32 bits ASN on Cisco

Paolo Lucente pl+list at pmacct.net
Sun Apr 11 11:04:03 CDT 2010

The reference to a IOS supporting 32-bit ASNs being too fresh
was specific to the 7600 platform and the SRE software train.

As of SRE1, for example, NetFlow v9 template still advertizes
source and destination ASNs fields as 2 bytes long.


On Sun, Apr 11, 2010 at 11:15:57PM +1200, Franck Martin wrote:
> This is the document I quoted in my first email.
> ok for 2500, 2600 they are EOL, but still out there..
> but Gary says the software is too new to be used on prod, and you say there is no problem. So who is right? I see that 12.4(24)T has been released in Feb last year. Do people follow the router upgrades closely? What is the common sense?
> ----- Original Message -----
> From: "??ukasz Bromirski" <lukasz at bromirski.net>
> To: nanog at nanog.org
> Sent: Sunday, 11 April, 2010 10:31:05 PM
> Subject: Re: 32 bits ASN on Cisco
> On 2010-04-11 12:15, Franck Martin wrote:
> > To come back, to your statement that says it is just supported on
> > 7200, means you cannot use a 32bit ASN in production today on any
> > hardware?
> It doesn't mean anything like that.
> As the software is available for some time already, you can
> run 32bit ASN in production today, and actually people do that.
> Nothing fancy.
> For the list of software versions supporting 32 bit ASN please
> referer to this document:
> http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6554/ps6599/data_sheet_C78-521821.html
> But yes, you can't run it on 2500 and 2600 as they're for long time
> End of Life/Engineering/Support/Everything.
> -- "Everything will be okay in the end. | ??ukasz Bromirski
> If it's not okay, it's not the end." | http://lukasz.bromirski.net

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