NAME
aggregate − tool for aggregating CIDR networks
SYNOPSIS
aggregate [options]
DESCRIPTION
aggregate(8) is a tool for aggregating CIDR networks. Input is read from stdin and output is written to stdout. It undestands IPv4 networks represented as network/prefix, network/netmask and start_address - end_addres. It is able to read input in any one of these formats and output in the same or a different format.
It is also able to limit the maximum and minimum prefix length that will be output. This can be used to filter, for instance ignoring all networks with a prefix longer than 24 bits. That is all networks smaller than a traditional Class C.
OPTIONS
−h, −−help:
Display terse help.
−i, −−input−format FORMAT:
Format for input. One of:
prefix:
network/prefix.
e.g. 10.0.0.0/24
netmask:
network/netmask.
e.g. 10.0.0.0/255.255.255.0
range:
start_ip - end_ip.
e.g. 10.0.0.0 - 10.0.0.255
Note that while prefix and netmask types imply a single CIDR network, a range may span multiple CIDR networks.
The default is prefix.
−M, −−maximum−format FORMAT:
Supress the output of networks whose prefix is greater than this value. Valid values 0-32. -1 for no maximum prefix. Default is -1.
−m, −−minimum−format FORMAT:
Supress netorks whose prefix is less than this value. Valid values 0-32. -1 for no minimum prefix. Default is -1.
−o, −−output−format FORMAT:
Format for intput. Available formats are as per −−input−format. Defailt is prefix.
EXAMPLES
Example 1:
Aggregate some prefixes.
aggregate
10.0.0.0/19
10.0.255.0/24
10.1.0.0/24
10.1.1.0/24
10.1.2.0/24
10.1.2.0/25
10.1.2.128/25
10.1.3.0/25
^D
10.0.0.0/19
10.0.255.0/24
10.1.0.0/23
10.1.2.0/24
10.1.3.0/25
Example 2:
Aggregate some prefixes ignoring anything smaller than a /24.
aggregate -M 24
10.0.0.0/19
10.0.255.0/24
10.1.0.0/24
10.1.1.0/24
10.1.2.0/24
10.1.2.0/25
10.1.2.128/25
10.1.3.0/25
^D
10.0.0.0/19
10.0.255.0/24
10.1.0.0/23
10.1.2.0/24
Example 3:
Same as example 1 but input is in netmask format and output is in range format
aggregate -i
netmask
10.0.0.0/255.255.224.0
10.0.255.0/255.255.255.0
10.1.0.0/255.255.255.0
10.1.1.0/255.255.255.0
10.1.2.0/255.255.255.0
10.1.2.0/255.255.255.128
10.1.2.128/255.255.255.128
10.1.3.0/255.255.255.128
^D
10.0.0.0 - 10.0.31.255
10.0.255.0 - 10.0.255.255
10.1.0.0 - 10.1.1.255
10.1.2.0 - 10.1.2.255
10.1.3.0 - 10.1.3.127
AUTHOR
Horms <horms [AT] verge.au>