Dell PowerEdge M520 Dell PowerConnect M6220/M6348/M8024 Switches Configuration - Page 128

IPv6 Example

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While optional in IPv4, router advertisement is mandatory in IPv6. Router advertisements specify the network prefix(es) on a link which can be used by receiving hosts, in conjunction with an EUI64 identifier, to auto configure a host's address. Routers have their network prefixes configured and may use EUI64 or manually configured interface IDs. In addition to one or more global addresses, each IPv6 interface 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 unique Next 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 is to tunnel IPv6 packets inside IPv4 to reach remote IPv6 islands. When a packet is sent over such a link, it is encapsulated in IPv4 in order to traverse an IPv4 network and has the IPv4 headers removed at the other end of the tunnel. CLI Example In Figure 6-1, two devices are connected as shown in the diagram. The VLAN 15 routing interface on both devices connects to an IPv4 backbone network where OSPF is used as the dynamic routing protocol to exchange IPv4 routes. OSPF allows device 1 and device 2 to learn routes to each other (from the 20.20.20.x network to the 10.10.10.x network and vice versa). The VLAN 2 routing interface on both devices connects to the local IPv6 network. OSPFv3 is used to exchange IPv6 routes between the two devices. The tunnel interface allows data to be transported between the two remote IPv6 networks over the IPv4 network. Figure 6-1. IPv6 Example VInLteArfNace20/2 IVntLeArfaNce105/1 Network VInLtAerNfac1e50/1 VILnAterNfac2e 0/2 Device 1 console# config ip routing ipv6 unicast-routing router ospf router-id 1.1.1.1 exit 128 IPv6

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128
IPv6
While optional in IPv4, router advertisement is mandatory in IPv6. Router advertisements specify the
network prefix(es) on a link which can be used by receiving hosts, in conjunction with an EUI64
identifier, to auto configure a host’s address. Routers have their network prefixes configured and may use
EUI64 or manually configured interface IDs. In addition to one or more global addresses, each IPv6
interface 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 unique
Next 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 is
to tunnel IPv6 packets inside IPv4 to reach remote IPv6 islands. When a packet is sent over such a link, it
is encapsulated in IPv4 in order to traverse an IPv4 network and has the IPv4 headers removed at the
other end of the tunnel.
CLI Example
In Figure 6-1, two devices are connected as shown in the diagram. The VLAN 15 routing interface on
both devices connects to an IPv4 backbone network where OSPF is used as the dynamic routing protocol
to exchange IPv4 routes. OSPF allows device 1 and device 2 to learn routes to each other (from the
20.20.20.x network to the 10.10.10.x network and vice versa). The VLAN 2 routing interface on both
devices connects to the local IPv6 network. OSPFv3 is used to exchange IPv6 routes between the two
devices. The tunnel interface allows data to be transported between the two remote IPv6 networks over
the IPv4 network.
Figure 6-1.
IPv6 Example
Device 1
console# config
ip routing
ipv6 unicast-routing
router ospf
router-id 1.1.1.1
exit
Network
VLAN 2
VLAN 15
VLAN 2
VLAN 15