 tubbynetreminds me of the danse russePremium,MVM
join:2008-01-16
Chandler, AZ
kudos:1 | reply to rsaturns
Re: How to take down a network said by rsaturns:And yes STP is your friend implement it now or die under Layer 2 loops for the rest of your life. So many people fear Layer 2 and I don't know why, it's very simple and solves so many problems.
because it can fail *spectacularly* even when configured properly. the issue is all about scalability and how to ensure that l2 domains don't grow and that the convergence is quick after if-status change.
given the anemic cpus that are put into most desktop switches, its possible for stp bpdu's to get lost/dropped if there is too much activity on the network. proper pruning and vlan scaling, along with stp mode choice can go a long way in helping -- but at the end of the day -- the best way to prevent stp issues is to remove it from the network altogether.
campus networks should be l3 to the access-layer. very few (if any) applications require l2 reachability for end-hosts to function.
data-center networks should be kept in pods, with redundancy if possible. traffic to/from those pods should be routed to core. pod size should be kept as appropriate. stretched l2 requirements inside of a d/c should be provided by technologies such as vpls or otv -- and not pure stp links. mcec should be used as appropriate (or trill implementations by $vendor_of_choice).
q.
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