Dell PowerConnect M6348 Configuration Manual

Also see for PowerEdge M520: Manual Command reference guide Owner's manual Information update Release notes

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Dell PowerConnect M6348 Configuration Manual Manual pdf 128 page image

128 IPv6While optional in IPv4, router advertisement is mandatory in IPv6. Router advertisements specify thenetwork prefix(es) on a link which can be used by receiving hosts, in conjunction with an EUI64identifier, to auto configure a host’s address. Routers have their network prefixes configured and may useEUI64 or manually configured interface IDs. In addition to one or more global addresses, each IPv6interface also has an auto-configured link-local address which is:• Allocated from part of the IPv6 unicast address space• Not visible off the local link• Not globally uniqueNext hop addresses computed by routing protocols are usually link-local.During a transition period, a global IPv6 Internet backbone may not be available. The solution of this isto tunnel IPv6 packets inside IPv4 to reach remote IPv6 islands. When a packet is sent over such a link, itis encapsulated in IPv4 in order to traverse an IPv4 network and has the IPv4 headers removed at theother end of the tunnel.CLI ExampleIn Figure 6-1, two devices are connected as shown in the diagram. The VLAN 15 routing interface onboth devices connects to an IPv4 backbone network where OSPF is used as the dynamic routing protocolto exchange IPv4 routes. OSPF allows device 1 and device 2 to learn routes to each other (from the20.20.20.x network to the 10.10.10.x network and vice versa). The VLAN 2 routing interface on bothdevices connects to the local IPv6 network. OSPFv3 is used to exchange IPv6 routes between the twodevices. The tunnel interface allows data to be transported between the two remote IPv6 networks overthe IPv4 network.Figure 6-1. IPv6 ExampleDevice 1console# configip routingipv6 unicast-routingrouter ospfrouter-id 1.1.1.1exitInterface 0/1 Interface 0/1Interface 0/2 Interface 0/2NetworkVLAN 2VLAN 15VLAN 2VLAN 15