Specifications

194 Implementing IBM System Networking 10Gb Ethernet Switches
򐂰 You cannot configure an IPv4 address on an IPv6 interface. Each interface can be
configured with only one address type, either IPv4 or IPv6, but not both. When changing
between IPv4 and IPv6 address formats, the prior address settings for the interface
are discarded.
򐂰 Each IPv6 interface can belong to only one VLAN.
򐂰 Each VLAN can support only one IPv6 interface.
򐂰 Each VLAN can support multiple IPv4 interfaces.
Each IPv6 interface can be configured as a router node or a host node, as follows:
򐂰 A router node’s IP address is configured manually. Router nodes can send
Router Advertisements.
򐂰 A host node’s IP address is autoconfigured. The host nodes listen for Router
Advertisements that convey information about devices on the network. You can manually
assign an IPv6 address to an interface in host mode, or the interface can be assigned an
IPv6 address by an upstream router, using information from router advertisements to
perform stateless auto-configuration.
Complete the following steps to configure IPv6 interfaces:
1. Configure the host nodes interfaces.
To configure host nodes interfaces, run ip6host and ipv6 address <IPv6 address>
<prefix length> [anycast|enable] in the interface configuration mode (Example 5-42).
Example 5-42 Host node interface configuration
AGG-1#conf t
Enter configuration commands, one per line. End with Ctrl/Z.
AGG-1(config)#interface ip 111
AGG-1(config-ip-if)#ip6host
AGG-1(config-ip-if)#ipv6 address fc11::2 64
AGG-1(config-ip-if)#vlan 101
AGG-1(config-ip-if)#enable
AGG-1(config-ip-if)#^Z
AGG-1#
Configure all the interfaces between aggregation and access switches as host nodes,
according to the input information in Chapter 3, “Reference architectures” on page 107.
IPv4 layout for IPv6: An easy method of using the IPv4 layout for the IPv6 implementation
is to configure separate IPv6 interfaces, but to map them to the same VLANs used by IPv4,
thus having two IP interfaces that use a single VLAN.
IPv6 interfaces:
򐂰 All the IPv6 interfaces on point-to-point links, between aggregation and access
switches, used for OSPF routing, are configured as
host nodes with static
IPv6 addresses.
򐂰 All the IPv6 interfaces connected to servers are configured as
router nodes, with Router
Advertisement enabled so the listening hosts can perform stateless auto-configuration.
IPv6 address: If no IPv6 address is specified, the host node is listening for Router
Advertisements for auto-configuration information.