Cisco CCNP Data Center SPAN

There is one topic you need to know for sure and that is SPAN. But SPAN where? Well, everywhere! I would know the SPAN config (and options) for the following:

  • IOS
  • NX-OS

OK, OK, maybe the IOS is a bit of a stretch, but I wanted to include it here for my readers.

A Peek Into SkyNet!

Remember, the Switched Port Analyzer feature is necessary because when we are wanting to do packet captures in the switched infrastructure, the switches will do their jobs and keep us from seeing frames that do not need to be sent to our switch port (with the analyzer). This is the filtering that switches do so well (unlike those stupid hubs).

Notice that while there is variation in the syntax – there is an overall consistency in the approach. It is all about setting the source port(s) correctly and the destination port. As you will see in the NX-OS and UCS examples, the destination port often holds the “bells and whistles” of the configuration.

NOTE: I think it will help if I present the source and destination configurations separated as you will see. This should allow us to really focus on each.

First, an IOS example:


Switch(config)# monitor session 1 source interface gigabitethernet0/1


Switch(config)# monitor session 1 destination interface gigabitethernet0/2 encapsulation replicate

Here is the NX-OS example:


switch(config)# monitor session 3
switch(config-monitor)# source interface ethernet 2/1-3, ethernet 3/1 rx
switch(config-monitor)# source interface port-channel 2
switch(config-monitor)# source interface sup-eth 0 both
switch(config-monitor)# source vlan 3, 6-8 tx
switch(config-monitor)# source interface ethernet 101/1/1-3
switch(config-monitor)# filter vlan 3-5, 7
switch(config-monitor)# exit

NOTE: The keywords for direction are tx, rx, and both


switch(config-monitor)# destination interface ethernet 2/5
switch(config-monitor)# no shut
switch(config-monitor)# mtu 500
switch(config-monitor)# rate-limit 10
switch(config-monitor)# multicast best-effort
switch(config-monitor)# exit

Here is the UCS CLI example:


UCS-A# scope eth-traffic-mon
UCS-A /eth-traffic-mon # scope fabric a
UCS-A /eth-traffic-mon/fabric # create eth-mon-session EthMonitor33


UCS-A /eth-traffic-mon/fabric/eth-mon-session*# create dest-interface 2 12
UCS-A /eth-traffic-mon/fabric/eth-mon-session/dest-interface*# set speed 20gbps
UCS-A /eth-traffic-mon/fabric/eth-mon-session/dest-interface*# commit-buffer

Thanks so much for reading! Oh – and you might want some more info on the UCS config, which is certainly the most interesting. Here is the relevant Cert Guide:

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What’s New in Tech! 11/26/2020

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Operating Systems

Microsoft Provides Hope for Many with Free Online Digital Skill Courses

Microsoft has committed to helping with this urgent situation of the COVID-19 pandemic. On June 30, Microsoft launched a major initiative to offer free digital skills classes with the goal of helping train 25 million people for new or improved jobs by the end of the year.

Four months into the skills initiative, the company has given training to more than 13 million people, partly by partnering with nonprofit organizations that help job seekers. To increase momentum, Microsoft is giving $20 million in cash grants to such nonprofits around the globe, along with $5 million to groups that focus on helping Black and African American people in the U.S.


New Social Media App Parler Tops App Store Charts

A social media platform that bills itself as a “non-biased, free speech” alternative to outfits like Twitter and Facebook has seen a surge in interest in its mobile app over the last week that culminated Sunday in it becoming the top free app at the Apple App Store. According to Fox Business, the Parler app has been downloaded 310,000 times in the last week alone.


AWS Adds a New Gateway Load Balancer Service

Amazon Web Services (AWS) has launched AWS Gateway Load Balancer (GWLB), a new product which aims to ensure high availability and scalability for network appliances.

The product ‘makes it easy and cost-effective to deploy, scale and manage the availability of third-party virtual appliances such as firewalls, intrusion detection and prevention systems, and deep packet inspection systems in the cloud’, according to the company. Channy Yun, the principal developer advocate for AWS, added that GWLB will have the same benefits for custom appliances, such as data analytics, telecoms, and IoT among others.


Cisco Earnings Report Might Represent a Turning Point

Certainly what Cisco needed at this point – better than expected results for the quarter, and a strong forecast. Shares of the stock jumped on the news 8%.

“Cisco is off to a solid start in fiscal 2021 and we are encouraged by the signs of improvement in our business as we continue to navigate the pandemic and other macro uncertainties,” said Chuck Robbins, chairman and CEO of Cisco. “Our focus is on winning with a differentiated innovative portfolio, long-term growth and being a trusted technology partner offering choice and flexibility to our customers.  We see many great opportunities ahead as every company in every industry is accelerating its digital-first strategy.”