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I want to stack two D-Link DGS 1510 with each other. Both of the switches already have a running config. My question is if one of the running configs will be used for the new stacked switch or that everything will be deleted?

Also will I be able to use both the ports of both switches?

  • Did any answer help you? If so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. Alternatively, you could provide and accept your own answer. – Ron Maupin Feb 21 '18 at 19:02
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While I'm not familiar with that specific switch, there's basically two or three scenarios:

  1. The switch configuration is wiped on both switches when you enable stacking.
  2. The switch configuration is preserved on the first, "master" switch when you enable stacking, and wiped on the following "slave" switches.
  3. The switch configuration is preserved after enabling stacking on both switches.

HP 2920 switches for example follow scenario 2, where the master switch configuration is preserved, but any slave switches get a complete wipe. This is quite logical, as the master switch stores the configuration for all switches in the stack, and as such has no configuration for the ports on the slave switches.

Another thing to keep in mind is if your switches are "true" stacking switches, or "pseudo-stacking". Most HP switches for example has a "stacking" feature, but it doesn't do much more than allow management from a singular IP for all the switches in the stack. The aforementioned 2920 series on the other hand has "true" stacking, where the switches in the stack behaves as a single switch. The easiest way to tell is if the stacked switches support for example an LCAP trunk spread over multiple chassis. Another good indicator is if the switches has a dedicated special stacking module and cables, instead of using just normal Ethernet interfaces for the stacking.

A more meta question, what are you trying to gain from stacking these D-Links?

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Looking at the manual, it seems the DGS-1510 support "true" stacking as outlined by @Stuggi.

Synchronization State – Once the Primary Master and the Backup Master have been established, the Primary Master will assign Stacking Unit IDs to switches in the stack, synchronize configurations for all switches and then transmit commands to the rest of the switches based on the users configurations of the Primary Master.

This very much sounds like the slaves are wiped and their configuration is copied from the master switch.

You can select which switch becomes master when configuring the stack. I'd strongly suggest that you read and understand the appropriate parts of the manual before attempting to activate stacking, especially when done outside a network lab.

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