(TIL) Today I Learned...

Started by Seittit, January 13, 2015, 03:50:21 AM

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Otanx

#375
July 23, 2020, 05:50:24 PM
TIL single mode optics are expensive.  11K for a 100G-LR optic, 4K for a 100G-bidi optic. Might not get my single mode cable plant. The OM4 is more expensive by about 30K, but the difference in optics is over 100K. Still going to propose it. Try to use the never replace the cable again angle. Also trying to get over my dislike for AOC instead of doing fiber at all. I will still need the fiber for other stuff, but my 100G might not need it.

-Otanx

wintermute000

#376
July 23, 2020, 07:47:12 PM Last Edit: July 23, 2020, 07:49:06 PM by wintermute000
yeah. I recall a customer freaking out about how 4x 40Gb LR optics were the same cost as a couple of switches. That vendor rubber stamp at the end of the finisar conveyor belt must be made of unobtanium tears.

My rule of thumb when guesstimating is to 5x the cost (using the big gorilla vendor starting with C as the reference, however, most are not much better)
Its a nice dream to go entirely single mode, however, is it worth the price of the optics, and when in reality everything within the same hall is fine with multi-mode.

deanwebb

#377
July 24, 2020, 09:16:06 AM
Looks like I'm about to learn about the differences between single-mode and multi-mode fiber... carry on, gents.
Take a baseball bat and trash all the routers, shout out "IT'S A NETWORK PROBLEM NOW, SUCKERS!" and then peel out of the parking lot in your Ferrari.
"The world could perish if people only worked on things that were easy to handle." -- Vladimir Savchenko
Вопросы есть? Вопросов нет! | BCEB: Belkin Certified Expert Baffler | "Plan B is Plan A with an element of panic." -- John Clarke
Accounting is architecture, remember that!
Air gaps are high-latency Internet connections.

Otanx

#378
July 24, 2020, 12:00:54 PM
Quote from: deanwebb on July 24, 2020, 09:16:06 AM
Looks like I'm about to learn about the differences between single-mode and multi-mode fiber... carry on, gents.

Got you:
Fiber 101: https://www.reddit.com/r/networking/comments/3gx5dz/ysk_if_you_dont_about_fiber_optics_and_how_they/
The advanced class: https://archive.nanog.org/sites/default/files/2_Steenbergen_Tutorial_New_And_v2.pdf

These are both really good. I think anyone that deals with fiber, or high speed networking should read them. Maybe not understand everything, especially the advanced class, but have at least seen it.

-Otanx

config t

#379
July 25, 2020, 11:25:40 PM
TIL I don't know as much about FO as I thought I did :)

Had to google the OM standards. We don't do no high speed netwrokin' around here. 1Gb backbone, baby  :smug:
:matrix:

Please don't mistake my experience for intelligence.

deanwebb

#380
July 27, 2020, 08:27:27 AM
SFP -- Small form factor pluggable. This is the most common one you'll see these days in gigabit. Has an LC connector on it. Some people call these "mini-GBICs". Those people are idiots.

^ I lol'd. :lol:
Take a baseball bat and trash all the routers, shout out "IT'S A NETWORK PROBLEM NOW, SUCKERS!" and then peel out of the parking lot in your Ferrari.
"The world could perish if people only worked on things that were easy to handle." -- Vladimir Savchenko
Вопросы есть? Вопросов нет! | BCEB: Belkin Certified Expert Baffler | "Plan B is Plan A with an element of panic." -- John Clarke
Accounting is architecture, remember that!
Air gaps are high-latency Internet connections.

config t

#381
July 29, 2020, 05:57:00 AM
Today I wrestled with the understanding of aggregate bandwidth in the context of a KG-175D TACLANE

I think 200Mb/s aggregate bandwidth means that both 100Mb interfaces (PT and CT) can operate at full capacity simultaneously. But doesn't that mean the throughput is still 100Mb? If that's the case, why does aggregate bandwidth matter?
:matrix:

