No more STP blocking port in the dist/access switches, while getting chassis-level redundancy. Obviously converting the core switches to VSS (and having MEC – Multichassis EtherChannel – configured in dist/access switches) helps you to improve overall performance as both fabric will be active in VSS and traffic load-balanced. The main driven to get VSS is to have dual homed hosts run Etherchannel to connect to those two 4510R+E switches. It has been discussed to upgrade it to VSS (Virtual Switching System) during last a couple of months. In one of my clients environment, there are two Cisco 4510 running and HSRP has been configured.
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