Are Cost Communities A Real Thing?
I was just reading about cost communities specified in https://tools.ietf.org/html/draft-retana-bgp-custom-decision-00
Where it states that if you set the community to have a point of insertion of 128, it is preferred over local pref? The specific section is this:
ABSOLUTE_VALUE - Indicates that the Cost Community
MUST be considered as the first step in determining
the Degree of Preference of a path.
IGP_COST - Indicates that the Cost Community MUST be
considered after the interior (IGP) distance to the
next-hop has been compared.
EXTERNAL_INTERNAL - Indicates that the Cost Commun-
ity MUST be considered after the paths advertised by
BGP speakers in a neighbouring autonomous system (if
any) have been selected.
BGP_ID - Indicates that the Cost Community MUST be
considered after the BGP Identifier (or
ORIGINATOR_ID [RFC2796]) has been compared.
I want to know if this is implemented by Cisco as I've never heard of this before in my life?