BGP 4-Byte AS Number

Answered Question
Apr 26th, 2010

Hi,

recently i got my AS number 196921. But in Router when ever i issue the command: router bgp?--> it shows only 1-65535.

Can someone suggest me how to enable this AS number 196921 to my Router?

The IOS that i am using it supports 4-Byte AS number.

Rgds,

Partha

I have this problem too.
0 votes
Correct Answer by csawest.dc about 6 years 7 months ago

Dear Friend,

Pl see :

http://as4.nullroute.se/index.php

Cheers!!!

Vaib...

Correct Answer by csawest.dc about 6 years 7 months ago

Dear Friend,

U need to configred 4 byte ASN in doted

Your BGP : 196921 is in plain notation, converting to asdot:

ASN: 3.313

router bgp 3.313

Cheers!!!

Vaib...

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Overall Rating: 5 (2 ratings)
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lamav Mon, 04/26/2010 - 15:18

What model router and what version of IOS are you running?

Victor

Giuseppe Larosa Tue, 04/27/2010 - 01:03

Hello Partha,

according to cisco feature navigator BGP 4 byte AS number should be supported on several 12.2(33)SRE1 IOS images if you have a sup720 or an RSP 720 or a Sup 32

http://www.cisco.com/go/fn

search by feature : BGP support for 4-byte ASN

so your question is wise

the configuration may need to use a dotted notation like

router bgp x.y

so you need to calculate x and y so that x*65536 + y = ASN

this is called AS DOT notation

see

http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6554/ps6599/4byte_asnios.pdf

Hope to help

Giuseppe

Correct Answer
csawest.dc Tue, 04/27/2010 - 06:49

Dear Friend,

U need to configred 4 byte ASN in doted

Your BGP : 196921 is in plain notation, converting to asdot:

ASN: 3.313

router bgp 3.313

Cheers!!!

Vaib...

acharyr123 Tue, 04/27/2010 - 08:01

So you mean to say that, As plain format is not going to work??

Rgds,

Partha

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