Today I had a chat about MTU with a customer. MTU is my second favorite topic for tech talks in front of the coffee machine, STP is still the first because there are so many misconceptions about it. Even QoS is funny, people has many creative ideas and expectations from it.
Let's talk about MTU. Everything begun today …
Read MoreA few days ago a customer called worried by the flow control counters increasing on his Cisco 4510 switch, he just sent me this asking for an explanation:
CORE_4510#show interfaces flowcontrol Port Send FlowControl Receive FlowControl RxPause TxPause admin oper admin oper --------- -------- -------- …
Read MoreSome time ago I've installed the new core switches for a customer: a couple of Nexus 7000, a couple of 5000 and twelve Nexus 2232TM, Virtual port channels, VLANs, Radius auth and so on.. all the usual configs a good network engineer does.
This means two things:
- I'm CCIE for over one year now
- I need to prepare again the written exam
The last day to test the v4 edition is June 3, 2014, I've passed that exam twice so I expect a little effort to pass it again.
Read MoreTen years ago I've passed my first Cisco exam: CCNA! What was supposed to be just a marginal skill for a junior systems engineer became both my job and my passion.
Ten years and 21 Cisco exams later (and a bunch of other vendors), with 2 labs in Brussels, 1 FAIL and 1 PASS, I'm still excited about networking and I hope …
Read More<img loading="lazy" decoding="async" alt="" class="image_figure image_external image_processed" width="300" height="300" …</picture></figure></p>
Read MoreQuesto post e' dedicato ai networkers iscritti al CUG di AreaNetworking.it per condividere la mia esperienza del Cisco Live! 2013 a Londra.
Ho visto diversi messaggi in ML e dato che la risposta sarebbe un po' lunga e magari puo' interessare a piu' persone ho deciso di scrivere direttamente un post qui. Ho avuto il …
Read MoreToday I've passed 642-874 ARCH exam that in conjunction with CCIE and CCNP entitles to obtain the CCDP certification.
To prepare the exam I've used the official study guide along with the documents in the Cisco Design Zone.
The hardest part of the exam preparation was to study technologies I've never really …
Read MoreQuite often I have to debug a wireless client roaming across lighweight Cisco APs to confirm it moves between APs as expected in the network design.
On the WLC the command is "debug client MAC". The command shows all the events related to the specific client including:
Reassociation received from mobile on AP …
Read More- Got mail from Cisco:
Read More In really enjoyed to read all the blog post of people passing the CCIE lab exam over the years. I've found the stories very inspirational so now it's time for me to give back.
I started working as a system engineer in 2001 supporting Microsoft Windows 2000 client and server for a bank. I had the opportunity to work …
Read More- Cisco stopped to publish CCIE statistics some time ago but in Cisco Live presentations we can find some slides like this:
Read More NTP client / server with authentication
SERVER CONFIG
ntp authentication-key 1 md5 0802657D2A36 7 ntp master 5CLIENT CONFIG
ntp authentication-key 1 md5 1531223F2705 7 ntp authenticate ntp trusted-key 1 ntp server 10.0.12.1 key 1Notes: the client authenticates the time source, server must have the key.
Read More
