Ian Adams
@NetEng_Ian
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Sr Network Engineer, InfoSec, SysAdmin, EMT, Chimney Sweep. #BLM . Tech is for EVERYONE. (he, him, his)
Pasadena, CA
Joined March 2012
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Can't remember who recommended this tool (
@TracketPacer
maybe?), but it arrived in the mail today.
My new life starts NOW. 🎉
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I swear it's only temporary!
... This tweet will be really funny in 7 years when this dumb switch is still in place, and the root bridge.
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"Take Your Kid to the Data Center" Day.
On-screen: How to factory-reset a dual-sup Catalyst 4500:
1. erase nvram:
2. erase slavenvram:
3. redundancy reload shelf
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Little known fact: If you hold a Cisco router like an '80s boom box, it plays the entire Licensed to Ill album by Beastie Boys.
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New tool alert! I've seen a few others mention this Miller Electric IET Cable Connector Insertion or Extraction Tool, and now I have one of my very own.
Works quite well for dense cabling. I'm impressed.
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It's 9:53pm, 21 degrees outside. I'm in an IDF, 1523.49 miles from home, power cycling a switch.
How's your Tuesday evening going?
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Sometimes, when it's 2:30am, and you've spent hours swapping out EOL switches, things get... weird...
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I don't always crawl around on the dirty floors of data centers, but when I do, it's it my nicest shirt.
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Old network problem: 1997. We had to bulk-order 3Com 10Base-T NICs and install them in Micron desktops. All plugged into a giant HUB. Got a batch of 20 NICs that all had the SAME MAC ADDRESS.
Imagine the chaos on a huge collision/broadcast domain, with 20 duplicate MACs mixed in.
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A classic tale that teaches children to Listen. Learn. Forward. And occasionally Discard.
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OMG, OMG, OMG. This is not a joke.
Our Cisco TAC engineer's name is Sherlock Holmes.
....We are in VERY good hands. He's on the case!
I don't think I've ever been this happy working on a Cisco issue.
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@IanColdwater
Holy hell. That tweet was supposed to say "We don't DESERVE
@IanColdwater
"
Mental note: Don't tweet on 2 hours of sleep.
Love you, Ian! ♥️
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Today's lesson: Don't assume Layer 1 is OK just because you have link lights or even activity lights. This was the root cause of a major problem today.
Pin 2 of an older Cat6 keystone in a patch panel failed. That's BI_DA- in 1000Base-T, or Transm- in 10/100Base-T.
---🧵
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Inspired by
@TracketPacer
, I present to you, my understanding, as a Network Engineer, of the OSI Model.🐉
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That feeling when the tang breaks inside the keystone, turning the cable into Excalibur.
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OK, I swear, last tweet about the cable extraction tool for a while, but I just found another use for it.
Got a stubborn SFP+ out without hurting my fingers. Woot!
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Who has two thumbs and proved it wasn't the network?
This guy!
Not pictured: The 2nd thumb being used to hold the cell phone.
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Opinions? Is this a “fair” Network Engineering interview test/exercise? Not the diagram itself, but the concept: Kind of like the old CCNP TSHOOT test, I present the candidate with a virtual network that’s broken in a couple ways and needs a couple configuration additions: (1/5)
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This annoys me. Someone legitimately asking a question, and while there's a bunch of replies with accurate to semi-accurate answers, there's some smart-ass responses too.
Just answer the question and support folks as they grow in this industry. This stuff is confusing as it is.
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TBT: That time we swapped a 6509 for a 4507. Circa 2017.
I was so young. So full of hopes and dreams...
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With what
@Cisco
charges for their OEM SFPs, this is really how they should be delivered...
"Your small form-factor pluggable, Sir."
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@cherthedev
@amarchenkova
@haysstanford
You know what? You are 100% correct. That was a cheap shot and I know better. I really do know better, and I'm embarrassed for having said it.
I really appreciate you calling me out on it. My sincerest apologies.
