This is the command aggregate that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
aggregate - optimise a list of route prefixes to help make nice short filters
aggregate [-m max-length] [-o max-opt-length] [-p default-length] [-q] [-t] [-v]
Takes a list of prefixes in conventional format on stdin, and performs two optimisations
to attempt to reduce the length of the prefix list.
The first optimisation is to remove any supplied prefixes which are superfluous because
they are already included in another supplied prefix. For example, 220.127.116.11/24 would be
removed if 18.104.22.168/17 was also supplied.
The second optimisation identifies adjacent prefixes that can be combined under a single,
shorter-length prefix. For example, 22.214.171.124/24 and 126.96.36.199/24 can be combined into
the single prefix 188.8.131.52/23.
Sets the maximum prefix length for entries read from stdin max_length bits. The
default is 32. Prefixes with longer lengths will be discarded prior to processing.
Sets the maximum prefix length for optimisation to max-opt-length bits. The default
is 32. Prefixes with longer lengths will not be subject to optimisation.
Sets the default prefix length. There is no default; without this option a prefix
without a mask length is treated as invalid. Use -p 32 -m 32 -o 32 to aggregate a
list of host routes specified as bare addresses, for example.
-q Sets quiet mode -- instructs aggregate never to generate warning messages or other
output on stderr.
-t Silently truncate prefixes that seem to have an inconsistent prefix: e.g. an input
prefix 184.108.40.206/24 would be truncated to 220.127.116.11/24. Without this option an
input prefix 18.104.22.168/24 would not be accepted, and a warning about the
inconsistent mask would be generated.
-v Sets verbose mode. This changes the output format to display the source line number
that the prefix was obtained from, together with a preceding "-" to indicate a
route that can be suppressed, or a "+" to indicate a shorter-prefix aggregate that
was added by aggregate as an adjacency optimisation. Note that verbose output
continues even if -q is selected.
Aggregate exits 0 on success, and >0 if an error occurs.
The following list of prefixes:
is optimised as followed by aggregate (output shown using the -v flag):
aggregate: maximum prefix length permitted will be 24
[ 0] + 22.214.171.124/21
[ 1] - 126.96.36.199/22
[ 2] - 188.8.131.52/22
[ 3] 184.108.40.206/22
[ 4] 220.127.116.11/22
[ 5] 18.104.22.168/22
[ 0] + 22.214.171.124/21
[ 6] - 126.96.36.199/22
[ 7] - 188.8.131.52/22
[ 8] - 184.108.40.206/23
[ 9] 220.127.116.11/19
[ 10] 18.104.22.168/21
[ 0] + 22.214.171.124/15
[ 11] - 126.96.36.199/16
[ 12] - 188.8.131.52/16
Note that 184.108.40.206/22 and 220.127.116.11/22 were combined under the single prefix
18.104.22.168/21, and 22.214.171.124/23 was suppressed because it was included in
126.96.36.199/22. The number in square brackets at the beginning of each line indicates
the original line number, or zero for new prefixes that were introduced by aggregate.
The output without the -v flag is as follows:
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