Community lists are composed of a group of destinations which share a common property. Community lists allow you to administer actions on a configured group instead of having to execute identical commands for each member.
The following example displays a community list configuration:
A:ALA-B>config>router>policy-options# info
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community "eastern" members "100:200"
community "western" members "100:300"
community "northern" members "100:400"
community "southern" members "100:500"
community "headquarters" members "100:1000"
policy-statement "1"
entry 1
to
protocol bgp
neighbor 10.10.10.104
exit
action accept
. . .
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A:ALA-B>config>router>policy-options#