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6-6
IPv6 Management Security Features
Authorized IP Managers for IPv6
Notes If you do not enter a value for the ipv6-mask parameter when you configure an
authorized IPv6 address, the switch automatically uses
FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF as the default mask (see “Configuring
Authorized IP Managers for Switch Access” on page 6-5).
If you have ten or fewer management and/or operator stations for which you
want to authorize access to the switch, it may be more efficient to configure
them by entering each IPv6 address with the default mask in a separate ipv6
authorized-managers command.
When used in a mask, “FFFF” specifies that each bit in the corresponding 16-
bit (hexadecimal) block of an authorized station’s IPv6 address must be
identical to the same “on” or “off” setting in the IPv6 address entered in the
ipv6 authorized-managers command. (The binary equivalent of FFFF is
1111 1111 1111 1111, where 1 requires the same “on” or “off” setting in an
authorized address.)
For example, as shown in Figure 6-1, if you configure a link-local IPv6 address
of FE80::202:B3FF:FE1E:8329 with a mask of
FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF, only a station having an IPv6 address of
FE80::202:B3FF:FE1E:8329 has management access to the switch.
Figure 6-1. Mask for Configuring a Single Authorized IPv6 Manager Station
Configuring Multiple Station Access
To authorize multiple stations to access the switch without having to re-enter
the ipv6 authorized-managers command for each station, carefully select the
IPv6 address of an authorized IPv6 manager and an associated mask to
authorize a range of IPv6 addresses.
As shown in Figure 6-2, if a bit in any of the 4-bit binary representations of a
hexadecimal value in a mask is “on” (set to 1), then the corresponding bit in
the IPv6 address of an authorized station must match the ”on” or “off’ setting
of the same bit in the IPv6 address you enter with the ipv6 authorized-managers
command.
1st
Block
2nd
Block
3rd
Block
4th
Block
5th
Block
6th
Block
7th
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8th
Block
Manager- or Operator-Level Access
IPv6 Mask FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF The “FFFF” in each hexadecimal block
of the mask specifies that only the exact
value of each bit in the corresponding
block of the IPv6 address is allowed.
This mask allows management access
only to a station having an IPv6 address
of FE80::202:B3FF:FE1E:8329.
IPv6 Address FE80 0000 0000 0000 202 B3FF FE1E 8329