The UCS Central appliance is on it’s way to be a proper centralized management platform for multiple UCS domains, but it’s not quite there yet. There are little simple things missing, such as custom SSL certificates. I had to get UCS Central using a proper SSL certificate the other day and couldn’t really find anything on how to do it. After figuring out how to do it, I decided to document it here!

I’m not getting into how you can generate a SSL private key, there are plenty of other tutorials covering those things. You’ve got two options; generate the … Read more


When you need to only the change the unified ports inside an expansion slot of a Nexus 5500, you do not have to reload the entire switch to activate the unified port changes. You can simply restart only the module like this:

nx5548up-a# config t
nx5548up-a(config)# slot 2
nx5548up-a(config-slot)# port 1-16 type fc
nx5548up-a(config-slot)# end
nx5548up-a# copy run start
nx5548up-a# poweroff module 2
nx5548up-a# no poweroff module 2

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Brad Hedlund‘s blog is one of my favorite sources of excellent UCS (and other general) material. I just found the exceptional UCS videos, which deserved a re-share.


Part 1 – The Physical Architecture of UCS

In this video we take a look at the physical network architecture of Cisco UCS and incorporate the new capability of connecting both blade and rack mount servers to UCS Manager.


Part 2 – Infrastructure Virtualization & Logical Architecture

Here we look at how Cisco UCS virtualizes every significant component of the physical architecture; switches, cables, adapters, and servers. Then we look at how … Read more


I had a corrupted IOS image on a 3750E switch today and feared for a xmodem transfer to eat up my day, until I found that you can copy from TFTP. It’s very well hidden, but still possible. Here’s how:

When the switch has ‘booted’ without a proper IOS, you’ll be in the ‘switch: ‘ command line. In the following example, I will assume that the TFTP server has IP 192.168.0.10 and the switch will use 192.168.0.1.

Connect your TFTP server to the ethernet management port, then follow this sequence:

switch: set IP_ADDR 192.168.0.1/255.255.255.0
switch: set DEFAULT_ROUTER 192.168.0.10
switch: copy
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For some reason a Cisco ME3400 doesn’t have both IPv4 and IPv6 routing enabled. Still wondering why, but this is how you enable it:

 

conf t
sdm prefer dual-ipv4-and-ipv6 routing
exit
wr mem
reload
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