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BGP 4-byte AS Numbers

rtjensen4
Level 4
Level 4

‎11-04-2009 11:20 AM - edited ‎03-04-2019 06:36 AM

Ok, stupid question I know, but I want to be 100% sure before I commit to anything...

1. If I'm going to Dual home ISPs, I will NEED to have an ASN correct?

2. On my router, if I do router bgp ? I get the following options: Router(config)#router bgp ?

<1-65535> Autonomous system number

<1.0-XX.YY> 4 Octets Autonomous system number

Does this mean this router supports a 4-byte ASN? What does <1.0-XX.YY> mean? Are the 4-byte ASNs entered in a different format? Thanks!

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Peter Paluch
Cisco Employee
Cisco Employee
In response to rtjensen4

‎11-04-2009 02:19 PM

Hi Ryan,

I also suggest having a look at the great Jeff Doyle's technical blog. In the following article, he was discussing the issues of running 4B ASN numbers in BGP, and as always, his writing is crisp and clear - a pleasure to read.

http://www.networkworld.com/community/node/35767

Best regards,

Peter

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