• The switch must always be configured with a l ink-lo cal address . Therefore an y
configuration process that enables IPv6 functionality, or assigns a global unicast
address to the switch, will also automatically generate a link-local unicast address.
The prefix length for a link-local address is fixed at 64 bits, and the host portion of
the default address is based on the modified EUI-64 (Extended Universal Identifier)
form of the interface identifier (i.e., the physical MAC address). Alternatively , you
can manually configure the link-local address by enterin g th e full a ddres s wi th the
network prefix FE80.
• To connect to a larger netw ork wit h mu lti ple s ubnet s, you mu st co nfigur e a gl obal
unicast address. There are several alternatives to configuring this address type:
- The global unicast address can be automati cally confi gured by tak ing the
network prefix from router advertisements observed on the local interface, and
using the modified EUI-64 form of the interface identifier to automatically create
the host portion of the address.
- It can be manually configured by specifying the entire network prefix and pre fix
length, and using the EUI-64 form of the interface iden tifier to automat ically
create the low-order 64 bits in the host portion of the address.
- You can also manually configure the gl obal un icas t addr ess b y ente ring the ful l
address and prefix length.
- Or you can include a general prefix for the network portion o f the addres s (as
described under “Configuring an IPv6 General Network Prefix” on page 4-15).
When using this method, remember that the prefix leng th speci fied on the IPv6
Configuration page must include both the length of the general prefix and any
contiguous bits (from the left of the spec ified addres s) that are added to the
general prefix to form the extended network portion of the add ress.
• You can configure multiple IPv6 globa l uni cast a ddres se s per inte rface, but on ly
one link-local address per interface.
• If a duplicate link-local address is detected on the loca l segm ent, thi s interface is
disabled and a warning message displayed on the console. If a duplicate glo bal
unicast address is detected on the network, th e address is disable d on this
interface and a warning message displayed on the console.
Command Attributes
• VLAN – ID of the configured VLAN (1-4093). By defa ult, al l ports on t he stac k are
members of VLAN 1. However, the management station can be attached to a por t
belonging to any VLAN, as long as that VLAN has been assign ed an IP ad dress.
• IPv6 Address Processing – Enables IPv6 on an interface. Note that when an
explicit address is assigned to an interface, IPv6 is autom atically enable d, and
cannot be disabled until all assigned addresses have been re moved.
• IPv6 Interface Status – Shows if IPv6 inter face addres s configurat ion sta te is
stable (Enabled) or unstable (Stale).
• IPv6 Default Gateway – Sets the IPv6 address of the defau lt next h op route r to
use when no other routing information is known about an IPv6 a ddress.
- The specified gatew ay is only valid if routing is dis abled us i ng th e IP / General /
Global Settings screen (see page 19-4) or no other routing information is known
4-10
Basic Management Tasks
4