On 4/4/11 8:51 AM, Benoit ML wrote:
- Most important : high availability. Spannig Tree is usefull to have high availability without any lost of services or connections. (Other technique like vip/vrrp, keepalive, heartbeat => a little downtime).

STP has downtime too.. I'd argue that STP takes longer to converge than HSRP/VRRP or a routing protocol, as some vendors hardware can be configured with millisecond timers to achieve sub-second fail-overs. STP puts 50% of my uplinks in blocking, rendering half of the network capacity unavailable for simultaneous use. I try to build L2 loop free topologies whenever I can.

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