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ESG |
DLR |
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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.
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- It’s a kernel module. - It splits in to two components.
- 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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