net186-config/lib/10-community-transit.conf

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function pub_add_communities(int ASN; int PeerType) {
# DIRECT PEER
if (PeerType=0) then {
if bgp_large_community !~ [(LOCAL_ASN, 110, *)] then {
bgp_large_community.add((LOCAL_ASN, 110, 0));
bgp_large_community.add((LOCAL_ASN, 110, 2));
}
# PEER via IX
} else if (PeerType=1) then {
if bgp_large_community !~ [(LOCAL_ASN, 110, *)] then {
bgp_large_community.add((LOCAL_ASN, 110, 0));
bgp_large_community.add((LOCAL_ASN, 110, 1));
}
# UPSTREAM
}else if (PeerType=10) then {
if bgp_large_community !~ [(LOCAL_ASN, 110, *)] then bgp_large_community.add((LOCAL_ASN, 110, 10));
# DOWNSTREAM
} else if (PeerType=20) then {
if bgp_large_community !~ [(LOCAL_ASN, 110, *)] then bgp_large_community.add((LOCAL_ASN, 110, 20));
# Self Route
} else if (PeerType=30) then {
if bgp_large_community !~ [(LOCAL_ASN, 110, *)] then bgp_large_community.add((LOCAL_ASN, 110, 30));
}
# Finished (LOCAL_ASN, 110, *);
if bgp_large_community !~ [(LOCAL_ASN, 120, *)] then bgp_large_community.add((LOCAL_ASN, 120, POP));
if bgp_large_community !~ [(LOCAL_ASN, 121, *)] then bgp_large_community.add((LOCAL_ASN, 121, REGION));
# Finished (LOCAL_ASN, 120~130, *);
return true;
}
function pub_preprocess_communities() {
if (LOCAL_ASN, 115, 1) ~ bgp_large_community then bgp_path.prepend(LOCAL_ASN);
if (LOCAL_ASN, 115, 3) ~ bgp_large_community then {
bgp_path.prepend(LOCAL_ASN);
bgp_path.prepend(LOCAL_ASN);
bgp_path.prepend(LOCAL_ASN);
}
if (LOCAL_ASN, 115, 5) ~ bgp_large_community then {
bgp_path.prepend(LOCAL_ASN);
bgp_path.prepend(LOCAL_ASN);
bgp_path.prepend(LOCAL_ASN);
bgp_path.prepend(LOCAL_ASN);
bgp_path.prepend(LOCAL_ASN);
}
# Finished (LOCAL_ASN, 115, *);
return true;
}
function pub_process_communities(int ASN; int PeerType) {
if (65535, 65281) ~ bgp_community then return false;
if (65535, 65282) ~ bgp_community then return false;
if (65535, 65283) ~ bgp_community then return false;
if (LOCAL_ASN, 2, ASN) ~ bgp_large_community then return false;
# PEER
if (PeerType<10) then {
if (LOCAL_ASN, 1, 1) ~ bgp_large_community then return false;
# UPSTREAM
} else if (PeerType=10) then {
if (LOCAL_ASN, 1, 0) ~ bgp_large_community then return false;
# DOWNSTREAM
} else if (PeerType=20) then {
if (LOCAL_ASN, 1, 2) ~ bgp_large_community then return false;
}
return true;
}
function pub_process_path() {
# Delete Self eBGP Confed Path.
bgp_path.delete([4200000000..4225479999]);
# Route is via or locate Europe & Africa & Middle East
if bgp_large_community ~ [(LOCAL_ASN, 122, 100), (LOCAL_ASN, 122, 300..310), (LOCAL_ASN, 122, 600), (LOCAL_ASN, 121, 100), (LOCAL_ASN, 121, 300..310), (LOCAL_ASN, 121, 600)] then bgp_path.prepend(LOCAL_ASN);
# Route is via or locate America
if bgp_large_community ~ [(LOCAL_ASN, 122, 200..299), (LOCAL_ASN, 121, 200..299)] then bgp_path.prepend(LOCAL_ASN);
# Route is via or locate East Asia & Oceania
if bgp_large_community ~ [(LOCAL_ASN, 122, 400..500), (LOCAL_ASN, 121, 200..299)] then bgp_path.prepend(LOCAL_ASN);
# Self PoP
if (LOCAL_ASN, 120, POP) ~ bgp_large_community then {
bgp_path.delete(LOCAL_ASN);
bgp_path.prepend(LOCAL_ASN);
}
pub_preprocess_communities();
}
function transit_import_filter(int ASN) {
if !is_valid() then return false;
pub_add_communities(ASN, 10);
pub_preprocess_communities();
bgp_local_pref = 400 - bgp_path.len * 10;
if LOCAL_ASN ~ bgp_path then bgp_local_pref = 1;
pub_route_controller_specific();
return true;
}
function transit_export_filter(int ASN) {
pub_process_path();
if !is_valid() then return false;
if bgp_large_community ~ [(LOCAL_ASN, 110, 0), (LOCAL_ASN, 110, 10)] then return false;
if bgp_path.last !~ DOWNSTREAM_ASN && source = RTS_BGP then {
print "transit exporter: for ", net, " ASN ", bgp_path.last;
return false;
}
pub_add_communities(ASN, 30);
if pub_process_communities(ASN, 10) then return true;
else return false;
}