Brocade Communications Systems Brocate Ethernet Access Switch 6910 - Manual (Page 1072)

1022 Brocade 6910 Ethernet Access Switch Configuration Guide
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Setting the Switch’s IP Address (IP Version 6)
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• You can also manually configure the global unicast address by entering the full address
and prefix length.
• You can configure multiple IPv6 global unicast addresses per interface, but only one link-local
address per interface.
• If a duplicate link-local address is detected on the local segment, this interface is disabled and
a warning message displayed on the console. If a duplicate global unicast address is detected
on the network, the address is disabled on this interface and a warning message displayed on
the console.
• When an explicit address is assigned to an interface, IPv6 is automatically enabled, and
cannot be disabled until all assigned addresses have been removed.
Parameters
These parameters are displayed:
• VLAN – ID of a configured VLAN which is to be used for management access. By default, all
ports on the switch are members of VLAN 1. However, the management station can be
attached to a port belonging to any VLAN, as long as that VLAN has been assigned an IP
address. (Range: 1-4093)
• Address Type – Defines the address type configured for this interface.
• Global – Configures an IPv6 global unicast address with a full IPv6 address including the
network prefix and host address bits, followed by a forward slash, and a decimal value
indicating how many contiguous bits (from the left) of the address comprise the prefix (i.e.,
the network portion of the address).
• EUI-64 (Extended Universal Identifier) – Configures an IPv6 address for an interface using
an EUI-64 interface ID in the low order 64 bits.
• When using EUI-64 format for the low-order 64 bits in the host portion of the address,
the value entered in the IPv6 Address field includes the network portion of the
address, and the prefix length indicates how many contiguous bits (starting at the left)
of the address comprise the prefix (i.e., the network portion of the address). Note that
the value specified in the IPv6 Address field may include some of the high-order host
bits if the specified prefix length is less than 64 bits. If the specified prefix length
exceeds 64 bits, then the bits used in the network portion of the address will take
precedence over the interface identifier.
• IPv6 addresses are 16 bytes long, of which the bottom 8 bytes typically form a unique
host identifier based on the device’s MAC address. The EUI-64 specification is
designed for devices that use an extended 8-byte MAC address. For devices that still
use a 6-byte MAC address (also known as EUI-48 format), it must be converted into
EUI-64 format by inverting the universal/local bit in the address and inserting the
hexadecimal number FFFE between the upper and lower three bytes of the MAC
address.
For example, if a device had an EUI-48 address of 28-9F-18-1C-82-35, the
global/local bit must first be inverted to meet EUI-64 requirements (i.e., 1 for globally
defined addresses and 0 for locally defined addresses), changing 28 to 2A. Then the
two bytes FFFE are inserted between the OUI (i.e., organizationally unique identifier, or
company identifier) and the rest of the address, resulting in a modified EUI-64
interface identifier of 2A-9F-18-FF-FE-1C-82-35.
• This host addressing method allows the same interface identifier to be used on
multiple IP interfaces of a single device, as long as those interfaces are attached to
different subnets.