Brocade FastIron Ethernet Switch Layer 3 Routing Configuration Guide - Manual (Page 175)

To override a link-local address that is automatically computed for an interface with a manually
configured address, enter commands such as the following.
device(config)#interface ethernet 3/1
device(config-if-e1000-3/1)#ipv6 address FE80::240:D0FF:FE48:4672 link-local
These commands explicitly configure the link-local address FE80::240:D0FF:FE48:4672 for Ethernet
interface 3/1.
Syntax: ipv6 address ipv6-address link-local
You must specify the ipv6-address parameter in hexadecimal using 16-bit values between colons as
documented in RFC 2373.
The link-local keyword indicates that the router interface should use the manually configured link-local
address instead of the automatically computed link-local address.
Configuring an IPv6 anycast address on an interface
In IPv6, an anycast address is an address for a set of interfaces belonging to different nodes. Sending a
packet to an anycast address results in the delivery of the packet to the closest interface configured with
the anycast address.
An anycast address looks similar to a unicast address, because it is allocated from the unicast address
space. If you assign an IPv6 unicast address to multiple interfaces, it is an anycast address. On the
Brocade device, you configure an interface assigned an anycast address to recognize the address as
an anycast address.
For example, the following commands configure an anycast address on interface 2/1.
device(config)#int e 2/1
device(config-if-e1000-2/1)#ipv6 address 2001:DB8::/64 anycast
Syntax: ipv6 address ipv6-prefix/prefix-length [ anycast ]
IPv6 anycast addresses are described in detail in RFC 1884. See RFC 2461 for a description of how
the IPv6 Neighbor Discovery mechanism handles anycast addresses.
Configuring IPv4 and IPv6 protocol stacks
One situation in which you must configure a router to run both IPv4 and IPv6 protocol stacks is if it is
deployed as an endpoint for an IPv6 over IPv4 tunnel.
Each router interface that will send and receive both IPv4 and IPv6 traffic must be configured with an
IPv4 address and an IPv6 address. (An alternative to configuring a router interface with an IPv6 address
is to explicitly enable IPv6 using the ipv6 enable command. For more information about using this
command, refer to
Configuring a link-local IPv6 address on an interface on page 174.)
To configure a router interface to support both the IPv4 and IPv6 protocol stacks, use commands such
as the following.
device(config)#ipv6 unicast-routing
device(config)#interface ethernet 3/1
device(config-if-e1000-3/1)#ip address 10.168.1.1 255.255.255.0
device(config-if-e1000-3/1)#ipv6 address 2001:DB8:12d:1300::/64 eui-64
These commands globally enable IPv6 routing and configure an IPv4 address and an IPv6 address for
Ethernet interface 3/1.
Syntax: [no] ipv6 unicast-routing
To disable IPv6 traffic globally on the router, enter the no form of this command.
Configuring an IPv6 anycast address on an interface
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