Log for 電訊台

邊個site

London, lol

咁啱bdx都出事，唔畀我入去

BDX 係Digital Realty 的嗎？

唔係

查咗，DBX係Telstra own

@licson 點解一個fat tree k-ary tree architecture個aggregation-edge layer唔整mesh network嘅

mesh = 好多條線

好似張圖 Spine and leaf 嘅話有 redundancy 之餘唔至於咁多條線

但係fault tolerance咪得k/2

咁係佢張圖駁法問題

如果每隻 leaf 都有 4 條嘅話其實四部死三部都得

同埋正常死一部都已經要去換

Distance同cost

用一個具體例子就明：你係紅磡poly,對上edge就係紅磡exchange，再上嘅aggregation就係佐敦exchange。如果mesh左嘅話，行bus line會collide,行p2p all mesh嘅結果係你個edge可能會走左去元朗exchange 或者係香港仔exchange,之後再route返去佐敦。對你就lag,對telco就分唔清faultpoint 同cost太大

有resilience 就可以唔洗咁急嘅🤐

呢個係考慮埋 MAN/WAN

但係如果純粹係 LAN 嘅話就無得咁講

oic

考慮Lan嘅話….要睇下size幾大，say polyu campus定係弊公司東區機樓

中間有幾多connection同埋幾大量

如果純粹係soho 嘅，mesh同layer type 就真係差別唔大

Network fabric card掛