Posts Tagged ‘n5k’

Nexus (NX-OS) protocol support (and cleanup)

Monday, March 29th, 2010

Over the years, Cisco has been very instrumental in the design and standardization of many networking protocols.  There are lots of examples where a need for a protocol was identified and Cisco filled the need with a Cisco-proprietary protocol.  Cisco-proprietary can sound bad, but it really isn’t.  Let’s give them some credit here – network equipment vendors are in competition and don’t typically play well together.  Often times vendors pitch proprietary solutions in an attempt to carve out a niche that delineates them from their competitors.

There are several standards organizations in existence today (IEEE, IETF, CableLabs, etc.) which many vendors work with and closely follow.  While this sounds ideal (and is very beneficial), standards often take a significant amount of time to be ratified, leaving any current needs unaddressed from a standards perspective.  The only alternative (for a quick resolution) is a proprietary solution, while the standards process is given time to complete. (more…)

FEX configs are retained

Monday, February 15th, 2010

The N5k maintains the config of the FEXs, even when they’re removed (and even though it’s not visible to us). In this article, we’re going to look into this a little further… We’ll start with a working FEX, using Po100 (with Eth1/19-20 being the physical bundle members). (more…)

Methods for connecting FEXs

Friday, January 29th, 2010

If you’re wondering what an FEX is, check out this article:

FEXs are connected to the parent switch(es) via fabric interfaces.  These are 10Gbps interfaces which connect the two switches (think of a stacking cable on a 3750-series switch).

There are two methods of configuring fabric interfaces:

  • Static pinning
  • EtherChannels

Although these are somewhat differentiated in some of the documentation, the static pinning looks almost the same as that used for EtherChannels.  The main difference is that static pinning uses physical interfaces, whereas EtherChannel uses a single Port-Channel interface for the fabric interface (there are some minor configuration differences and requirements as shown below).


A Primer on Some of the Differences Between IOS and NX-OS

Sunday, January 17th, 2010

There are many similarities between IOS and NX-OS, however there are some significant differences as well. Before delving further into this topic, here’s what I was working with: NX-OS 4.0(1a)N1(1) (Nexus 5000) and IOS 12.4(17). This article gives a brief summary of the some of the differences (and similarities) of NX-OS and IOS. (more…)