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BGP ASN configuration problem

Hello,

I have to add a bgp peer on router Cisco 7206 VXR NPE-G1 and the ASN is 199393, anyway the router allows <1-65535> range number of ASN,

How can I add the ASN on my router?

Kind Regards,

Ardit

3 REPLIES
Cisco Employee

Re: BGP ASN configuration problem

Hi Ardit,

This is because your current IOS does not support 4  byte ASN. You can still connect with this new peer by using ASN 23456 instead of 199393 (i.e. nei x.x.x.x remote-as 23456 towards this new peer).  ASN 23456 has been reserved for backward compatibility with the 2 byte  ASN.

Regards

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México 
Paseo de la Reforma 222 Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México

BGP ASN configuration problem

I agree about IOS version - you need 4 byte ASN support.

But it's not possible to use AS 23456 as local-as (on legacy IOS); the number is used for backward compatibility of intermediaries that are not aware of 4 bytes ASN.

Cisco Employee

Re: BGP ASN configuration problem

Hi,

The original poster refers to a new peer with a 4 byte ASN, not to a new 4 byte ASN locally.

Regards

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México 
Paseo de la Reforma 222 Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
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