Simple MSTP question

RouterOS General
1

Hello, tried to search but the answer was not clear;
for a router with a single bridge and multiple VLANs (vlan-filtering=yes) is MSTP useful? Or RSTP is enough?
A switch with VLAN will be added in the future, this should have the same setting on the bridge?

Thanks

2

MSTP is useful if you need to connect Mikrotik to a switch of another brand, or if you have a topology where the spanning trees should be independent for different groups of VLANs (e.g. in “all good” state, each group of VLANs should use another physical link).

3

THANK YOU!
Just as confirmation, is this example (sorry not very precise) correct?

4

I do not understand the example. You cannot have a Y-shaped cable with Ethernet. If you connect two bridges using two trunk links:

  • with RSTP, all VLANs will use only one of the links and the other one will be blocked
  • with MSTP, you can have one group of VLANs prefer one of the links and the other group prefer the other link

In both cases, all VLANs must be permitted on both links, as if one of the links fails, all the VLANs will use the remaining one.