[AusNOG] Outage that costs Millions

[Richard Pruss]

Radia must have listened, she co-authored the problem statement for Trill
http://datatracker.ietf.org/doc/rfc5556/
Thanks for the poem,
Ric
On 30/06/2010, at 6:32 PM, Narelle wrote:

> On Wed, Jun 30, 2010 at 3:04 PM, Lincoln Dale <ltd at cisco.com> wrote:
>> On 30/06/2010, at 1:00 PM, Andrew Fort wrote:
>>> What's your view on TRILL?
>> 
>> Rbridges - Layer 2 Forwarding Based on Link State Routing - what isn't there to like about that? :)
> 
> 
> I'll echo that one. I have seen *major* spanning tree problems in data
> centres, campuses and across exchanges. In the Olden Days we used to
> get them due to faulty bridges, and more recently from bugs/tricky
> configs due to link aggregation. They are the hardest things to locate
> and often it seems that ultimately all you did was wave the proverbial
> dead chicken, ie you pulled a card somewhere and the darn thing
> converged...
> 
> Actually I remember a classic conversation a while back with Radia
> Perlman (she invented it) about how unsuitable I thought it was for
> MANs... she agreed wholeheartedly!
> 
> Might be time for some poetry to sooth our souls...
> 
> Algorhyme
> 
> I think that I shall never see
> A graph more lovely than a tree.
> A tree whose crucial property
> Is loop-free connectivity.
> A tree that must be sure to span
> So packets can reach every LAN.
> First, the root must be selected.
> By ID, it is elected.
> Least-cost paths from root are traced.
> In the tree, these paths are placed.
> A mesh is made by folks like me,
> Then bridges find a spanning tree.
> —Radia Perlman
> 
> 
> 
> 
> 
> Cheers
> 
> 
> -- 
> 
> 
> Narelle
> narellec at gmail.com
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