Subnet Masking - ZyXEL Communications GS3700 Series User Manual

Table 260 Reserved Mult icast Address ( cont inued)
MULTICAST ADDRESS
FF0A:0:0:0:0:0:0:0
FF0B:0:0:0:0:0:0:0
FF0C:0:0:0:0:0:0:0
FF0D:0:0:0:0:0:0:0
FF0E:0:0:0:0:0:0:0
FF0F:0:0:0:0:0:0:0

Subnet Masking

Bot h an I Pv6 address and I Pv6 subnet m ask com pose of 128- bit binary digit s, which are divided
int o eight 16- bit blocks and writ t en in hexadecim al not at ion. Hexadecim al uses four bit s for each
charact er ( 1 ~ 10, A ~ F) . Each block's 16 bit s are t hen represent ed by four hexadecim al
charact ers. For exam ple, FFFF: FFFF: FFFF: FFFF: FC00: 0000: 0000: 0000.
Interface ID
I n I Pv6, an int erface I D is a 64- bit ident ifier. I t ident ifies a physical int erface ( for exam ple, an
Et hernet port ) or a virt ual int erface ( for exam ple, t he m anagem ent I P address for a VLAN) . One
int erface should have a unique int erface I D.
EUI-64
The EUI - 64 ( Ext ended Unique I dent ifier) defined by t he I EEE ( I nst it ut e of Elect rical and Elect ronics
Engineers) is an int erface I D form at designed t o adapt wit h I Pv6. I t is derived from t he 48- bit ( 6-
byt e) Et hernet MAC address as shown next . EUI - 64 insert s t he hex digit s fffe bet ween t he t hird and
fourt h byt es of t he MAC address and com plem ent s t he sevent h bit of t he first byt e of t he MAC
address. See t he following exam ple.
Table 261
M AC
Table 262
EUI - 6 4
Stateless Autoconfiguration
Wit h st at eless aut oconfigurat ion in I Pv6, addresses can be uniquely and aut om at ically generat ed.
Unlike DHCPv6 ( Dynam ic Host Configurat ion Prot ocol version six) which is used in I Pv6 st at eful
aut oconfigurat ion, t he owner and st at us of addresses don't need t o be m aint ained by a DHCP
server. Every I Pv6 device is able t o generat e it s own and unique I P address aut om at ically when
I Pv6 is init iat ed on it s int erface. I t com bines t he prefix and t he int erface I D ( generat ed from it s own
Et hernet MAC address, see
When I Pv6 is enabled on a device, it s int erface aut om at ically generat es a link- local address
( beginning wit h fe80) .
When t he int erface is connect ed t o a net work wit h a rout er and t he Swit ch is set t o aut om at ically
obt ain an I Pv6 net work prefix from t he rout er for t he int erface, it generat es
Appendix B IPv6
00 : 13 : 49
02 : 13 : 49 : FF
I nt erface I D and
GS3700/XGS3700 Series User's Guide
: 12 : 34 : 56
: FE : 12 : 34 : 56
EUI - 64) t o form a com plet e I Pv6 address.
519
1
anot her address which