I was aware that Iperf is a good enough tool to generate and measure multicast and unicast traffic but support for SSM was missing from current version. Fortunately there are always some developers which are interested in networking so one of them developed a special Iperf version 2.0.5 with SSM support.
The idea here is to show how to make this version of Iperf work on your Cent OS or similar Linux machine.
Here are few steps that should work from your Cent OS 6.8 Linux Server and hopefully from other similar distributions to:
In SSM, Source-Specific Multicast, things are done differently from standard multicast forwarding. SSM is specifying a group of hosts that are receiving same multicast stream using group IP address and additionally using stream unicast source IP.
In this article it is shown how to configure Source Specific Multicast on Cisco and Juniper equipment.
In standard multicast, forwarding is done using group IP address which is an IP from multicast dedicated range 220.127.116.11/4 (18.104.22.168 – 22.214.171.124) or FF00::/8 in IPv6. Each multicast group IP address is a single address which specifies all hosts receiving a specific stream, streamed towards that group IP address from multicast source. In standard multicast everybody can start to stream with some IP multicast group IP, becoming in that way, the multicast source.
Cisco spoiled us over the years with great and detailed documentation on each technology and hardware component they support. Still, I managed to find a part where documentation is not detailed enough to give you definite number of steps to get things done.
While preparing for software upgrade of Cisco Catalyst 6880-X VSS cluster I stumbled on one of the first examples of outdated and vague procedure for upgrade of Cisco device. Here is my successful ISSU (In-Service Software Upgrade) procedure which I done few days ago. I hope it will help you avoid sweating and hoping that you typed the right thing on a VSS cluster that should not go down at any point 🙂
I included an Acronym Guide at the bottom of the post to guide you trough VSS, ISSU, Cluster, and other mentioned abbreviation which are not described in details here
In my case the environment was Catalyst 6880-X and four 6800ia Fabric Extenders FEX. The same procedure is valid for more on for no FEX extenders.
Cisco Catalyst 6880-X VSS
Get the info on which IOS version is supported to be upgraded with ISSU
Not all IOS images can be upgraded to new IOS versions using In Service procedure to avoid network traffic downtime. In order to get things working, you need to get into Cisco docs and find ISSU supported upgrade matrix document.
As you can see from my article list, I’m going through some VRF configuration in the last few weeks 🙂
I raninto thistoday and it sounded interesting enough to share it with you. The issue with TFTP IOS image copy to flash when having all interfaces in specific VRF and no interface in Global Routing Table.
Long story short, you kick in this command for normal IOS download to the router: