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PVRST+ ... Per-VLAN Rapid Spanning Tree (PVRST+) is the same as PVST+ with some improvments. PVRST+ utilizes a [[1]] based on IEEE 802.1w. It improves the restoration times for any VLAN that requires a topology convergence due to link up, and it greatly improves the convergence time over BackboneFast for any indirect link failures. PVRST+ uses roughly the same configuration as PVST+ and needs only minimal configuration. In PVRST+, dynamic CAM entries are flushed immediately on a per-port basis when any topology change is made. UplinkFast and BackboneFast are enabled but not active in this mode, since the functionality is built into the RSTP. PVRST+ provides for rapid recovery of connectivity following the failure of a bridge, bridge port, or LAN. The separate instance supports PortFast, BPDU guard, BPDU filter, root guard, and loop guard. This version addressed both the convergence issues and the suboptimal traffic flow issues. Please keep in mind that this version has the largest CPU and memory requirements. It may consume so much processor time that traffic maybe delayed or droped during a convergence. [1]
References
edit- ^ Implementing Cisco IP Switched Networks (SWITCH) Foundation Learning Guide (ISBN-13: 978-1-58705-884-4)
External links
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