Yep, i'm no expert, but a BGP looking glass seems to suggest that all of the best paths (chosen by AS pathlength?) are not being advertised to peers... But some routes are being advertised? Idk
Router: Palo Alto, CA - US
Command: show ip bgp 104.244.42.193
BGP routing table entry for 104.244.42.0/24
Versions:
Process bRIB/RIB SendTblVer
Speaker 261897778 261897778
Last Modified: Nov 7 06:11:36.675 for 00:02:37
Paths: (4 available, best #3)
Advertised to update-groups (with more than one peer):
0.2 0.3 0.6 0.7
Advertised to peers (in unique update groups):
129.250.47.126 129.250.9.146 128.242.180.62 80.150.168.193
128.241.2.58
Path #1: Received by speaker 0
Not advertised to any peer
13414 13414
116.51.31.10 (metric 14530) from 129.250.0.18 (129.250.0.18)
Origin IGP, localpref 120, valid, confed-internal
Received Path ID 0, Local Path ID 0, version 0
Community: 2914:370 2914:1405 2914:2406 2914:3400 65400:4134 65420:4134 65460:4134
Path #2: Received by speaker 0
Not advertised to any peer
13414 13414
62.73.183.110 (metric 28640) from 129.250.0.30 (129.250.0.30)
Origin IGP, localpref 120, valid, confed-internal
Received Path ID 0, Local Path ID 0, version 0
Community: 2914:370 2914:1204 2914:2205 2914:3200 65400:4134 65420:4134 65460:4134
Path #3: Received by speaker 0
Advertised to update-groups (with more than one peer):
0.2 0.3 0.6 0.7
Advertised to peers (in unique update groups):
129.250.47.126 129.250.9.146 128.242.180.62 80.150.168.193
128.241.2.58
13414 13414
129.250.195.210 (metric 7029) from 129.250.0.115 (129.250.0.167)
Origin IGP, localpref 120, valid, confed-internal, best, group-best
Received Path ID 0, Local Path ID 1, version 261897778
Community: 2914:370 2914:1007 2914:2000 2914:3000 65400:4134 65420:4134 65460:4134
Originator: 129.250.0.167, Cluster list: 0.0.0.6
Path #4: Received by speaker 0
Not advertised to any peer
13414 13414
129.250.195.210 (metric 7029) from 129.250.0.116 (129.250.0.167)
Origin IGP, localpref 120, valid, confed-internal
Received Path ID 0, Local Path ID 0, version 0
Community: 2914:370 2914:1007 2914:2000 2914:3000 65400:4134 65420:4134 65460:4134
Originator: 129.250.0.167, Cluster list: 0.0.0.6