Transition Mechanisms.ppt - Transitioning IPv4 to IPv6 2007...

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© 2007 – 2010, Cisco Systems, Inc. All rights reserved. Cisco Public 1 Transitioning IPv4 to IPv6
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2 © 2007 – 2010, Cisco Systems, Inc. All rights reserved. Cisco Public IPv6 Co-existence Solutions Tunneling Services Connect Islands of IPv6 or IPv4 IPv4 over IPv6 IPv6 over IPv4 Dual-Stack Enterprise Co-existence strategy Translation Services Connect to the IPv6 community IPv4 IPv6 Internet consumers Remote Workers International Sites Government Agencies IPv6 IPv4
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3 © 2007 – 2010, Cisco Systems, Inc. All rights reserved. Cisco Public Dual Stack
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4 © 2007 – 2010, Cisco Systems, Inc. All rights reserved. Cisco Public Dual-Stack Techniques Hosts and network devices run both IPv4 and IPv6 at the same time. This technique is useful as a temporary transition, but it adds overhead and uses many resources. Cisco IOS Software is IPv6 ready. As soon as IPv4 and IPv6 configurations are complete, the interface is dual stacked and it forwards both IPv4 and IPv6 traffic. Drawback of dual stacking includes: The additional resources required to keep and process dual routing tables, routing protocol topology tables, etc. The higher administrative overhead, troubleshooting, and monitoring, is more complex.
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5 © 2007 – 2010, Cisco Systems, Inc. All rights reserved. Cisco Public Dual-Stack Example The FastEthernet 0/0 interface of R1 is dual stacked. It is configured with an IPv4 and an IPv6 address. Also notice that for each protocol, the addresses on R1 and R2 are on the same network. R2 10.10.10.1 R1 R1(config)# interface fa0/0 R1(config-if)# ip address 10.10.10.1 255.255.255.0 R1(config-if)# ipv6 address 2001:12::1/64 R1(config-if)# ^Z R1# 10.10.10.2 2001:12::1/64 2001:12::2/64
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6 © 2007 – 2010, Cisco Systems, Inc. All rights reserved. Cisco Public Dual-Stack Example The output confirms that the Fa0/0 interface is operational and uses the IPv4 address. R1# show ip interface fa0/0 FastEthernet0/0 is up, line protocol is up Internet address is 10.10.10.1/24 Broadcast address is 255.255.255.255 Address determined by setup command MTU is 1500 bytes Helper address is not set Directed broadcast forwarding is disabled Outgoing access list is not set Inbound access list is not set Proxy ARP is enabled Local Proxy ARP is disabled Security level is default Split horizon is enabled ICMP redirects are always sent ICMP unreachables are always present <output omitted> R2 10.10.10.1 R1 10.10.10.2 2001:12::1/64 2001:12::2/64
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7 © 2007 – 2010, Cisco Systems, Inc. All rights reserved. Cisco Public Dual-Stack Example The output confirms that the Fa0/0 interface is operational and also uses the IPv6 address. R1# show ipv6 interface fa0/0 FastEthernet0/0 is up, line protocol is up IPv6 is enabled, link-local address is FE80::219:56FF:FE2C:9F60 Global unicast address(es): 2001:12::1, subnet is 2001:12::/64 Joined group address(es): FF02::1 FF02::2 FF02::1:FF00:1 FF02::1:FF2C:9F60 MTU is 1500 bytes ICMP error messages limited to one every 100 milliseconds ICMP redirects are enabled ND DAD is enabled, number of DAD attempts: 1 ND reachable time is 30000 milliseconds <output omitted> R2 10.10.10.1 R1 10.10.10.2 2001:12::1/64 2001:12::2/64
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8 © 2007 – 2010, Cisco Systems, Inc. All rights reserved. Cisco Public Tunneling
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