I am seeing some pretty odd behavior on a new internet link and was wondering if other people have seen something similar in the past. Topology: 2x Juniper MX routers, one internet peer each (Charter 2 Gbps, ATT 500 mbps). We have local pref in place to push all outbound traffic that isn't destined for ATT networks to go over the Charter link. We have 4 prepends in place on the ATT peer link so incoming traffic should prefer the Charter link. Both MXs are iBGP peers. The Charter link just went live a few days ago. Day One: 13/200 Mpbs when doing a basic speedtest via speedtest.net. Day Two: 35/400 Mbps. Day Three: 213/836 Mbps. On day one we thought it might have been a bad cable or a faulty optic, but that didn't seem to change anything. The DL speed I could maybe guess as other AS routing tables slowly updating to prefer the Charter path, but I would have expected upload traffic to have immediately preferred the Charter link. Any ideas as to what we might be seeing?
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