Today I wanted to try and see how many IPv4 prefixes can a Cisco 2600 accommodate in BGP table both global and in VRF table. I have lying around a Cisco 2621XM with 64MB of RAM, so I said to stress it a bit like in the old days when it was productive.
I [...]
I already explained in an older post my home lab for CCIE preparation. My BB1-BB3 routers are Cisco 2600 series and the rest of R1-R6 are emulated with Dynamips. The only problem is that one of the C2600 has too little Flash space to hold the required IOS. Memory [...]
Imagine that you have two or more sites which you want to connect together using MPLS technology. You cannot afford dark fiber and your Service Provider cannot offer you L2 connections of any kind. The only thing your SP can offer is L3 transport. Still, you want to build your own MPLS environment and there [...]
A few days ago I installed two additional NICs in my server that handle the virtual machine for vCenter Server Appliance (vCSA).
After the NICs installation, the Management web interface for vCSA was showing some strange error (see image below).
Let’s assume that you have an IPv4 core backbone on which you did enable MPLS. Your customers are connected to your PE routers and they need to have IPv6 reachability between their sites. To have things more clear, please have a look to the following network topology:
As you [...]
If you are in routing and switching industry, it’s almost impossible not to hear words like MSFC, PFC and DFC in relation with Cisco Catalyst 6500 series, chassis, supervisor and modules. If you didn’t yet, you’re not almost there, working with large enterprise environments.
Even if I see an increasing [...]
Cisco Live 365 describe this as:
“Anthony Sequeira, CCIE, CCSI educates students on four key cornerstones for success in the journey to CCIE. These cornerstones include technical knowledge, study and lab strategies, proper mindset, and physical wellness.”
I can tell you it’s not essentially a technical knowledge session, and Anthony Sequeira [...]
Last week I had to troubleshoot a problem about eBGP peering with an external provider and I think my findings will be interesting for some of you out there.
Let me start with some background information. I have two locations, same ASN, both connected [...]
In the last weeks I was working closely with a Cisco Telepresence team to identify a issue regarding poor performance of the video systems. We did find pretty quickly the issue as being the failure of auto-negotiation of Speed and Duplex on the connection between Cisco switch port and Tandberg endpoint devices.
This was [...]
The original name of this video is “SDN controller DEMO”. I think the “demo” word there is a bit inappropriate used, as actually is more like a Cisco marketing video than demo. Don’t be so surprised, you know how Cisco promote their products.
Just my 2 cents about the SDN/OpenFlow trend that is coming up [...]
For most of us, network engineers, the IT world means anything but art. Still, it seems that out there somebody think Wifi can be use to generate art. And they did a pretty good job.
Timo Arnall, Jørn Knutsen and Einar Sneve Martinussen had this idea to explore the [...]
I just upgraded to WP 3.4 and apparently you can now embed tweets in your posts. I will do this from time to time, when there is something that really capture my interest. I will add the [Twitter IT] prefix to this posts. IT in this case is not coming from Information and Technology, but [...]
As you know from my previous posts, I’m trying to find time to gain some Juniper knowledge. During this “quest” I will add here some basic things about how to start working with Juniper devices. For now I know only the basics of Juniper configuration, but I hope that soon [...]
It has been 4 years since I did register the FirstDigest.com domain and I want to mark this on the blog timeline. Nevertheless, the first tech post will arrive on this blog only on November 2008 as first I had different plans for this domain name. Those of you who were curious enough to read [...]
Last week I got my first Juniper certification, JNCIA-Junos, and I’m pretty excited about it. I had to start with this exam, which is somehow equivalent to CCNA, for two reasons:
- it’s mandatory for all other Juniper exams
– as I start with [...]
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