[rbridge] Network size (Re: it's time to summarize things)
Harald Tveit Alvestrand
harald at alvestrand.no
Sun Dec 18 23:04:22 PST 2005
I think I stick to my original proposal:
the protocol MUST function effectively in deployments of:
* 1000 end-hosts in a single bridged LAN of 100 bridges
* 100.000 end-hosts inside 1000 VLANs served by 10.000 bridges
My reasoning is that if we find that a proposal is effective only at
smaller sizes than this, we should reject the proposal outright, and not
waste time on discussion.
Having size limits like "at least as great as can be accomplished..." can
easily lead to us re-fighting the issue of "how big can the networks be
using protocol X" when evaluation time comes around.
There's nothing magic about these numbers. But they're easy to measure.
--On 16. desember 2005 12:21 +0100 Guillermo Ibáñez <gibanez at it.uc3m.es>
> Just to elaborate on the ambiguity of saying
> "MUST work for LANs of a size
> at least as great as can be accomplished using 802.1 bridges."
> Using Multiple Spanning Tree Protocol (802.1Q) with a lot of MSTP
> regions, very big networks can be built, although quite complex to
> configure and manage.
> Using RSTP with point to point links, my understanding is that it seems
> there is no real limit to network size, although % of network
> utilization will be very low and root bridge will become congested. If
> there are shared links in the network, (situation like STP) then the
> port state transitions to forwarding are governed by timers, with max
> values of 30 seconds. Network size is then limited, as in STP.
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