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What do TOR, EOR and MOR mean?

Latest reply: Dec 14, 2018 08:01:32 7492 4 11 1

Hello there, Community friends!

This post explains what TOR, EOR and MOR mean, with reference to the layout of the data center switches. Please see below.


Literally, it is not difficult to understand. The TOR switch is deployed on the top of the cabinet. The servers in the cabinet are connected to the switch through optical fibers or network lines, and the switch is connected to the upper convergent switch. In this case, it is suitable for the situation of more access equipment or high density of single cabinet equipment. 

Through distributed access, the connection between server cabinet and network cabinet can be reduced, and the connection management is simple. But at the same time, access switches are scattered in multiple cabinets, which is not conducive to centralized maintenance and management of switches.


EOR refers to the centralized deployment of access switches in one or two cabinets at the end of each cabinet, where all servers are connected to the switch through horizontal routes. 

This situation is more common - by using EOR method to connect, there will be a large number of cable connections from multiple server cabinets converged into the network cabinet, connection management is difficult, but the centralized maintenance and management of switches is convenient.


The connection mode of MOR switch is similar to the EOR mode. Access switches are deployed in one or two cabinets of a cabinet group through the centralized mode. Only the location of the network cabinet is in the middle of the cabinet group. In this case, the connection between server cabinet and network cabinet will be simplified. 

At the same time, the switch has been centralized management, which is a compromise between TOR and EOR.

This would be what TOR, EOR and MOR mean.

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Created Dec 5, 2018 05:37:40 Helpful(0) Helpful(0)

learning it
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Created Dec 12, 2018 01:29:22 Helpful(0) Helpful(0)

Glamorous terms, easy to understand What do TOR, EOR and MOR mean?-2818759-1
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Created Dec 13, 2018 16:43:00 Helpful(0) Helpful(0)

Good post, with so many abbreviations it is easy to be confused.
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Created Dec 14, 2018 08:01:32 Helpful(0) Helpful(0)

hello author
it's a wonderful post , thank you .
if you can share more examples , will be better .
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