I do not know if they still stick to it but it goes like this:
In a dual-core environment like yours, you can divide the load by setting up HSRP to be active on half the valns (lets say even vlans) on one side and the odd ones on the other.
The STP root should be there where the HSRP-active interface resides, hence also on a 50-50 basis.
As a genuine cisco-adept I have in fact built several networks according to these guidelines. What happened then was that users (administrators!) found this environment complex to manage. Especially troubleshooting was found complex due to the split STP.
After giving it some thought, it was decided to modify the system in such a way that one switch has all HSRP-active nodes AND is the stp root for all vlans. In the real world this setup performs just as good as the design with load balancing. My own impression is that it is perhaps even a bit more stable and it has less traffic over the backbonelink interconnecting the switches.
Perhaps the networks that I have done so far are simply too small? ;-)
A well known person has said it all in just one sentence: Everything is relative.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...