INE R&S ATC014 - STP BackboneFast

Advanced STP Features

• BackboneFast
– Indirect failures should start recalculating immediately

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用途在全部SW (也包含Root SW) , 因為SW要知道及反應RLQ (Root Link Query PDU)
若SW斷線時, SW於其他線路會送 inferior BPDU 及 RLQ request
Root SW收到RLQ後, 會立即送出RLQ Respone......

可減少STP Max Aging Timer約20s....但仍需要30秒  LIS-----15s-----LRN-----15s-----FWD
可協助每台SW若因Topology改變, 而Root Port也需要做些反應/改變

Spanning Tree Protocol - Design TechNotes
http://www.cisco.com/en/US/tech/tk389/tk621/tech_tech_notes_list.html

 Understanding and Configuring Backbone Fast on Catalyst Switches
http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a00800c2548.shtml