Using DCNM to Automate Cisco FabricPath Operations
In my final post on Cisco’s Data Center Network Manager (DCNM), I’m taking a look at the deployment capabilities and templating features which allow configuration to be deployed automatically to multiple devices. In its simplest case, this might be used to set a new local username / password on all devices in the fabric, but in theory it can be used for much more.
DCNM Scripting
Let’s get one thing straight right out of the gate: this ain’t no Jinja2 templating system. While DCNM’s templates support the use of variables and some basic loop and conditional structures, the syntax is fairly limited and the only real-time interaction with the device during the execution of the template amounts to a variable containing the output of the last command issued. There are also very few system variables provided to tell you what’s going on. For example I couldn’t find a variable containing the name of the current device; I had to issue a hostname command and evaluate the response in order to confirm which device I was connecting to. That said, with a little creativity and a lot of patience, it’s possible to develop scripts which do useful things to the fabric.
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Q&A: Migrating to Modern Data Center Infrastructure
One of my readers sent me a list of questions after watching some of my videos, starting with a generic one:
While working self within large corporations for a long time, I am asking myself how it will be possible to move from messy infrastructure we grew over the years to a modern architecture.
Usually by building a parallel infrastructure and eventually retiring the old one, otherwise you’ll end up with layers of kludges. Obviously, the old infrastructure will lurk around for years (I know people who use this approach and currently run three generations of infrastructure).
Read more ...February 2017 CCDE Training is over ! Waiting the attendees success now !
My February 2017 CCDE class is now over. The duration of the course was for 11 days and as usual it started with lots of advanced technology lessons. All the critical CCDE exam topics (IGP, BGP , MPLS and the other technologies) were covered in detail from the design point of view. A minimum of […]
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Python – Kirk Byers Course Week 3 Part 2
This post will describe the exercises and solutions for week three of Kirk Byers Python for Network Engineers.
Exercise two of week three we already completed in a previous post where we used a For loop to loop through the BGP output.
Let’s move on to exercise three instead:
III. You have the following 'show ip int brief' output. show_ip_int_brief = ''' Interface IP-Address OK? Method Status Protocol FastEthernet0 unassigned YES unset up up FastEthernet1 unassigned YES unset up up FastEthernet2 unassigned YES unset down down FastEthernet3 unassigned YES unset up up FastEthernet4 6.9.4.10 YES NVRAM up up NVI0 6.9.4.10 YES unset up up Tunnel1 16.25.253.2 YES NVRAM up down Tunnel2 16.25.253.6 YES NVRAM up down Vlan1 unassigned YES NVRAM down down Vlan10 10.220.88.1 YES NVRAM up up Vlan20 192.168.0.1 YES NVRAM down down Vlan100 10.220.84.1 YES NVRAM up up ''' From this output, create a list where each element in the list is a tuple consisting of (interface_name, ip_address, status, protocol). Only include interfaces that are in the up/up state. Print this list to standard output.
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