It is well known that VXLAN supports bridging frames, that is, forwarding frames that belong to the same L2 segment. In the beginning, this is all that was supported. There was no VXLAN routing. In essence, the HW didn’t support
EVPN Terminology
Reading RFCs is a great source of information for understanding all the details of a protocol. Often they do require the reader to be quite technical and the terminology can be confusing if you aren’t used to the type of
Bridging Packet Walk In VXLAN/EVPN Network
In this post I walk you through all the steps and packets involved in two hosts communicating over a L2 VNI in a VXLAN/EVPN network. The topology below is the one we will be using: The lab has the following
Why Is BFD More Light Weight Than Routing Hellos?
There are many articles on BFD. It is well known that BFD has the following advantages over routing protocol hellos/keepalives: What does light weight mean, though? Does it mean that the packets are smaller? Let’s compare a BFD packet to
Catalyst SD-WAN Enhanced Application Aware Routing
Traditionally, Cisco has leveraged BFD to monitor tunnels and their performance and Application Aware Routing (AAR) to reroute traffic. BFD has been used to measure: Additionally, BFD is also used to verify liveliness of the tunnels. This works well, but
Catalyst SD-WAN 20.13 – RBAC
Catalyst SD-WAN has supported Role Based Access Control (RBAC) for a long time. It has been possible to use predefined roles or create custom roles and defining what areas the user should have access to. However, before 20.13 it was
NX-OS Forwarding Constructs For VXLAN/EVPN
In this post we will look at the forwarding constructs in NX-OS in the context of VXLAN and EVPN. Having knowledge of the forwarding constructs helps both with understanding of the protocols, but also to assist in troubleshooting. BRKDCN-3040 from
EVPN Route Type 5
In a previous post, EVPN Deepdive Route Types 2 and 3, I covered route types 2 and 3. In this post I’ll cover route type 5 which is used for advertising IP prefixes. This route type is covered in RFC
Simulate a Silent Host in a VXLAN Network
I’m working on a blog post explaining route type 5 in EVPN. To demonstrate a scenario with a silent host, I want to simulate this behavior. Normally, hosts can be quite chatty and ARP for their GW, for example. In
VXLAN/EVPN – Host routing
In an previous post Advertising IPs In EVPN Route Type 2, I described use cases for advertising IP addresses in EVPN route type 2. Host ARP and host mobility I already covered so today we will focus on host routing.