MXes in Junosphere are unsupported, but I tend to use them because I want something a bit closer to the real thing somehow. The VJX is ok, but I like the way the MX doesn’t come with any security-related stuff, and the interfaces start at ge-0/0/0 rather than ge-0/0/1!
The only downside with the virtual MX is that it is a non-supported image, unlike the VJX.
Sometimes when usign an VMX, you find that the topology starts up but you can’t SSH to one or two of the nodes. So you console onto it and discover that (for some reason) the management IP address has been put onto em0 rather than being where it should be in the member0 group applied to fxp0:
root@S1> show configuration groups member0
system {
host-name S1;
backup-router 10.233.255.254;
}
interfaces {
fxp0 {
unit 0 {
family inet; <=== IP address missing!
}
}
}
root@S1> show configuration interfaces em0
unit 0 {
family inet {
address 10.233.248.46/20; <== Here it is.
}
}
The solution to this is to console onto the device and move Continue reading
Not content with digging into the A10 health monitors recently, I thought I should do the same for f5 LTM which has some slightly different setting and, it turns out, works really quite differently. I hate to say it again, … Continue reading
If you liked this post, please do click through to the source at f5 Health Monitors – More Surprises and give me a share/like. Thank you!
I’m doing some studying using Junosphere at the moment, but unfortunately Junosphere can’t emulate a LAN at the moment. Basically the same problem that GNS3 has and (as far as I know) Cisco’s VIRL/CML has as well. So you’ve got to bodge it with Integrated Routing and Bridging (IRB). What I needed topology-wise was this:
LAN segment between S1, R1 and R2
I find Junos a bit counter-intuitive when creating bridge domains. Here I need something quite simple – two ports in a bridge group (no VLANs or anything), but I need to give a VLAN tag value to identify the bridge domain.
Anyway, the process for doing this is as follows:
1. Give the physical interfaces the right encapsulation type – ethernet-bridge
2. Create a bridge domain which has a VLAN-ID and references these two interfaces
3. Create an IRB interface (irb.10) with family inet and an IP address on it
4. In the bridge domain, use “routing-interface irb.10″ to tie the bridge domain and the IP interfaces together.
The result is this:
IRB solution for LAN
The configuration I used was this:
root@S1# show interfaces
ge-0/0/0 {
description "to R1 0/0/1";
Continue reading
LEDE: One of the hardest parts of DevOps movement is explaining the unique value to IT Leadership in conventional organisations that rely on ITIL principles. I'm having success by framing the debate in terms of over-capitalised on assets and under-invested in human infrastructure.
The post Blessay: Over-Capitalized and Under-Invested in Human Infrastructure appeared first on EtherealMind.
This post SHOULD have been published on April 1st, but I need to define the terminology for another upcoming post, so here it is ;)
RFC 2119 defines polite words to use when something really shouldn’t be done. Some network designs I see deserve more colorful terminology.
2014-11-02: Updated with reference to RFC 6919 (/HT to @LapTop006)
Read more ...
Boom – you’ve got to love Junosphere. I just created the Proteus JNCIE study lab in 35 minutes flat. I made the topology of 13 routers, gave everything a hostname, loopback and interface descriptions and then just fired it up. When I did my CCIE I was there for >weeks< trying to get the right kit plugged together!
Have a look below:
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Agenda
Cisco has announced their plans to transition the CCIE Service Provider certification blueprint from Version 3.0 to Version 4.0 starting May 22nd, 2015. The official announcement for the Written and Lab Exam Content Updates can be found here.
There are four key points to this announcement, which are:
CCIE SPv4 Lab Exam Format Changes
The Lab Exam format of SPv4 has been updated to follow the same format as the new CCIE Routing & Switching Version 5.0. This means the exam now consists of three sections: Troubleshooting, Diagnostic, and Configuration.
CCIE SPv4 Hardware & Software Version Changes
Following along with the current CCIE RSv5, CCIE SPv4 now uses all virtual hardware as well. Specifically the new hardware and software variants are as follows:
Both the IOS XR and IOS XE variants are already available as virtual machines that you can download from cisco.com Continue reading
Some fun today. Juniper recently ran a competition they called the Junos Cup 2014. It was modeled after a world cup of sorts, with each challenge involving a country in the name, four Tournament and then – because in the … Continue reading
If you liked this post, please do click through to the source at Juniper’s Day One: Junos Cup 2014 Book and give me a share/like. Thank you!
Do you really need genuine SFP and QSFP modules in your network equipment ? We talk technical with a supplier of OEM modules for your network equipment about the technology, functions and operation of non-vendor SFP optics and modules.
The post PS Show 35 – OEM SFP and QSFP Modules – Do They Work ? appeared first on Packet Pushers Podcast and was written by Greg Ferro.
Cisco has been updating their certifications lately. The CCIE RS got bumped to version 5 and went all virtual. The CCNP RS was then also updated and now it’s time for the CCIE SP.
It seems that Cisco has done a better job lately of tying all the certifications together and providing a more unified exam format. At least this is the indications I’m getting for the CCIE track.
CCIE SP v4 will use the same exam format as the CCIE RS v5. This means that there will be a diagnostic (DIAG) and troubleshooting (TS) module at the CCIE SP lab. First let’s go over the exam domain.
My impression from this is that the v4 blueprint is a bit more generic. This makes it easier to develop the exam content and I also get the feeling that it’s getting more important to have a high level understanding of the different technologies and architecture.
The exam is designed to be dual stack, so you can’t afford to be weak on v6, you must master the v6 topics at the same level as v4. If you get certified you may use the IPv6 Forum Gold logo.
The following topics have been Continue reading
Early in life, we are all made acutely aware of the power of peer pressure. Most of us probably attribute it to a deep need for belonging. But what if that deep sense of belonging is less about social acceptance and more about how we are psychologically wired? In fact, the pursuit of conformity goes beyond mere social dynamics; it is rooted in how our cognitive selves.
While this plays out in very obvious ways for individuals, the dynamics actually hold true for organizations. And for companies, the stakes might be even higher.
In the 1950s, an American psychologist named Solomon Asch ran through a series of experiments to test the effects of conformity on individuals. His studies have been published several times, but one test in particular gives a fascinating look into how we operate.
Asch took a number of participants and asked them very simple cognitive questions. To conduct the study, Asch brought participants into a room that had seven other people. However, these seven people were actually part of the study. The eight individuals were shown a card with a line on it, followed by a card with three lines on it. The Continue reading
