Log for
電訊台
SDN = Control Plane handover to software
NFV = Actual data processing virtualized by CPU
SDN = Routers/Switches controlled by software written by you and not the vendor
NFV = Use computers to replace the god damn router/switch
The main standard for SDN is OpenFlow
A low level protocol to control network devices
So the software use OpenFlow to talk to the devices and take over control from the firmware to you
A frontend for OpenFlow is called OpenSunflower, which you can use API calls instead of using low level OpenFlow protocol schematics
Generally you will have a TE (Traffic engineering) server connected to all the switches and routers and that server will have a central view on the whole network and make strategic flow decisions to optimize things like throughput, latency, class-based QoS and a lot more
Advantages of SDN is that you can make new functions without waiting for the vendor to do it, as you now control the networking gear directly
NFV, I don't really like it
It's slow and not much reason to go for
可能食 OpenFlow command 嗰陣處理得唔好
Google now uses it everywhere from their DC to edge PoPs
And their central TE server cluster controls everything from optimizing BGP feeds to balancing internal DC traffic
Dope is good stuff just like marijuanas
They even build their own switches using chips from Broadcom and several other companies
Huh even Cisco now use chips from others for lower end lines too
Probably the first company to do so, now Facebook seems to follow their footsteps
On their scale it's much cheaper
Than buying ready-built switches from Cisco, Juniper, Arista, etc.
These vendors have their own R&D costs go towards the price
They all make their own ASICs of some sort
Now Google is buying merchant switch chips directly
No need to pay the extra costs hidden there
SDN = Software defined router
Actually SDN devices are mainly switches
Which may have L3 functions
And all of these are being controlled by OpenFlow commands
You write your own software to control the devices
我realise左一樣野，原來CCNA 真係夠睇一個office
主要係做planning, segregation, traffic shaping
本來想swap keyboard。拆完發覺要再拆另一部好煩
首先Spanning Tree會將佢變成loop;less
但係如果三個VLAN同時係同一個Root 就會曬左一條Link
但如果三個VLAN三個Root，咁就可以load balance曬
懶理既，Switch會幫你自己Elect + LB
重有分Network hierachy去top down砌device既特性
IPv6 NA都考考地，tunnel係NP先會做得多
但係我煲左成套CCNA 200-125 肯定唔會用crypto
我一開始以為1921有得比人access-vpn入黎
BGP係external border gateway protocol
用黎announce自己個Autonomous System有咩Route
但如果Corporate intranet要set首先要copy多幾幅呢d
如果我想係人地公司network開洞,比自己屋企電腦用,係咪NP會識?
你係入面掛個reverse ssh tunnel出黎
did you updated the kernel?
any good short form factor server
my office just move in few years ago
because my company's R&D center is 5 mins walk away
You company R&D is software or hardware ?
Fiber , rental, server, router , staff
係咪應該谷聚你book間party room再同大家分享下
L3 Switch Routing + EIGRP as IGP
這是我一個暴發左既朋友，身邊幾個朋友暴發左，我就窮到閪咁😓
然後Router-Switch manual summarize
當初佢無錢想要電腦，我砌左部2手電腦，由香港拖上東莞比佢
佢打場Golf派利事都3萬幾，比返10萬我洗下都好麻😢
係唯獨唔知點解我office部router係行唔到
ip route 0.0.0.0 0.0.0.0 g0/x