Category : 101

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Jumbo Frames and Network Virtualization Overlay Networks

In data networking, the standard Maximum Transmission Unit (MTU) for IP frames is 1500 Bytes. Jumbo Frames are MTU’s larger than 1500 Bytes although when we reference Jumbo Frames, we are normally referencing a Frame with an MTU of 9000 Bytes.

Network Virtualization and the addition of an overlay (encapsulation) networking technology (VXLAN, STT, GRE, Geneve) to the data center requires some consideration as to what MTU to use due to the overhead of overlay transport technologies.

VMware NSX using the overlay technology VXLAN requires an MTU of 100 bytes greater than the networks used for Virtual Machines – In a traditional data center using a 1500 byte MTU for virtual machines, this would require the use of a 1600 Byte MTU for the L2 or L3 network(s) associated with the overlay or NSX Transport network…

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Migration Tool for N1KV to vDS

VMware now has a beta migration tool to assist with the removal of N1KV from vSphere environments simplifying the path to NSX. The tool uses Python and Pyvmomi (Python SDK for VMware API)…

Currently validated with vSphere ESXi 5.1 with N1KV versions 2.2.3 and 1.5.2b and vSphere 5.5 and N1KV versions 3.1.3 and 2.2.3, but reach out to your faviorate VMware NSBU Systems Engineer for more information.

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NSX L2VPN within the Data Center

NSX Edge Services Gateways (ESGs) are deployed to perform various network functions (Network Function Virtualization) in an NSX environment.

ESG’s deployed configured for L2VPN provide Layer 2 network adjacency between data centers allowing VLANs – VLANs, VLANs – VXLANs, and VXLANs – VXLANs to be bridged across a Metro Area or Wide Area Network.

The primary use case for L2VPN Edge Services Gateways is Private Cloud to Private Cloud and Private Cloud to Public Cloud Layer 2 LAN/VXLAN extension, but they are also a useful tool for VM mobility within a data center…

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NSX and Virtual Machine Sprawl

During a recent customer discussion on NSX, I was asked about Virtual Machine sprawl in an NSX environment. This was a great question and cuts to the heart of Network Virtualization and how network functions are implemented in a virtualized environment…

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Stateful Firewall and NSX

One question that I get asked often is how NSX firewall state is maintained if you have a hypervisor based distributed firewall? The big difference in a distributed firewall vs a perimeter based firewall is that firewall execution has been moved from the perimeter of the network to the vNIC of the Virtual Machine…

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