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The perfect t-shirt for a Network Engineer working in Los Angeles FM radio doesn't exi-
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Would it be too aggressive to wear my
@thousandeyes
"Go ahead, blame the network." shirt to
#RSAC
tomorrow?
At heart, I'm a NetEng who has serious imposter syndrome when around serious InfoSec people. 😁
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Perfect Friday afternoon activity: Kick your feet up, sit back, and just enjoy the data enter air-conditioning.
#NoChangeFridays
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Update: Watched the new Matrix movie last night. I must have missed the part where Neo made a misogynistic remark about women in Network Engineering, then was attacked by swarms of evil "bots" trying to cancel him.
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Behold! My Network Engineering field bag in all its glory!
... Guess which item is the most critical to my work.
I'll give you a hint: It's not the coax stripper.
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Confirmation that
@TracketPacer
is one of my most favoriteist people on the planet.
#CiscoLive
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@XylaFoxlin
is a goddamn national treasure!
There is a slight chance I should probably not be trusted with 12 foot skeletons in the future
🚨NEW VIDEO NOW LIVE🚨
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After tonight, the switch in my profile photo goes out of service. Kind of sad, really...
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Update to my Layer 1 thread:
@mrhameljr
has changed my life by introducing me to a feature I had no idea existed: Time-Domain Reflectometer (TDR)
How did I not know about this before?!!
(Screenshot taken on a production Catalyst 9400.)
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The passing of
@nickrusso42518
really has me thinking about how much I love this NetEng community. Many of you experienced my hugs and arm-around-shoulder hug-things at CL this year - and now you know why. Wish I had gotten the chance to meet Nick in person to give him one. ❤️
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🎶In the Cisco, the Cisco of Life🎶
Or, today's installment of "Adventures in Network Engineering"
Router name: SIMBA-RT01
🦁👑
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@DoomsdayGoth
There's a ton of network engineers here on twitter who would love to talk Layer 1 / cables / connectors until your ears bleed, myself included! 😁
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@ravenscimaven
Am I the only one who feels like Dr. Raven's successes are all of our successes?.. 🤔
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Other than 8.8.8.8, what's your favorite targets in the US to ping for the old "Am I connected to the Internet?" test?
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Cisco told me it was a 160 day lead time. Showed up in like 30 days.
The supply chain giveth, and the supply chain taketh away.
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Today's shirt matches today's mood.
"Come at me, bro.
I've got NetFlow and syslog logs.
What do you got? Nothing. That's what!"🦹
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"I'm not dead yet!"
...Not sure how this got in the junk pile...
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When there's a thermal sensor issue with your Cisco UCS and the fans are running at 300%
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On a call, troubleshooting a port with high utilization: One of the other engineers keeps saying, "Yeah, that port is pegging."
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Name a product that was great in theory but horrible in execution. I'll start:
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Seriously considering making a large Palo Alto purchase right now... We're having a bad Cisco day.
Just keep telling myself:
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Ok, clearly, I need to write a Network Engineering book.
@CiscoPress
, can I get an advance?
...And maybe
@Jaddyy
can co-author.🤔
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For those who doubt, witness the POWER of the cable extraction tool!
A little blurry because I was on a ladder about 9 feet in the air.
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I am so sick of Cisco phones I could puke. Latest ticket: Cisco 8832 is not sending DTMF tones, so people can't dial into Zoom calls.
All I'm saying is I never had this problem with old digital Avaya phones on a PBX... Sigh.
VoIP: Voice over Irritation/Pain.
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Apparently all men have a favorite social security number. What's yours??
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I tracked down
@TracketPacer
and delivered her mystery bag's contents!!! A one of a kind t-shirt with a quote from a brilliant network engineer. (BTW, she's even more amazing in person than I could have imagined)
#CiscoLive
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This is what it looks like when my glorious Network Engineering backpack pukes.
The things I need access to most often are normally stored in the outside pockets.
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Thanks for keeping my four SFP+s so very safe, NetApp!
Gotta love tech packaging sometimes... One per box 😁
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Go easy on Bernie.
Those of us who have spent time in data centers can relate.
