BGP Large Community Policy

All RegPEX communities use the BGP Large Community format (RFC 8092): Global Administrator : Function : Parameter

Example — on YOUR router, tag routes announced to the RegPEX RS so they are NOT sent to AS64500 (replace 64500 with the target member AS). Large Community is mandatory (RegPEX ASN is 32-bit).

# RegPEX RS'e export filtresinde (kendi router'inda)
if net = 203.0.113.0/24 then {
    bgp_large_community.add((199911, 0, 64500));    # do NOT announce to AS64500
    # bgp_large_community.add((199911, 102, 64500)); # or: prepend 2x toward AS64500
}

/routing/filter/rule
add chain=regpex-out rule="append bgp-large-communities 199911:0:64500; accept;"
# prepend 2x toward AS64500 instead:
#   rule="append bgp-large-communities 199911:102:64500; accept;"
/routing/bgp/connection
set [find name=regpex-rs] output.filter-chain=regpex-out
# NOTE: use 'append' (not 'set') so existing communities are preserved.

set policy-options community RPX-NO-64500 members large:199911:0:64500
set policy-options policy-statement regpex-out term tag then community add RPX-NO-64500
set policy-options policy-statement regpex-out term tag then accept
set protocols bgp group regpex-rs neighbor 95.133.136.1 export regpex-out
# prepend 2x toward AS64500 instead:
#   set policy-options community RPX-PREP2-64500 members large:199911:102:64500
# NOTE: 'community add' preserves existing communities; large: form is required.

Lower local preference for routes from POP #1 (Ankara ODTU Teknokent):

# Bird2 example — filter by POP
if bgp_large_community ~ [(199911, 1003, 1)] then {
    bgp_local_pref = 80;  # prefer other paths
}

Lower local preference for all routes from Istanbul (city ID 2, all POPs):

# Bird2 example — filter by city
if bgp_large_community ~ [(199911, 1004, 2)] then {
    bgp_local_pref = 80;  # prefer other paths
}

Reject all routes from a specific country (e.g. Bulgaria, ISO 3166-1: 100):

# Bird2 example — filter by country
if bgp_large_community ~ [(199911, 1002, 100)] then {
    reject;
}