Cat 8000v – no features

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You have a Catalyst 8000v image and you are all excited because you want to test SRv6. You boot the image, go into the configuration mode and you see no configuration options. You go read the features included with the IOS once more and you see SRv6 in there, and on the box itself, you … Read more

Local Proxy ARP

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In order to show what local proxy ARP can do for you, we will leverage the port protection configuration within one single vlan. We would be in a situation when the hosts behind the protected ports would not be able to talk to each other. But what if you really want to look at that … Read more

Port Protection (switchport protected)

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We will look at the simplest way to prevent a switch port from talking to another. For something that gives you more options, take a look at private vlans. It is all about one command under the switch port and that is: ‘switchport protected ‘. We have a L3 switch (in the middle) that has … Read more

Private VLANs

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On this post we will be discussing private vlans. What do they do / provide? – improved security – more granular network segmentation that leads to a even smaller broadcast domain Where would you use it? – hotel rooms – conference rooms How it works? You have 2 types of vlans : – Primary vlan … Read more

Cisco 9000v – listing the mac address table

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When you run the ‘show mac address-table dynamic’ command the Nexus is not showing anything. The command to run is: ‘show system internal l2fwder mac’ to list the mac entries. If you want to clear the mac entries, use the command: ‘clear mac address-table datapath dynamic’. Links: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/7-x/nx-osv/configuration/guide/b_Cisco_Nexus_9000v/b_Cisco_Nexus_9000v_chapter_011.html#concept_CFB4F9FC4EF04A86835CF9C64C4EB8A4 https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/7-x/nx-osv/configuration/guide/b_Cisco_Nexus_9000v/b_NX-OSv_9000_chapter_010.html