I make several posts talking about how you can use Linux shells on your Cisco device. But what about opposite? In this post we’ll have a look at the Embedded Service Router which is running a full Cisco router application on a Linux host. This is mostly meant for IoT solutions but it is also a great lab solution if you can get your hands on it.
I had to convert a Cisco ASA 5506 to FTD the other day and baffled because no matter what I did the management interface was admin down / down. This is a problem in FTD since you can’t simply type a no shut and you can’t join it to a FMC without the management interface.
One of the more frustrating things that comes from studying BGP is that it isn’t always obvious why it is selecting one path over another. Fortunately, I came across a cool new BGP feature in modern IOS-XE that explains exactly that!
This can be particularly useful for CCIE study while your working through crazy practice labs.
I love FirePower! It’s great! But every now and then FirePower Management Center gets rebooted during a deployment, and the FMC wants to push the config so much that it will keep on trying for a few thousand hours! While we appreciate the effort, this is a quick way to tell FMC to take a break.
I’m working on some finishing up some actual posts but in the mean time, check out my new socks!
Over the holidays I got around to updating some old Cisco Spark stuff over to Webex Teams. Since I haven’t made a post a little bit, I figured I would share some of the fun with you all.
Today we will use Guestshell with EEM to have the router notify us in Webex Teams when the routing table changes!
I’ll be at Cisco Live in Orlando, come say hi…if you can find me 🙂
Chris Lunsford at Cisco tells me that this stamp is very special!
I feel honoured enough to make this post!
Man I really need to get around to finishing some posts on here! I got some neat ideas I’m working on finishing soon(ish?)!
In the meantime I have been experimenting with doing some labbing on Twitch at:
I’m currently going over some CCNA/CCNP Security stuff on there so you can check out the recordings if you are interested. They are still a bit rough but I’m getting there. Eventually I will probably either cut up the streams and dump them on YouTube or record them but its all for fun.
I first started writing this a couple years ago but the post got shelved and my excitement for LISP faded away….Fortunately for us, LISP is making a bit of a comeback because it is a central component of Cisco’s SD-Access / Campus Fabric solution…and I have some time off during the Xmas holidays!
I’ve been talking about Infrastructure as Code / Automation / Python a lot with colleagues and peers so I figured I may as well make a quick intro to ansible post since it is just too hot out today.
I’ll preface this by saying, this is only really covered exam wise in the CCIE Written and possibly the cloud track but I figure it might be neat to see. If this is decently well received I might continue on and look at some of the other Evolving Technologies in the written.
Yesterday we did a quick discussion on what python is all about, I closed things out by showing a simple script that runs a show command and prints the results. Running a script that pushes commands and looks for certain output is called “screen scraping” since python doesn’t know or care what device it connects to and what the output should look like so it just “scraps” the results and lets you deal with it.Yesterday we did a quick discussion on what python is all about, I closed things out by showing a simple script that runs a show command and prints the results. Running a script that pushes commands and looks for certain output is called “screen scraping” since python doesn’t know or care what device it connects to and what the output should look like so it just “scraps” the results and lets you deal with it.
Python keeps coming up again and again in various networking discussions since people are always debating exactly how much automation stuff you should learn as you get more senior.Python keeps coming up again and again in various networking discussions since people are always debating exactly how much automation stuff you should learn as you get more senior.
I got to play with with the upcoming 16.6 CSR release and it finally has guestshell!
Guestshell is a linux shell that we can access from a Cisco device that lets do some interesting things.
Lately we have been looking at various automation topics like Python where we can do some configuration or grab some output on a few boxes. Today we are going to kick the tires with Cisco’s Embedded Event Manager (EEM), the neat difference with this feature is that it runs directly on the Cisco device so it can run based on events like a command being entered or the router getting a new CDP neighbor.
I wrote this for the CCNA sub but might as well share it here a well
Since everyone loves Infrastructure topics (right?!?!?) lets play with a neat feature on the R&S exam called IP SLA. I figure I might highlight some of the more overlooked topics in this sub.
cumulus@cumulus:~$ sudo ifconfig swp1 10.1.2.1/24
cumulus@cumulus:~$ sudo ifconfig swp1 up
cumulus@cumulus:~$ sudo vtysh
Hello, this is FRRouting (version 3.1+cl3u1).
Copyright 1996-2005 Kunihiro Ishiguro, et al.
cumulus# conf t
cumulus(config)# host CSW01
babel Make Babel instance command
bgp BGP information
eigrp Start EIGRP configuration
isis ISO IS-IS
ospf Start OSPF configuration
ospf6 Open Shortest Path First (OSPF) for IPv6
CSW01(config)# router ei 123
CSW01(config-router)# network 10.1.2.0/24
CSW01# show ip eigrp neighbors
EIGRP neighbors for AS(123)
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 10.1.2.2 swp1 10 0 0 2 0 2
My my, I’ve been meaning to make a few SDN posts for ages! Fortunately my golf game got cancelled today and I figured it was finally time to get this started.
Since I still have my ASA lab up, let’s play with two types of VPNs.