-rtr)#router-id 1.1.1.1
R1(config-rtr)#auto-cost reference-bandwdth 1000
R1(config-rtr)#end
R1#clear ipv6 ospf process
R1#show ipv6 protocols

Enabling OSPFv3 on Interfaces

R1(config)#interface g0/0
R1(config-if)#ipv6 ospf 10 area 0
R1(config-if)#
R1(config-if)#interface s0/0/0
R1(config-if)#ipv6 ospf 10 area 0
R1(config-if)#
R1(config-if)#interface s0/0/1
R1(config-if)#ipv6 ospf 10 area 0
R1(config-if)#end
R1#show ipv6 ospf interface brief

Verify OSPFv3 command:

show ipv6 ospf neighbor

show ipv6 protocols

show ipv6 ospf interface {brief}

show ipv6 route ospf

OSPFv3

标签：

原文地址：http://www.cnblogs.com/elewei/p/4785036.html