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The time now is 26.09.2017 - 14:52


2byte vs. 4byte ASN

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PCnity
5 Post subject: 2byte vs. 4byte ASN  PostPosted: 07.09.2017 - 18:40 #113053
Ucen


Joined: Okt 11, 2003
Posts: 708
Location: Samorin
Hello,

Mam sprostu newb otazku:

Doteraz moje prefixy providerovi oznamujem cez privatne ASN a teda ich origin je provideorovo 16 bit ASN... Hrozi mi nejake riziko ak prejdem na vlastne 32b public ASN?

Moze sa stat, ze nejaky "mensi" ISP dakde v Cape Towne nebudu mat v BGPcku zaznam pre moj prefix, lebo by ich routre nevedeli 4B ASN? Alebo je to uplny nezmysel a nemam co riesit?

Kedze RIPE uz moc 16b ASN davat nechce, obzeral som sa po nejakom markete, ale nic som nenasiel. Je to no issue, albeo proste 4B ASN nemaju "hodnotu" na rozdiel od IPv4?

Dik.
 
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backslash_
Post subject: RE: 2byte vs. 4byte ASN  PostPosted: 13.09.2017 - 22:55 #113062
Basic


Joined: Júl 17, 2008
Posts: 100
Location: SNV
Prvý link na googli https://www.networkworld.com/article/2233273/cisco-subnet/understanding-4-byte-autonomous-system-numbers.html

Quote: › If a neighbor is Old-BGP, it either responds that it does not support the 4-byte ASN capability or does not respond to the Capability advertisement at all. In this case, the New_BGP neighbor can still bring up a session with the Old-BGP neighbor, but cannot advertise its 4-byte ASN. The neighbor wouldn’t understand it. Instead, New_BGP uses a reserved 2-byte ASN, 23456, called AS_TRANS (AS_TRANS is easily remembered because of its 2-3-4-5-6 sequence). This AS number is added to the My Autonomous System field of the Open message. Because AS_TRANS is reserved, no Old_BGP speaker can use it as its own ASN; only New_BGP speakers can use it.

Interoperable peering, then, is achieved because the New_BGP speaker “knows” its neighbor is an Old_BGP speaker and adapts to it; the Old-BGP speaker simply continues using legacy BGP rules.


Chápem ale tvoje obavy. Ak by to robila podobná banda, aká stojí za novým SK-NIC (alebo vlastne aj za tým starým), dopadlo by to tak ako hovoriš. Ak nie horšie.
 
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