7.8.1.0 - Force10 Networks

01 Discard the packet.
10 Discard the packet and send an ICMP Parameter Problem Code 2 message to the
packet’s Source IP Address identifying the unknown option type
11 Discard the packet and send an ICMP Parameter Problem, Code 2 message to the
packet’s Source IP Address only if the Destination IP Address is not a multicast address.
The second byte contains the Option Data Length.
The third byte specifies whether the information can change en route to the destination. The value is 1
if it can change; the value is 0 if it cannot change.
Addressing
IPv6 addresses are normally written as eight groups of four hexadecimal digits, where each group is
separated by a colon (:). For example, 2001:0db8:0000:0000:0000:0000:1428:57ab is a valid IPv6 address.
If one or more four-digit group(s) is 0000, the zeros may be omitted and replaced with two colons(::). For
example, 2001:0db8:0000:0000:0000:0000:1428:57ab can be shortened to 2001:0db8::1428:57ab. Only
one set of double colons is supported in a single address. Any number of consecutive 0000 groups may be
reduced to two colons, as long as there is only one double colon used in an address. Leading zeros in a
group can also be omitted (as in ::1 for localhost).
All the addresses in the following list are all valid and equivalent.
• 2001:0db8:0000:0000:0000:0000:1428:57ab
• 2001:0db8:0000:0000:0000::1428:57ab
• 2001:0db8:0:0:0:0:1428:57ab
• 2001:0db8:0:0::1428:57ab
• 2001:0db8::1428:57ab
• 2001:db8::1428:57ab
IPv6 networks are written using Classless Inter-Domain Routing (CIDR) notation. An IPv6 network (or
subnet) is a contiguous group of IPv6 addresses the size of which must be a power of two; the initial bits of
addresses, which are identical for all hosts in the network, are called the network's prefix.
A network is denoted by the first address in the network and the size in bits of the prefix (in decimal),
separated with a slash. Since a single host is seen as a network with a 128-bit prefix, host addresses may be
written with a following /128.
For example, 2001:0db8:1234::/48 stands for the network with addresses
2001:0db8:1234:0000:0000:0000:0000:0000 through 2001:0db8:1234:ffff:ffff:ffff:ffff:ffff
FTOS Configuration Guide, version 7.8.1.0 413