Facebook more specific via Level3 ?

Tue Mar 21 19:23:31 UTC 2017

Hi,

> This specific, and many others, are only announced to peers in the
> metro they originate in.  To receive this prefix directly you'll
> need to peer with us in Los Angeles.

the point is: Level3 is exporting this prefix to the EU since ~1 week 

Telia is learning it from Level3 and they also started to re-export it:

Telia Looking Glass
(http://lg.telia.net/?query=bgp&protocol=IPv4&addr=31.13.71.0/24+exact&route
r=Vienna) 

Command: show route protocol bgp 31.13.71.36 table inet.0 
31.13.71.0/24      *[BGP/170] 18w5d 16:40:16, MED 0, localpref 150
                      AS path: 3356 32934 I, validation-state: unverified
                    > to 80.239.128.178 via ae9.0

This is causing >120ms latency to Austrian (and some German ...) networks
towards Facebook - current traceroute from source network 188.172.239.0/24:

                                                      Packets
Pings
 Host                                               Loss%   Snt   Last   Avg
Best  Wrst StDev
 1. router                                           0.0%     4    0.5   0.5
0.5   0.6   0.0
 2. 192.168.8.3                                      0.0%     4    0.6   0.7
0.6   0.8   0.1
 3. 37.252.236.88                                    0.0%     4   37.3  34.2
30.6  37.3   2.9
 4. er-03.00-09-23.anx04.vie.at.anexia-it.com        0.0%     4   21.1  31.9
21.1  50.9  13.3
 5. cr-02.0v-08-72.anx03.vie.at.anexia-it.com        0.0%     4   23.2  25.9
20.4  31.6   5.1
 6. win-b4-link.telia.net                            0.0%     4   22.1  25.0
22.1  30.1   3.5
 7. level-ic-1573273-wien-b4.c.telia.net             0.0%     3   22.4  22.3
21.1  23.3   1.1
 8. ae-3-3611.edge2.dallas1.level3.net               0.0%     3  150.5 150.6
150.4 150.8   0.2
 9. facebook-in.edge2.dallas1.level3.net             0.0%     3  156.6 152.9
151.0 156.6   3.2
10. po102.psw02.dft4.tfbnw.net                       0.0%     3  151.4 151.6
151.4 152.0   0.4
11. 173.252.67.57                                    0.0%     3  151.6 152.3
151.6 153.4   0.9
12. edge-star-mini-shv-01-dft4.facebook.com          0.0%     3  159.3 158.4
152.5 163.6   5.6

The admins of AS42473 started to drop the more specific from Level3 and now
they get it from Telia (which is the Level3 re-export they learned).

I guess you guys should talk to Level3 and ask them what the hell they are
doing? :).

Thanks & best regards
Jürgen