From what I remember Dual Sups (Two sups for each chassis = 4 Total sups) on VSS wasn't supported yet. 1 Sup per chassis = 2 Total for VSS does work. From the product literature dual sups per chasss would be available in an upcoming release.
As for why IP Base doesn't support it? They want to make sure they're compensated for all the bells and whistles. IP Base is the most stripped down IOS you can run.
Last I checked, there doesn't seem to be redundant supervisor support with VSS. VSS is redundant with a completely separate chassis and sup module, so having 4 sups for two chassis (where it only acts as one) is a bit overkill. This breaks the traditional two sup per chassis model, however you have one switch with two sups already, they're just riding in different chassis.
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 customers befor...
Introduction Featured Speakers Luis Espejel is the Telecommunications
Manager of IENova, an Oil & Gas company. Currently he works with Cisco
IOS® and Cisco IOS XE platforms, and NX to some extent. He has also
worked as a Senior Engineer with the Routing P...
In this session you can learn more about Layer 3 multicast and the best
practices to identify possible threats and take security measures. It
provides an overview of basic multicast, the best security practices for
use of this technology, and recommendati...