Required Addresses; Ipv6 Address Prefixes - Cisco 7604 Configuration Manual

IPv6 Addresses
The following restrictions apply to anycast addresses:
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Anycast addresses are not supported on FWSM.
Note

Required Addresses

IPv6 hosts must, at a minimum, be configured with the following addresses (either automatically or
manually):
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•
•
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IPv6 routers must, at a minimum, be configured with the following addresses (either automatically or
manually):
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IPv6 Address Prefixes

An IPv6 address prefix, in the format ipv6-prefix/prefix-length, can be used to represent bit-wise
contiguous blocks of the entire address space. The IPv6-prefix must be in the form documented in RFC
2373 where the address is specified in hexadecimal using 16-bit values between colons. The prefix
length is a decimal value that indicates how many of the high-order contiguous bits of the address
comprise the prefix (the network portion of the address). For example, 2001:0DB8:8086:6502::/32 is a
valid IPv6 prefix.
The IPv6 prefix identifies the type of IPv6 address.
type.
Table E-3
Address Type
Unspecified
Loopback
Multicast
Link-Local (unicast) 1111111010
Site-Local (unicast)
Global (unicast)
Anycast
Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM
E-10
An anycast address cannot be used as the source address for an IPv6 packet.
An anycast address cannot be assigned to an IPv6 host; it can only be assigned to an IPv6 router.
A link-local address for each interface.
The loopback address.
The All-Nodes multicast addresses
A Solicited-Node multicast address for each unicast or anycast address.
The required host addresses.
The Subnet-Router anycast addresses for all interfaces for which it is configured to act as a router.
The All-Routers multicast addresses.
IPv6 Address Type Prefixes
Binary Prefix
000...0 (128 bits)
000...1 (128 bits)
11111111
1111111111
All other addresses.
Taken from the unicast address space.
Appendix E
Table E-3 shows the prefixes for each IPv6 address
IPv6 Notation
::/128
::1/128
FF00::/8
FE80::/10
FEC0::/10
Addresses, Protocols, and Ports
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