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The BGP Large Communities attribute was introduced in Feb 2017 with RFC 8092.
The BGP Large Communities Attribute is similar to the BGP Communities Attribute except that it has 3 components instead of two and each of which are 4 octets in length. Large Communities bring additional functionality and convenience over traditional communities, specifically the fact that the GLOBAL part below is now 4 octets wide allowing seamless use in networks using 4-byte ASNs.
GLOBAL:LOCAL1:LOCAL2 This is the format to define Large Community values.

  • To configure a standard large community filter, run the following command:

set routing large-community-list {standard <large-community-list-name>| seq-standard<integer>} {deny|permit} [large-community <large-community-number>]

  • To configure an expanded large community filter, run the following command:

set routing large-community-list {expanded <large-community-list-name>| seq-expanded <integer>{deny|permit} regex <line>

The following example configures a standard large community filter:

admin@Xorplus# set routing large-community-list standard LargeCom deny large-community 6215:22:33
admin@Xorplus# commit
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