Can't connect to cogentco.com

[gnarlymarley]

I noticed that cogent turns on the peering with he.net every so often specifically for 2001:550::/32.  I do not know why they do this.  There are enough peers from cogent that peer with he.net, that I would expect the BGP path to be relayed across, such as level3, tata, and abovenet.  Interestingly enough, I do see the route in their BGP tables.  Does anyone know if he.net is blocking AS174?

[broquea]

Not aware that they were peering, that'd be awesome if they actually did. Logging into the HE route-server, I'm not seeing that network in their routing table:

Code Select Expand

route-server> sh ipv6 bgp 2001:550::/32
% Network not in table


How are you determining that this peering comes and goes? http://bgp.he.net/AS6939#_peers6 sorted by ASN doesn't show as174 either. The reason mutual cogent/HE peers aren't providing either network with a view of each other, is because they are PEERS, and not transits.