Cisco Archives - Page 4 of 4

Design Guide – Deploying VMware NSX with Cisco UCS and Nexus 7000

February 13, 2014 / Martijn / 1 Comment

VMware has released a design guide for a network with NSX, Cisco Nexus 7000 and Cisco UCS computing. Perhaps it’s a small glueing attempt from VMware to Cisco, maybe it’s nothing. The thing is, I’m really happy about this design guide, there’ll be a FlexPod for NSX yet! 😉

Read it here: http://www.vmware.com/files/pdf/products/nsx/vmware-nsx-on-cisco-n7kucs-design-guide.pdf

The document outlines a few important tips:

Use separate links for the routing between NSX and the Nexus switches. As you don’t want to route over vPC.
Use DVS network shares to prioritise your traffic.
Make sure your MTU values are set properly.

It’s a very good … Read more

Replacing the UCS Central SSL Certificate

November 24, 2013 / Martijn / 0 Comments

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

Nexus 5500: Changing Unified Ports on expansion module without reload

October 23, 2013 / Martijn / 0 Comments

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

UCS Explained in video

March 1, 2013 / Martijn / 0 Comments

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

IOS Recovery of 3750 switch

August 20, 2012 / Martijn / 0 Comments

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… Read more

Enabling IPv6 on a Cisco ME3400

August 27, 2011 / Martijn / 0 Comments

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