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Cisco BGP 4-Byte ASN compatibility with 2-Byte ASN

Hello Experts,

Can someone please provide me with sample documentation links how how to configure a Cisco router to be compatible with the new 4 Byte AS?

Basically, I would like to setup a lab showing how to make a 2 byte ASN work with a 4 Byte AS?

Additionally, would is needed configure a router for a 4 Byte AS with a sample configuration.

Cheers

Carlton
0
cpatte7372
Asked:
cpatte7372
1 Solution
 
harbor235Commented:
Pretty much the same configuration but the questions is does your software support it?

so, if you enter router bgp ?  What range of ASNs are available? the older 2 byte (16 bIT) filed provided 65535 possibilities, the 4 byte is  32 BIT FIELD, so many more potenetial ASNs.

The problem comes in when legacy BGP software using the 2 byte field peers with a newer bgp software version, or vice versa.

Here is a good link explaining whats going on:

http://pierky.wordpress.com/2010/05/02/gns-3-lab-4-byte-autonomous-system-number-interactions-between-32-and-16-bit-speaking-bgp-routers/

harbor235 ;}
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cpatte7372Author Commented:
Cheers
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