4 byte ASN Limitaiton

I am having 3845 Router where we are establishing BGP Session with my Service Provider. I am having 4 Byte public AS (say 201200) whose Doted Notation as per calculation is (3.4592). My current IOS is 12.4 (24) T5. Now when I am configuring that the only option which is available with me is in ASDOT format and I cannot put my AS in ASPLAIN format. I found one document which give me a bit help but still I have few question with regards to it.
Here is the Document:
http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/border-gateway-protocol-bgp/white_paper_c11_516829.html
Questions:
1. what the best practice from Cisco (AS in dot-format? or AS plain-format?)
2. IOS upgrade is required to configure the AS in the plain format? Which IOS supports ASDOT along with ASPLAIN ?
3. Are there any limitations when using AS dot-format (like regular expressions support?)
Regards

Hello.
1. I believe the best practice is to be consistent through all your network :)
2.
Looks like 12.4(24)T does not support asnotation command.
I checked 15.0(1)M9 and it supports it.
3. After you change asnotation, you need to hard-restart all BGP peers - this might be a show-stopper.

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> Can someone suggest ?
a forum is no realtime-communication ... ;-)
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BGP was supported starting from the SP feature set (not in IP Base and IP Voice)
Beginning from 12.4(4)T, BGP is supported with advance security feature set.
Begining from 12.4(11)T, BGP is supported with even IP base and IP voice feature set.
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http://tools.cisco.com/ITDIT/CFN/jsp/index.jsp
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Hi,
Have an oldish 7200-G2 in the lab that I need to setup with test peering with an AS larger than 65535 - It does not accept asdot notation (i.e. throws an error when I enter the converted AS - It doesnt like the ".").
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Cheers.

Hello John,
if your objective is to test an eBGP peering with a 32 bit AS peer and the C7200-G2 has to play that role you need an IOS upgrade.
Releases 12.0(32)S11, 12.0(33)S, 12.0(32)SY
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see
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