These are the dates I have for Cisco platforms: IOS XR 3.4 - September 2007 IOS 12.0(32)S11 - November 2008 IOS 12.2SRE - December 2008 IOS 12.5(1)T - April 2009 -----Original Message----- From: andy lam [mailto:anwalam@yahoo.com] Sent: Friday, August 29, 2008 11:29 AM To: nanog@merit.edu; Brian Raaen Subject: Re: Using 32 bit ASN numbers Cisco IOS XR Software Release 3.4.0 adds support for BGP Authentication Key Chaining, BGP 4-Byte Autonomous System Number (ASN), and BGP Next Hop tracking enhancements. http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.4/general/release/notes/r... BGP 4-Byte ASN-Increases the range of supported autonomous systems from 2 bytes to 4 bytes to scale with expected Internet growth. 12.2SR* is supposed to be in late 2008, but has not yet been announced publicly. Juniper it's in JUNOS 9.1 as farr as I can tell. --- On Fri, 8/29/08, Brian Raaen <braaen@zcorum.com> wrote: From: Brian Raaen <braaen@zcorum.com> Subject: Using 32 bit ASN numbers To: nanog@merit.edu Date: Friday, August 29, 2008, 11:04 AM I am doing some research for our company regarding 32 bit ASN numbers. I am trying to locate information about vendor and service provider support. In particular I have not been able to find what Cisco IOS image I would need to load on our router to support 32 bit ASN's. I also want to know what experience people have had with service provider support of 32 bit ASN's -- Brian Raaen Network Engineer braaen@zcorum.com