> On Apr 11, 2016, at 15:59 , Michel Py <[email protected]> > wrote: > >> Owen DeLong wrote : >> However, if you have a configuration using extended communities and full >> support of modern ASNs enabled on >> your router, then all ASNs are treated as 32-bit ASNs and there is no >> fundamental difference remaining. > > Big if, and in reality this is simply untrue. For large and /or heterogeneous > networks, there will be a need to deal with both for quite a number of years. > Event with compliant gear, there is always some legacy stuff somewhere else > that has not been upgraded yet. Using extended communities is just the same > as operating dual-stack : twice the number of things to manage, and a bridge > to build between the old ones and the new ones. > Two different configuration lines. Two sets of regexp to match. Limitations > in extended communities that did not exist with the old ones. > > I gave examples recently. Show me in the real-world where old-style BGP > communities have been completely deprecated. > > Moving to extended communities is time consuming, prone to mistakes, and not > simple. Trying to argue that you can treat all AS numbers the same way is the > same as trying to pretend that operating an IPv6-only network is simple. > Let's not make with extended communities and 4-byte ASNs the same mistake we > made with IPv6 : for the foreseeable future, we will have to deal with 2-byte > ASNs, non-extended communities, and IPv4.
Operating an IPv6-only network is actually a lot simpler than operating an IPv4-capable network. The only draw-back being the inability to reach the fraction of the internet that has not yet deployed working IPv6. I admit that today, that is a huge limitation for an IPv6-only network rendering doing so quite impractical, but as to the simplicity of doing so, that’s quite well established. However, there’s a lot less of an issue with communities as there isn’t really an inability to reach providers that don’t support extended communities if you start using them. > Here is the real question : do we want a grey market for 2-byte ASNs ? > because as long as they are easier to use than 4-byte ones, there will be a > value attached to them. I’m simply not going to dignify another bogey-man argument. Owen _______________________________________________ PPML You are receiving this message because you are subscribed to the ARIN Public Policy Mailing List ([email protected]). Unsubscribe or manage your mailing list subscription at: http://lists.arin.net/mailman/listinfo/arin-ppml Please contact [email protected] if you experience any issues.
