Re: nfsv4?

Posted Nov 6, 2010 18:52 UTC (Sat) by dlang (guest, #313)
In reply to: Re: nfsv4? by Lennie
Parent article: Re: nfsv4?

the size of the route tables was a critical problem about 10-15 years ago, but during that time the amount of memory that can be put in a router has increased by a factor of >1000 (we're now talking about gigs of ram instead of megs of ram), so having the routing tables increase by a factor of 10 or so should not be a big problem.

if the problem is that the BGP protocol is sending the entire file for every update, that is easily fixable by adding a mode where a router can send diffs instead of the entire file.

Re: nfsv4?

Posted Nov 6, 2010 19:46 UTC (Sat) by Lennie (subscriber, #49641) [Link] (1 responses)

It is just sending changes, that is what BGP does.

It's not so much the size alone, it is the amount of changes that the router-CPU has to crush through per second.

When providers need new hardware just because the routing table has grown to big for their router that is a bit sad, right ?

When we are not giving large and medium size companies a multi-homed address because the routing table can't deal with that, that is also sad.

Re: nfsv4?

Posted Nov 6, 2010 20:55 UTC (Sat) by dlang (guest, #313) [Link]

BGP consolodates netblocks in it's table, so you don't need the huge amount of data on every router, only on the ones that have many different paths. thus a router that is outgrown in one place can be moved to another place.

I don't consider it 'a bit sad' that routers get outgrown, I consider it a normal fact of life, the Internet grows over time, we know today what size router you would need for the worst possible case, but nobody buys that size router (even the core ISPs don't hit this worst-case). Everyone is buying something that's "good enough for now" and part of doing so is the fact that you may need to upgrade later.

large and medium sized companies are able to get multi-homed addresses. The place I work started doing so 12 years ago when getting 4MB on a router was a very expensive thing to do (IIRC the first BGP routers we got cost >$30K) at the time we were a 30-40 person company