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VMware NSX Notes - ESG vs DLR
By Pranay Jha | May 29, 2019 | In Articles | Total Views [ 2375 ]
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-        It’s always a VM.

-        We use ESG for North-South. It means, going outside from datacenter towards the external network or internet.

-        If you have logical switches in different transport zone, then you can use ESG.

-        ESG is for different transport zone, but DLR is for same transport zone.

-        It supports dynamic routing as well as static routing.

-        It supports OSPF and BGP.

-        It supports both the routing protocol at the same time.

-        It is for centralized routing.

-        Since it is a VM, so it can have maximum of 10 interfaces.

-        On one interface, we can have maximum 200 sub-interfaces which will be connected as trunk interface.

-        ESG has internal interface which connects with South. Means, it connects to DLR. (Transit Network).

-        Physical router will be Uplink interface.



-        It’s a kernel module.

-        It splits in to two components.

  1. DLR
  2. DLR Control VM

-        Name of DLR kernel module is nsx-vdrb. It exists on each ESXi hosts.

-        We use DLR for East-West routing. Means, routing within your datacenter.

-        Benefits of using DLR: -

-        If we remove DLR, so where we have router? We have router on each ESXi host.

-        DLR only do routing if logical switches are in same transport zone.

-        When we deploy DLR, it activates on those ESXi host which participate in that transport zone.

-        It supports dynamic routing as well as static routing.

-        It supports OSPF or BGP.

-        It doesn’t support both routing protocol at the same time.

-        It is distributed routing.

-        It has two interfaces as Internal and Uplink. And third uplink is related to management. Total 1000 interfaces.

-        Internal Interface

-        It connects towards the south. With Logical switches.

-        Maximum it can have 991 interfaces.

-        Uplink Interface

-        It connects with either physical router or ESG.

-        Maximum it can have 8 uplinks

-        Management Interface

-        Number of interfaces is 1

-        Total 10000 interface can be on single host.

-        When we talk about cloud then we give one DLR to each tenant. Where they can create logical switches and connect to DLR.

-        Maximum 250 DLR can be on single ESXi host.



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Pranay Jha
Pranay Jha
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Thank you for visiting my profile. I am Pranay Jha, bring along a total of 11+ years of extensive experience with me in Information Technology sector for organizations from small business to large enterprises, wherein my current assignment I am associated with IBM as a Technical Solution Architect for Virtualization platform. I am vExpert x 3 (16/17/18), VCIX-DCV, VCAP5/6-DCD, VCAP5-DCA, VCP7-CMA, VCP5/6-DCV, VCA-DCV, VCA-Cloud, VSP, VCE-CIA, MCITP, MCSE, MCSA(Messaging). I am also an Independent blogger and founder of and I can be reached via email at or Direct Message via Contact Us form.

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