When using 2 core switches for load balance, should I be making only one of the them the RSTP root?

[Jimhinojosa]

When using 2 core switches, should I be making one of them the RSTP root? I would like both of them to get equal traffic. Right now all the switches are on the default method and it is saying one of the lower level switches is the root but no issues have arisen from this and traffic is being sent to both core switches evenenly.

[GreenMan · Accepted solution]

What switches are they?   Are they not configured as part of a stack?   If they are separate switches (not stacked) and one is made root, you will certainly not get load shared between them both.

If they are part of a stack then they behave as one switch, for Spanning Tree purposes, so you would configure the stack as the root bridge and you would uplink any remote switches (or stack) to both units and configure the two links as a single Aggregate Link:   https://documentation.meraki.com/MS/Port_and_VLAN_Configuration/Switch_Ports#Link_Aggregation

https://documentation.meraki.com/MS/Port_and_VLAN_Configuration/Configuring_Spanning_Tree_on_Meraki_...

[Jimhinojosa]

I just saw that it was accepting the core switches as a stack. That should take care of what I needed. Thank you

[GreenMan]

Bear in mind that, even if your core switches are a stack, uplinks will not loadshare unless you also configure them as aggregate links - otherwise a loop is formed, which Spanning Tree will resolve by blocking links.