Go get your safe point, work through that and arrive with joy

Today I learn about putting a point, calculating our safe points or check point on any our duty or work we do and how relaxing it is to had check points on our job.

The ability of deciding safe point(s) on our job achieved from the ability to divide thing based on something. Anything can be divided into smaller parts, even an Atom. So, a big or long-duration jobs could be engineered into smaller job based on your ability or your resources (your strength, your time, numbers of your friend if any).

I defining check point is as a point on a time where we can feel relax and the work is well documented after doing your segment of work and what you are working is you are recognized.

Tips

1. Membuat pengelompokkan.
Kelompokkan kata-kata kedalam group atau kedalam suatu himpunan
2. Cari hubungan
Misalkan 2 buah himpunan sudah berhasil terbentuk, selanjutnya, coba cari hubungan 2 group kata himpunan itu. Kapan dua kelompok kata ini terhubung.

Tips menganalisa sebuah kalimat,
1. Ubahlah sebuah kalimat / statement menjadi sebuah kalimat tanya.

Tips menganalisa seluruh paragraph,

Pembagian dan perkalian

Jika Pembagian adalah pengurangan berulang dan Perkalian adalah penambahan berulang, apa hubungan antara pembagian dan perkalian?

What your configuration do to my mac address table?

What your configuration do to my mac address table appearance?
or
 What your configuration do to my routing table appearance?

SPAN (Switchport Analyz

List of Question

• Which switch that we want to monitor? 
• Are source port and destination port belong to same switch? 
• Which traffic direction we want to monitor? Is it traffic that coming to switch or traffic that leave the switch? or both?
• Do we have existing span configuration on the switch source?
• Are we want to monitor trunk ports? Are you sure all VLAN-ID that allowed on that trunk 
• Do you know that traffic that passed the destination port of RSPAN is always untagged? Do you have a problem with that?
• Do you know that traffic that passed the destination port of Local SPAN isn't always untagged?

Configuring local SPAN

I try to divide this article into 3 parts so help us easy to read:
First. SPAN configuration guidelines
Second. Other restrictions that complement the first
Third. List of Questions
Fourth. The Configuration

SPAN configuration guideline is our guidelines to configure SPAN feature. List of Question are Questions that arise when I copy-paste and rewrote the configuration guidelines with my own word that easy to understand by me. The List of Questions, are questions that pop-up on my mind, and I wish help us to speed up the implementations. You know, we need a questionaire. And, last the answers of the list of questions especially their value will be translated to configuration guide

So, Part 3 is referencing part 1 and 2, Part 2 is referencing 1 ahd Part 1 is from Cisco.

SPAN configuration guidelines

1. Trafik yang bisa dimonitor

2. Destination port cannot be a source port; a source port cannot be a destination port.

3. You cannot have 2 SPAN session  using the same destination port. I rewrote this as: We must create seperate SPAN session for two seperate destination ports. Please have a sight on picture below (I occasionally configure two different destination port that is fastethernet 1/0 and fastethernet 1/1 ports as same SPAN session destination port and the IOS reject it)

 

4.  When you configure a switch port as a SPAN destination port, it is no longer a normal switch port;  only monitored traffic passes through the SPAN destination port

5. Entering SPAN configuration commands does not remove previously configured SPAN parameters. You must enter the no monitor session {session_number | all | local | remote} global configuration command to delete configured SPAN parameters.

6. For local SPAN, outgoing packets through the SPAN destination port carry the original encapsulation headers—untagged or IEEE 802.1Q—if the encapsulation replicate keywords are specified. If the keywords are not specified, the packets are sent in native form. For RSPAN destination ports, outgoing packets are not tagged.

7. You can configure a disabled port to be a source or destination port, but the SPAN function does not start until the destination port and at least one source port or source VLAN are enabled.

8. You cannot mix source VLANs and filter VLANs within a single SPAN session

List of Questions

1. Do we want to use different destination port?
2. Do we want to display the monitored traffic with their original encapsulation headers (untagged or IEEE 802.1Q)? If YES: please use keyword encapsulation replicate, if NO: do not use keyword encapsulation replicate on your SPAN configuration.
3. Do we need to configure a disabled port to be a source port or to be a destination port?

Lets get to configuration

The Configuration

Step 1. configuration terminal
Step 2. no monitor session all
Description: we need to no-ing all monitor session that has been configured in this switch because entering SPAN configuration commands does not remove previously configured SPAN parameters. Or in other words, it will not override the existing / old SPAN configuration in the switch.(Please refer the configuration guidelines point 4).
Un-removed previously configured SPAN parameters also may conflict with you-want-to-enter configuration (Please refer the configuration guidelines point 3)
Step 3. monitor session 1 source interface fa0/1 rx
 or
monitor session 1 source vlan 1 rx
Step 4: monitor session 1 destination interface fa0/1

configuration terminal
no monitor session all
monitor session 1 source interface fa0/1 both

Visio savvy

Hari ini saya belajar menggunakan fitur
Shape > Align Shapes
Shape > Distribute Shapes
Shape > Connect Shape
Shape > Configure Layout