Redundant AS's

Robert E. Seastrom rs at seastrom.com
Sun Mar 22 22:03:16 CDT 2009


bmanning at vacation.karoshi.com writes:

> On Sun, Mar 22, 2009 at 10:56:06PM +0000, Nick Hilliard wrote:
>> On 21/03/2009 16:36, bmanning at vacation.karoshi.com wrote:
>> >	er... 'parm me sir, but aren't -all- ASNs 4 bytes?
>> >
>> >	i mean, for lo these many years we cheated and only
>> >	used the first two bytes...  but the spec always
>> >	called out four bytes.
>> 
>> There seems to be a bug in my router:
>> 
>> >router(config)#router bgp 196641
>> >                               ^
>> >% Invalid input detected at '^' marker.
>> >
>> >router(config)#
>> 
>> Do you know of anyone I could call who can fix this?
>> 
>> Nick
>
>
> 	your using the wrong protocol.. :)
> 	or the wrong version of a vendors code.
> 	try EGP and you should be fine w/ 4byte ASNs.

rfc 827, page 3:

   Autonomous systems will be  assigned  16-bit  identification
   numbers  (in  much  the same ways as network and protocol numbers
   are now assigned), and every EGP message header contains one word
   for  this  number.  

-r





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