IPv6 Extending the IP protocol towards the future. Andrew Zorowitz 4/26/05

Why IPv6? Running out of IPv4 Addresses Running out of IPv4 Addresses Random assignment of IPv4 Addresses Random assignment of IPv4 Addresses IPv4 designed for a much less robust global network. IPv4 designed for a much less robust global network. Designed with security and QoS in mind. Designed with security and QoS in mind.

Address Pool Sizes IPv4 supports 2 32 addresses IPv4 supports 2 32 addresses That’s approximately 4 billion IP addressesThat’s approximately 4 billion IP addresses IPv6 supports addresses IPv6 supports addresses That’s approximately 3.4 * addressesThat’s approximately 3.4 * addresses

Why not yet? Lack, until recently, of IPv6 routing protocols. Lack, until recently, of IPv6 routing protocols. Cost of equipment upgrades. Cost of equipment upgrades. NAT and DHCP have extended useful lifetime of IPv4, but the value of both of those is quickly ending. NAT and DHCP have extended useful lifetime of IPv4, but the value of both of those is quickly ending.

Addressing Format IPv6 addresses are shown in the format: 1343:4326:34D3:0000:0000:3BC3:2354:0054/48or1343:4326:34D3::3BC3:2354:54/48

IPv6 Address Types Unicast Unicast Multicast Multicast Anycast Anycast

Functions Neighbor Discovery Neighbor Discovery Router Discovery Router Discovery Stateless Autoconfiguration Stateless Autoconfiguration Duplicate Address DetectionDuplicate Address Detection Path MTU Discovery Path MTU Discovery No fragmentationNo fragmentation

IPv6 Routing Routing Protocols Routing Protocols RIPngRIPng OSPFv3OSPFv3 IS-IS Extensions for IPv6IS-IS Extensions for IPv6 MP-BGPMP-BGP EIGRP for IPv6EIGRP for IPv6 Static RoutingStatic Routing

Differences Between IPv4 and IPv6 Routing Interface based as opposed to network based. Interface based as opposed to network based. Uses link-local addresses for identifying machines Uses link-local addresses for identifying machines Not enabled by default on Cisco routers Not enabled by default on Cisco routers Enabled with the command: ipv6 unicast-routingEnabled with the command: ipv6 unicast-routing

Transition Mechanisms Dual Stack Backbones Dual Stack Backbones IPv6 over IPv4 Tunneling IPv6 over IPv4 Tunneling IPv6 over Dedicated Data Links IPv6 over Dedicated Data Links

For More Information ts/sw/iosswrel/ps5187/products_conf iguration_guide_chapter09186a0080 1d65f5.html#wp ts/sw/iosswrel/ps5187/products_conf iguration_guide_chapter09186a0080 1d65f5.html#wp ts/sw/iosswrel/ps5187/products_conf iguration_guide_chapter09186a0080 1d65f5.html#wp ts/sw/iosswrel/ps5187/products_conf iguration_guide_chapter09186a0080 1d65f5.html#wp Try it out! The CCIE pods (CCNA pods 1-8) and some of our other pods support IPv6! Try it out! The CCIE pods (CCNA pods 1-8) and some of our other pods support IPv6!