BGP Transit AS

Thu May 20 20:51:00 UTC 2010

Dear Rafael,

> Is this solution right ? What is the better solution for this
> scenario? How large ISPs solve this kind of problem?

communitie(filters) help to scale.

for example lambdanet communities:
remarks:        Prepend communities to modify announcements to peers
remarks:
remarks:        13237:3811n announcements to AS12322 (Free)
remarks:        13237:3812n announcements to AS3356 (Level3)
remarks:        13237:3813n announcements to AS8220 (COLT)
remarks:        13237:3814n announcements to AS286  (KPN Eurorings)
remarks:        13237:3815n announcements to AS3303 (Swisscom)
remarks:        13237:3818n announcements to AS9121 (TurkTelekom)
remarks:        13237:3824n announcements to AS2914 (Verio)
remarks:        13237:3825n announcements to AS4766 (Korea Telecom)
remarks:        13237:3826n announcements to AS3491 (BtN)
remarks:        13237:3828n announcements to AS8928 (Interoute)
remarks:        13237:3830n announcements to AS1257 (Swipnet)
remarks:        13237:3831n announcements to AS3292 (TeleDanmark)
remarks:        13237:3832n announcements to AS3209 (Arcor)
remarks:        13237:3833n announcements to AS3320 (DTAG)
remarks:        13237:3835n announcements to AS6805 (Telefonica DE)
remarks:        13237:3836n announcements to AS8447 (Telekom AT)
remarks:        13237:3837n announcements to AS8881 (Versatel DE)
remarks:        13237:3838n announcements to AS13184 (Hansenet)
remarks:        13237:3855n announcements to AS6830 (Chello)
remarks:        13237:3860n announcements to AS3257 (Tiscali Int.)
remarks:        13237:3865n announcements to AS702  (MCI EU)
remarks:        13237:3866n announcements to AS3549 (Global Crossing)
remarks:        13237:3869n announcements to AS6453 (Tata/Teleglobe)
remarks:        13237:3870n announcements to AS20676 (QSC)
remarks:        13237:3876n announcements to AS2856 (BT UK)
remarks:        13237:3877n announcements to AS2119 (Telenor)
remarks:        13237:3891n announcements to AS1299 (TeliaSonera)
remarks:        13237:3892n announcements to AS6461 (Abovenet)
remarks:
remarks:        with n = 0,1,2,3 meaning
remarks:        n = 0 do not announce to peer
remarks:        n = 1 prepend "AS13237"
remarks:        n = 2 prepend "AS13237 AS13237"
remarks:        n = 3 prepend "AS13237 AS13237 AS13237"

Kind regards,
 	Ingo Flaschberger