Module 4 Lesson 2: Routing with OSPFv3 protocol

Module 4 Lesson 2: Routing with OSPFv3 protocol

Objective

Upon completion of this lesson , you will be able to :

Ø Describe how the OSPFv3 routing protocol is supported in IPv6

Ø Describe the enhancements made to OSPFv3 to support IPv6

Lesson outline

Ø OSPF for IPv6

Ø Cisco IOS OSPFv3 configuration example

Ø Cisco IOS OSPFv3 commands

1 OSPF for IPv6

Ø Similar to IPv4

Same mechanisms, but rewrite of the protocol

Ø Updated features for IPv6

·        All IPv4 addressing semantics are removed

·        IPv6 addresses carried in payload

·        Link-local addresses  used as source

·        IPv6 transport

·        OSPFv3 is enabled per link, not network

·        OSPFv3 requires the router be running CEF

Note:

¨     OSPF for IPv6 is currently supported in Cisco IOS

¨     No longer does the OSPF process us local a IPv4 addresses, for Router ID, all these semantic have been removed.

¨     No longer does OSPF carry ip address in the OSPF header, they are only carried in the payload

¨     OSPFv3 uses link-local addresses to communicate locally and for next-hop attributes(except in the case of virtual link)

¨     OSPFv3 is enabled per link and identifies which network are attached to that link for propagation.

Ø Router ID ,area ID and link state ID remain 32 bits

Not derived from an IPv6 address

Ø Router-LSA and network-LSA do not contain addresses , only 32-bit identifiers

Ø LSA’s now have a flooding scope defining a radius

•         Link-local

•         Area

•         AS

Ø Handling/forwarding of unknown LSA’s supported

Ø Uses IPv6 link-local multicast addresses

•         FF02::5àOSPF routers

•         FF02::6 àOSPF designated routers(DR .BDR)

2 Cisco IOS OSPFv3 configuration example

2.1 OSPFv3 example map

::0--àRouter2(Eth0)---LAN1—(Eth0)Router1(Eth1)—LAN2

2.2 IP address

Devices name	Interface	IP address	Remark
Router2	Eth0	Fe80::260:3eff:fe47:1530
LAN1		2001:db8:1:1::/64
Router1	Eth0
Router1	Eth1
LAN2		2001:db8:1:2::/64

2.3 OSPFv3 configuration file

Router2#

interface  eth0

ipv6 address 2001:db8:1:1::/64 eui-64

ipv6 ospf 99 area 0.0.0.0

ipv6 router ospf 99

area 0.0.0.0 range 2001:db8:1::/48

 

Router1

interface  eth0

ipv6 address 2001:db8:1:2::/64 eui-64

ipv6 ospf 99 area 0.0.0.0

interface eth1

ipv6 address 2001:db8:1:1::/64 eui-64

ipv6 ospf area 0.0.0.0

ipv6 router ospf 99

router-id 11.11.11.1

area 0.0.0.0 range 2001:db8:1::/48

3 Cisco IOS OSPFv3 commands

show ipv6 ospf [process-id][area-id]interface [int]

show ipv6 ospf [process-id][area-id]

clear ipv6 ospf force-spf

4Summary

in this lesson , you learned to :

Ø describe how the OSPFv3 routing protocol is supported in IPv6

Ø describe the enhancements made to OSPFv3 to support IPv6