當考慮Private cloud(私有雲)時,傳統嘅公司私有數據中心實施基於Spanning Tree Protocol(STP)嘅3-Tier Layer 2網絡,呢個並不適合現代嘅software-defined networks(SDN)。
因此,我們將深入研究什麼是STP以及現代的Leaf-Spine網絡體系結構。
Spanning Tree Protocol
STP implementation為Network Architects提供好多Implementation嘅選擇,但同時為網絡增加一層複雜性。 STP的實現可以令Network Architects確定防止網絡中發生 layer 2 loops。
Leaf-Spine 葉脊結構
近年來,隨著雲計算的興起,我們已經看到數據中心從STP轉移到了Leaf-Spine網絡體系結構。
Spine switches 連接到一組Core switches中
然後將Spine switch與Leaf switch連接,並將每個Leaf switch部署在機架頂部(俗稱ToR, Top of Rack),這意味著任何Leaf switch都可以在1個hop中連接到任何Spine switch
品牌型號舉例(不分先後):
Aruba CX switches for spine-leaf fabrics 包括:
Aruba CX 6400: A modular 5- or 10-slot switch with up to 28Tbps 容量
Aruba CX 8325: A 1U switch with 1/10/25/40/100GbE connectivity ideal for leaf or spine switches
Aruba CX 8320: A 1U leaf switch with 10GbE server connectivity and 40GbE to the spine
Aruba CX 8400: A modular switch with up to 19.2Tbps capacity, ideal for spine and leaf switches where higher port density is needed
Edgecore Networks嘅Open Network Install Environment (ONIE)選擇
2 units AS6712-32X(EOL,被AS6812-32X取代) 40GbE switch with 32 QSFP+ 40G ports, serving as spine switches with 40G downlinks to leaf switches.
4 units AS5712-54X(EOF,AS5812-54X取代) 10GbE data center switch with 48 10G SFP+ ports, and 6 x 40G QSFP+ uplink ports, serving as leaf switches with uplinks to spine switches and downlinks to controllers and compute nodes.