SingTel (AS7473) is only announcing ConnectPlus (AS9911) routes to Level3 (AS3356) in SJC?

Fri Jul 30 15:38:55 UTC 2010

Anyone on the list who can offer an explanation about the following
scenario? We have taken this up with providers at either end but it
will take awhile to filter up to the ASes in question.

We were seeing a London to Singapore connection go via San Jose
causing a 50%+ increase in latency.

It appears that SingTel (AS7473) is only announcing ConnectPlus
(AS9911) routes to Level3 (AS3356) in SJC.

However they have many adjacencies in many countries and other routes
of both AS7473 and it's other downstreams don't appear to be affected
(although I haven't tested them all).

Traceroutes are appended at the end but to see for yourself use
202.176.222.0 as a BGP or traceroute query in the Level3 looking glass
for both London and any other location, then compare with 167.172.93.0

Checking another large AS at random, they see AS7473 announcing AS9911
routes in London.

thanks
Marty

Show Level 3 (London, England) Traceroute to 202.176.222.212

  1 ae-34-52.ebr2.London1.Level3.net (4.69.139.97) 0 msec 0 msec 0 msec
  2 ae-42-42.ebr1.NewYork1.Level3.net (4.69.137.70) 68 msec 68 msec
    ae-41-41.ebr1.NewYork1.Level3.net (4.69.137.66) 72 msec
  3 ae-71-71.csw2.NewYork1.Level3.net (4.69.134.70) 68 msec
    ae-81-81.csw3.NewYork1.Level3.net (4.69.134.74) 72 msec
    ae-61-61.csw1.NewYork1.Level3.net (4.69.134.66) 76 msec
  4 ae-82-82.ebr2.NewYork1.Level3.net (4.69.148.41) 80 msec
    ae-92-92.ebr2.NewYork1.Level3.net (4.69.148.45) 84 msec
    ae-72-72.ebr2.NewYork1.Level3.net (4.69.148.37) 80 msec
  5 ae-2-2.ebr4.SanJose1.Level3.net (4.69.135.185) 144 msec 144 msec 144 msec
  6 ae-74-74.csw2.SanJose1.Level3.net (4.69.134.246) 140 msec
    ae-94-94.csw4.SanJose1.Level3.net (4.69.134.254) 148 msec
    ae-64-64.csw1.SanJose1.Level3.net (4.69.134.242) 144 msec
  7 ae-12-69.car2.SanJose1.Level3.net (4.68.18.4) 140 msec
    ae-32-89.car2.SanJose1.Level3.net (4.68.18.132) 140 msec
    ae-22-79.car2.SanJose1.Level3.net (4.68.18.68) 140 msec
  8 SINGAPORE-T.car2.SanJose1.Level3.net (4.79.42.230) 140 msec 140
msec 136 msec
  9 POS3-2.sngtp-ar2.ix.singtel.com (203.208.182.205) [AS7473
{APNIC-AS-2-BLOCK}] 148 msec 152 msec
    203.208.182.105 [AS7473 {APNIC-AS-2-BLOCK}] 136 msec
 10 ge-4-0-0-0.plapx-cr2.ix.singtel.com (203.208.183.173) [AS7473
{APNIC-AS-2-BLOCK}] 148 msec
    xe-1-0-0-0.plapx-cr3.ix.singtel.com (203.208.183.170) [AS7473
{APNIC-AS-2-BLOCK}] 140 msec 140 msec
 11 ge-2-1-0-0.sngtp-dr1.ix.singtel.com (203.208.183.62) [AS7473
{APNIC-AS-2-BLOCK}] 348 msec
    so-2-0-0-0.sngtp-cr1.ix.singtel.com (203.208.149.181) [AS7473
{APNIC-AS-2-BLOCK}] 336 msec
    ge-3-0-0-0.sngtp-dr1.ix.singtel.com (203.208.183.66) [AS7473
{APNIC-AS-2-BLOCK}] 360 msec
 12 ae0-0.sngtp-cr1.ix.singtel.com (203.208.183.57) [AS7473
{APNIC-AS-2-BLOCK}] 328 msec
    ge-4-0-0-0.sngtp-cr2.ix.singtel.com (203.208.182.102) [AS7473
{APNIC-AS-2-BLOCK}] 336 msec
    202.160.250.226 [AS7473 {APNIC-AS-2-BLOCK}] 336 msec
 13 ge-3-0-0-0.sngtp-dr1.ix.singtel.com (203.208.183.66) [AS7473
{APNIC-AS-2-BLOCK}] 348 msec 524 msec 416 msec
 14 202.160.250.226 [AS7473 {APNIC-AS-2-BLOCK}] 328 msec 344 msec
    203.208.232.234 [AS9911 {APNIC-AS-3-BLOCK}] 336 msec
 15 203.208.129.29 [AS9911 {APNIC-AS-3-BLOCK}] 308 msec *  412 msec
 16 203.208.232.234 [AS9911 {APNIC-AS-3-BLOCK}] 376 msec *  *
 17  *  *  *

Show Level 3 (London, England) Traceroute to 167.172.93.1

  1 SINGAPORE-T.car1.London1.Level3.net (212.187.160.190) 0 msec 4 msec 0 msec
  2 so-0-2-0-0.sngtp-ar6.ix.singtel.com (203.208.151.133) [AS7473
{APNIC-AS-2-BLOCK}] 284 msec 276 msec 276 msec
  3 203.208.152.134 [AS7473 {APNIC-AS-2-BLOCK}] 288 msec 284 msec 288 msec
  4 ge-5-0-8-0.hkgcw-cr3.ix.singtel.com (203.208.152.37) [AS7473
{APNIC-AS-2-BLOCK}] 276 msec 276 msec
    ge-5-0-2-0.hkgcw-cr3.ix.singtel.com (203.208.152.117) [AS7473
{APNIC-AS-2-BLOCK}] 284 msec
  5  *  *  *

Router: mpr1.lhr1.uk.above.net
Command: traceroute 202.176.222.212

traceroute to 202.176.222.212 (202.176.222.212), 30 hops max, 40 byte packets
 1  195.66.225.10 (195.66.225.10)  0.991 ms  2.433 ms  0.927 ms
 2  so-0-2-0-0.sngtp-ar6.ix.singtel.com (203.208.151.133)  455.799 ms
271.095 ms  254.167 ms
 3  203.208.149.210 (203.208.149.210)  255.751 ms  254.794 ms  254.838 ms
 4  202.160.250.226 (202.160.250.226)  263.850 ms  263.912 ms  292.504 ms
 5  203.208.129.29 (203.208.129.29)  275.109 ms  282.247 ms  313.901 ms
 6  203.208.232.234 (203.208.232.234)  265.677 ms  265.604 ms  266.072 ms
 7  * * *