Enabling Portfast




-to enable
interfaces {
interface-range ACCESS {
member-range ge-0/0/6 to ge-0/0/45;
protocols {
rstp {
interface ACCESS {
ethernet-switching-options {
bpdu-block {
disable-timeout 60;

-to check EDGE on/off
# run show spanning-tree interface detail | match “Link type”
Link type : Pt-Pt/NONEDGE
Link type : Pt-Pt/NONEDGE
Link type : Pt-Pt/NONEDGE
Link type : Pt-Pt/NONEDGE
Link type : Pt-Pt/NONEDGE
Link type : Pt-Pt/EDGE

Mac 26s
Win 5s

Mac 28s
Win 9s

Ruckus ICX Rollback

I am curios on how to do rollback config in Ruckus when you didn’t cancel the job anything within 1hr.
That feature is standard in Juniper since long time a go
That is useful when you do remotely. In case you miss configure something like netmask that causing you disconnected and impossible for you to reconnect unless you console manually.

After post my question into Ruckus forum, Ruckus employee said that feature is not available.

Got an idea from how Aruba did rollback.
Two things I need to solve which are alias and cron job.
Smarter guy answer my post and here the steps although not perfect enough

to create an alias
#conf t
#alias bkup=copy flash flash file startup-config backup
#alias restor=copy flash flash file backup startup-config
to create a cron job
#conf t
#batch buffer 1 &
#restor &
#execute batch 1 after 00:00:01
#sh batch schedule
Batch buffer 1 will be executed 0 days 0 hours 0 minutes 52 seconds from now
NOTE:can’t put reload on batch

to reload after 2min
#reload 00:00:02
Those steps achieve my goal but almost perfect because
1. I can’t put reload in batch (see notes above), that’s why I need to put batch and reload in consecutive order

2. will be better if I can copy backup to running-config directly
I can do that but not affect current running-config
for example
current hostname SW1
wr me
copy startup-config to backup
change hostname to SW2
copy backup to running-config
those wont change my running hostname

Using Nginx as Load Balancer in Docker

-pull nginx

# docker pull nginx
# docker pull nginxdemos/hello

-run two nginx
because I want to set static ip to www1 and www2.
I need to create my own network

# docker network create –subnet= vlan10
# docker run –name=www1 –hostname=www1 –net vlan10 –ip -p 81:80 -d nginxdemos/hello

# docker run –name=www2 –hostname=www2 –net vlan10 –ip -p 82:80 -d nginxdemos/hello

-create nginx load balancer
# cat nginx.conf
upstream loadbalance {
server {
    location / {
        proxy_pass http://loadbalance;


# cat Dockerfile
FROM nginx
RUN rm /etc/nginx/conf.d/default.conf

COPY nginx.conf /etc/nginx/conf.d/default.conf

# docker build -t nginxbalancer .

# docker container run -p 80:80 -d nginxbalancer

-test accessing

it should show “Server address:”

-test shutdown both www1 and www2
# docker stop www1

# docker stop www2

test accessing

it should show bad gateway

-test run www1 again
# docker start www1
it should show “Server address:”

Replacing Acer E5-476G LCD

I have Acer Aspire E5-476G which the LCD screen has a white screen on a quarter of it.
It also has vertical lines.
It is a common problem in Acer.
I never encounter an LCD problem in Dell after using it for 6 years

After searching, I found that it has 2 types.
HD 1366×768 Glossy or FHD 1920×1080 Matte
The price difference on AliExpress is only $3, but I can’t wait for 1 month if shipping from China.

I try to fix myself because Repair Shop charges me double of the LCD price.
Which is in between $50-$70 range

After searching on Youtube, I think I can do myself.
But I have a backup plan too. Which is find a local store with the cheapest LCD price and cheapest installation fee.
Installation fee only $3.5
So I bought from a local store. HD type only $32
I have 2 options, which are doing it myself and save $3.5 or let the shop do it for me.

If I do it myself, I’ll have experience on it and will be useful if the same thing happens next time


-Phillips screwdrivers
-guitar plectrum ( a small triangle plastic). You can use any thin plastic actually (ATM or CC card)


Distinguish Original SanDisk

In Indonesia, there are 2 SanDisk Distributor. Previously 4 but now only 2 left

1. PT. Astrindo Senayasa
Mangga Dua Square, Ruko blok G No. 24-27, Jl. Gunung Sahari Raya no. 1 Jakarta Utara 10730 Indonesia
Tel: +6221 2938 2288 Fax: +6221 2938 2289

“GENUINE PRODUCT ASTRINDO” hologram on the package

2. PT. Datascrip
Jl Selaparang Blok. B-15 Kav. 9 Komp. Kemayoran Jakarta Pusat 10610 Indonesia
Tel: +6221 6544515 ex. 280 Fax: +6221 6544811-12

“DATASCRIP” hologram on the package

Hologram Datascrip
Made in China
Font thinner
2019-05-29 13_00_18-SanDisk.pdf - Foxit Reader.png
2019-05-29 13_02_27-SanDisk.pdf - Foxit Reader.png
-check Read/Write test with Android “A1 SD Bench” app
-check with Windows H2testw app
2019-05-27 22_22_13-H2testw _ Progress.png

Automatically backup config to scp or tftp when “write mem”

In Cisco, I can automatically backup config using scp or tftp to other location every time I issue “wr me”

How to achieve the same in other brand?

path scp://root:eve@$h










iDrac Network connection has been dropped

Using iDrac Virtual Console
‘The viewer has terminated
Reason : The network connection has been dropped.’

