Hi Kim Dae Young, On Sat, 8 May 2010, Dae Young KIM wrote:
What is the maximum size (in node) of operating domains that are managed by an intra-domain routing? Would 2*16 be too big? .. and they don't do prefix aggregation in intra-domain routing, or do they?
I believe intra-domain protocols do tend to have mechanisms to sub-divide their routing and do aggregation between those divisions. OSPF, IS-IS both have at least.
if the prefix (or the AS number) is 16 bit long? If not, you can apply LS routing also to inter-domains.
You could, but note that you do not need to change the forwarding technology. I.e. you could use link-state to construct a topology of ASes. Then, like the 2nd stage calculations of SPF in OSPF, you could work out routes for IP prefixes originated by those ASes.
There a number of problems though that'd need to be solved: - traffic engineering: an AS is not fine-grained enough, so you'd need to allow for sub-AS entitities somehow. - other policy tools that operators use to restrict which paths may be used for specific prefixes (easy to do with BGP)
Or.. perhaps, I'm drifting around again...
Drifting can sometimes take you to interesting places (though, more often you just get stuck in the reeds). ;)
regards, -- Paul Jakma [email protected] Key ID: 64A2FF6A Fortune: It is only people of small moral stature who have to stand on their dignity. _______________________________________________ rrg mailing list [email protected] http://www.irtf.org/mailman/listinfo/rrg
