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Fix: bgp route selection
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186526
2022-12-28 01:14:15 +08:00
parent db8827f83e
commit dcfe9c677a
5 changed files with 50 additions and 23 deletions
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40
lib/10-community-transit.conf
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@ -1,27 +1,32 @@
function pub_add_communities(int ASN; int PeerType) {
# DIRECT PEER
if (PeerType=0) then {
bgp_large_community.add((LOCAL_ASN, 110, 0));
bgp_large_community.add((LOCAL_ASN, 110, 2));
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 {
bgp_large_community.add((LOCAL_ASN, 110, 0));
bgp_large_community.add((LOCAL_ASN, 110, 1));
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 {
bgp_large_community.add((LOCAL_ASN, 110, 10));
if bgp_large_community !~ [(LOCAL_ASN, 110, *)] then bgp_large_community.add((LOCAL_ASN, 110, 10));
# DOWNSTREAM
} else if (PeerType=20) then {
bgp_large_community.add((LOCAL_ASN, 110, 20));
if bgp_large_community !~ [(LOCAL_ASN, 110, *)] then bgp_large_community.add((LOCAL_ASN, 110, 20));
}
# Finished (LOCAL_ASN, 110, *);
if (LOCAL_ASN, 120, POP) ~ bgp_large_community then bgp_large_community.add((LOCAL_ASN, 120, POP));
if (LOCAL_ASN, 121, REGION) ~ bgp_large_community then bgp_large_community.add((LOCAL_ASN, 121, REGION));
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;
@ -67,18 +72,33 @@ function pub_process_communities(int ASN; int PeerType) {
return true;
}
function pub_process_path() {
# Delete Self eBGP Confed Path.
bgp_path.delete([4200000000..4225479999]);
# Route is via Europe & Africa & Middle East
if bgp_large_community ~ [(LOCAL_ASN, 122, 100), (LOCAL_ASN, 122, 300..310), (LOCAL_ASN, 122, 600)] then bgp_path.prepend(LOCAL_ASN);
# Route is via America
if bgp_large_community ~ [(LOCAL_ASN, 122, 200..299)] then bgp_path.prepend(LOCAL_ASN);
# Route is via East Asia & Oceania
if bgp_large_community ~ [(LOCAL_ASN, 122, 400..500)] then bgp_path.prepend(LOCAL_ASN);
# Self PoP
if (LOCAL_ASN, 120, POP) ~ bgp_large_community then bgp_path.delete(LOCAL_ASN);
}
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;
return true;
}
function transit_export_filter(int ASN) {
# Delete Self eBGP Confed Path.
bgp_path.delete([4200000000..4225479999]);
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 return false;
pub_add_communities(ASN, 10);
if pub_process_communities(ASN, 10) then return true;
else return false;
}