Edit C:\Program Files (x86)\Java\jre1.8.0_181\lib\security\java.security
jdk.tls.disabledAlgorithms=SSLv3, RC4, MD5withRSA, DH keySize < 1024, \
EC keySize < 224, DES40_CBC, RC4_40

Recovery partition shown up on my Desktop

Since update windows 10 to update 1803, recovery partition shown up as drive D on my Desktop.
Here how to hide it
-run cmd as Administrator
> diskpart
DISKPART> list vol
  Volume ###  Ltr  Label        Fs     Type        Size     Status     Info
  ———-  —  ———–  —–  ———-  ——-  ———  ——–
  Volume 0     E                       DVD-ROM         0 B  No Media
  Volume 1     D                NTFS   Partition    450 MB  Healthy
  Volume 2     C                NTFS   Partition   1862 GB  Healthy    Boot
  Volume 3                      FAT32  Partition    100 MB  Healthy    System
DISKPART> select vol 1
Volume 1 is the selected volume.
DISKPART> remove letter=d
DiskPart successfully removed the drive letter or mount point.

Fiber Cable

2018-05-17 10_54_38-Fiber Cable - Evernote










OM1,OM2,OM3 and OM4 Multimode Fibers
* Color – Orange
* Core Size – 62.5um
* Data Rate – 1GB @ 850nm
* Distance – Up to 300 meters
* Applications – Short-Haul Networks, Local Area Networks (LANs) & Private Networks
* 62.5/125 Multimode Duplex Fiber Cable
* Color – Orange
* Core Size – 50um
* Data Rate – 1GB @ 850nm
* Distance – Up to 600 meters
* Generally used for shorter distances • 2x Distance Capacity of OM1
* Applications – Short-Haul Networks, Local Area Networks (LANs) & Private Networks
* OM2 Fiber Optic Multimode Cable

OM3 – Laser-Optimized Multimode
* Color – Aqua
* Core Size – 50um
* Date Rate – 10GB @ 850nm
* Distance – Up to 300 meters
* Uses fewer modes of light, enabling increased speeds
* Able to run 40GB or 100GB up to 100 meters utilizing a MPO connector
* Applications – Larger Private Networks
* 10 Gigabit Laser Optimized Aqua OM3 Fiber Optic Cables

OM4 – Laser-Optimized Multimode
* Color – Aqua
* Core Size – 50um
* Data Rate – 10GB @ 850nm
* Distance – Up to 550 meters
* Able to run 100GB up to 150 meters utilizing a MPO connector
* Applications – High-Speed Networks – Data Centers, Financial Centers & Corporate Campuses
* OM4 50µ – Multimode 10Giga/550m optimized Cables

What Is OM5 Fiber?
According to the ISO/IEC 11801, OM5 fiber specifies a wider range of wavelengths between 850nm and 953nm. It was created to support short wavelength division multiplexing (SWDM), which is one of the many new technologies being developed for transmitting 40Gb/s and 100Gb/s. In June 2016, ANSI/TIA-492AAAE, the new wideband multimode fiber standard, was approved for publication. And in October of 2016, OM5 fiber was announced as the official designation for cabling containing WBMMF (Wide Band Multimode Fiber) by ISO/IEC 11801. From then on, OM5 may be a potential new option for data centers that require greater link distances and higher speeds.

SC to Ethernet Converter

SFP to Ethernet Converter
A simplex fiber cable consists of a single strand of glass of plastic fiber. Simplex fiber is most often used where only a single transmit and/or receive line is required between devices or when a multiplex data signal is used (bi-directional communication over a single fiber).

A duplex fiber cable consists of two strands of glass or plastic fiber. Typically found in a “zipcord” construction format, this cable is most often used for duplex communication between devices where a separate transmit and receive are required.

APC (Angled Physical Contact)
APC connectors feature a fiber end face that is polished at an 8-degree angle
APC connectors are green
APC can only be connected to APC
APC has better performance than UPC
UPC (Ultra Physical Contact)
UPC connectors are polished with no angle
UPC connectors are blue
Single Mode
Single Mode fiber optic cable has a small diametral core that allows only one mode of light to propagate. Because of this, the number of light reflections created as the light passes through the core decreases, lowering attenuation and creating the ability for the signal to travel further. This application is typically used in long distance, higher bandwidth runs by Telcos, CATV companies, and Colleges and Universities.
Multimode fiber optic cable has a large diametral core that allows multiple modes of light to propagate. Because of this, the number of light reflections created as the light passes through the core increases, creating the ability for more data to pass through at a given time. Because of the high dispersion and attenuation rate with this type of fiber, the quality of the signal is reduced over long distances. This application is typically used for short distance, data and audio/video applications in LANs. RF broadband signals, such as what cable companies commonly use, cannot be transmitted over multimode fiber.