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Ok, am I really the only Network Engineer... or any kind of tech professional for that matter... that uses a Windows laptop?
I'm the only one on my NetEng team that does.
And all of these twitter photos I see going by...
When did everyone move to Macs?
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Remember the other day when I said I was so sick of Cisco phones I could puke? 30 mins later I suddenly got a 102.7 fever and puked.
I and my 8832 phones are all better now. Fever gone and the DTMF prob was a phone/CUBE communication issue, caused by a dACL.
Still, CUCM is like:
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Adventures in Network Engineering: I should buy a lottery ticket. Toning out a cable in this tray. FIRST cable I probed was the winner!
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NGL, I'm very proud of this custom cable I built for a small MPLS circuit I installed like 8 years ago. 4 HSDSL links feeding a 5 Meg MPLS circuit.
Retired today, but man, I put so much love into this cable...
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The dangers of pulling old cables while wearing glasses.
Swear to God, this just happened. Popped a patch cable out, and it somehow got between my glasses and my face...
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Random repost from last year's Cisco Live. Love this photo with
@TracketPacer
and
@petergjones
😁
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I have 16 mostly populated 48-port blades to swap out on a couple big Cisco switches.
This was gonna suck, but
@KarstenIwen
turned me on to SergentClips last week, so I ordered a pack, and tossed some labels on them.
These things are going to make the job so much easier!
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Racking some new ProLiant servers today, and figured out you can store the top cover at a 90 degree angle while you install memory.
I feel like I've wasted 20 years of my life not knowing this.
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Was supposed to upgrade a switch stack tonight that's been up for 6 years and 21 days... But I'm just not feeling it.
If it's not super urgent, it should OK to delay if you're not in the right head space. Better to not make a big mistake. Especially with network gear.
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This is seriously my favorite piece of SWAG I've received in 5 years of
#CiscoLive
. Thank you so much
@petergjones
!
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Happy Friday-before-Christmas! Your Networking Engineering Grinch has a very special present for you...
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Update on swapping Cisco blades with my new
@sergeantclip
SergentClips.
Kind of a game-changer. Two blades swapped in record time.
And don't judge my cable management! I've seen worse. 😁
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After my data center romance novels and my "7 Love Languages of the OSI Model" book get published, I'll shift my focus to a children's picture book.
This is my life's new direction.
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I always say the difference between SysAdmins and Network Engineers is that NetEngs play with live ammo.
No better example than a NetEng with access to a BGP router connected to the Internet.
Enter those commands carefully!
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Cisco ISE pro tip, I JUST figured out... You can paste in MAC addresses into a search field in different formats, and they all work! ...So many wasted minutes over the years...
All good:
11:22:33:44:55:66
1122:3344:5566
112233445566
1122.3344.5566
11.22.33.44.55.66
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Damn you , jumbo frames!!!!
... I don't want to talk about it.😠
(Mental note: MTU is applied at the port-channel level)
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Another problem solved with the most valuable tool in all of I.T.
We love you, Clippy!
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Fun NetEng lab experiment: Migrate an SVI off one switch and onto another as fast as possible. Reuse the old MAC address to avoid ARP issues.
In this experiment, did not lose a single packet.
Of course, an FHRP could make this unnecessary, but this could be a useful trick.
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Finally got around to upgrading to Cisco Modeling Labs 2.7. These new IOS on Linux (IOL) images fully boot in less than 5 seconds!
Excited to try and figure out how to use the new SD-WAN images. I'm mostly Meraki, so playing with Viptela has been on my to-do list for a while now.
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Hey, you! Are you SURE that telnet is disabled on all your gear? Really sure? Didn't forget to do this somewhere?
Switch(config)
#line
vty 0 15
Switch(config-line)
#transport
input ssh
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Well, exciting night. South Pasadena Police chase went back and forth by my house. Now the guy seems to be barricaded in a house a couple blocks away.
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"switchport trunk allowed vlan 𝙖𝙙𝙙 321"
Caught myself forgetting the magic "add" juuuuust at the last second!
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