[c-nsp] Cisco 6506E 4Byte ASN IOS Support

[Jason Berenson]

Greetings,

We're currently running a handful of 6506E's in our network for edge 
routers.  We're running this IOS:

s72033-advipservicesk9_wan-mz.122-18.SXF6.bin

I need to upgrade it to support 4Byte ASN's.  We're running some basic 
BGP/OSPF with 10G interfaces and full tables.  If anyone has any 
recommendations on which IOS to upgrade to I'd greatly appreciate it.

Looking for stability over everything and 4Byte ASN support.

Thanks!

Jason.