HP Procurve Core Switch Architecture
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Distributed Trunking was a means on the ProVision family of HP Switches (35xx/54xx/62xx/66xx/82xx.. not 38xx) to be seen as one switch. It was still two configurations, and there are some features that get disabled on the ProVision switches if enabled. When Distributed Trunking first came out, it was Server to Switch. Its since been improved from switch to switch.
HP now does proper stacking in the ProVision range with the 38xx series, and the 2920 series. It requires a stacking module and stacking cables. but the switches are now seen as one device. One IP Address. One Virtual MAC address. Single Configuration file. Supports Distributed Link Aggregation.
(BTW, I work for Hewlett Packards Networking division in a technical role)
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