Please don't mistake my experience for intelligence.

deanwebb

#382
July 29, 2020, 09:53:29 AM
Maybe it's 200Mbps until one of the 100 lines fails... ?
Take a baseball bat and trash all the routers, shout out "IT'S A NETWORK PROBLEM NOW, SUCKERS!" and then peel out of the parking lot in your Ferrari.
"The world could perish if people only worked on things that were easy to handle." -- Vladimir Savchenko
Вопросы есть? Вопросов нет! | BCEB: Belkin Certified Expert Baffler | "Plan B is Plan A with an element of panic." -- John Clarke
Accounting is architecture, remember that!
Air gaps are high-latency Internet connections.

wintermute000

#383
July 29, 2020, 09:45:43 PM
just semantics, until it comes to licensing :/

icecream-guy

#384
July 31, 2020, 12:38:36 PM
TIL, whell yesterday, that if you don't static set mac addresses your ASA multi context virtual interfaces that they will all use the mac address of the physical interface, causing big issues,  also auto-assigning mac address is not safe, research shows, that will multiple firewalls in the same broadcast domain there is slight possibility that different firewalls may select the same auto-assigned mac address on the same broadcast domain,  I also learned that there are reserved MAC addresses, like RFC1918 for IP's  that can be used for this and VM configurations.

:mrgreen:
:professorcat:

My Moral Fibers have been cut.

wintermute000

#385
July 31, 2020, 08:26:08 PM
Friends don't let friends use ASAs in 2020!

icecream-guy

#386
August 02, 2020, 06:04:17 AM
Quote from: wintermute000 on July 31, 2020, 08:26:08 PM
Friends don't let friends use ASAs in 2020!

sipping the Cisco Kool-Ade. 
yar, if you are a Cisco shop. 
:professorcat:

My Moral Fibers have been cut.

deanwebb

#387
August 04, 2020, 09:43:39 AM
TIL that people are still using ASAs in 2020. :smug:
Take a baseball bat and trash all the routers, shout out "IT'S A NETWORK PROBLEM NOW, SUCKERS!" and then peel out of the parking lot in your Ferrari.
"The world could perish if people only worked on things that were easy to handle." -- Vladimir Savchenko
Вопросы есть? Вопросов нет! | BCEB: Belkin Certified Expert Baffler | "Plan B is Plan A with an element of panic." -- John Clarke
Accounting is architecture, remember that!
Air gaps are high-latency Internet connections.

config t

#388
August 06, 2020, 05:11:40 PM
TIL Layer 2 is still layer 2 no matter if layer 2 was layer 2 before you knew what layer 2 was... LAYER 2 IS STILL LAYER 2. I'm done.. but for real.. everyone wants to talk smack about spanning-tree until it's a problem and then nobody seems to know how to troubleshoot spanning-tree or believe me when I ask if anyone checked layer 2 before escalating this "major" ticket and then I run some simple @*%^ing commands like.. i dunno
Code Select
show spanning-tree
:matrix:

Please don't mistake my experience for intelligence.

icecream-guy

#389
August 06, 2020, 08:51:14 PM
Quote from: config t on August 06, 2020, 05:11:40 PM
TIL Layer 2 is still layer 2 no matter if layer 2 was layer 2 before you knew what layer 2 was... LAYER 2 IS STILL LAYER 2. I'm done.. but for real.. everyone wants to talk smack about spanning-tree until it's a problem and then nobody seems to know how to troubleshoot spanning-tree or believe me when I ask if anyone checked layer 2 before escalating this "major" ticket and then I run some simple @*%^ing commands like.. i dunno
Code Select
show spanning-tree

just be glad it ain't layer 2 1/2.   >:D

for most BPDU's are a tough pill to swallow, 'specially with all them modes
:professorcat:

My Moral Fibers have been cut.
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