I've just tested it: the max_age of 20 seconds is not used on half duplex - or better said, shared links for RSTP neighbors. For them, the normal 6 second timeout applies.
I did a quick test: I have interconnected two switches by a crossover cable, forced the ports to half duplex, run the RSTP on both switches and made one to be the root bridge by lowering the priority to 0. On the second switch, I have turned on STP debugging and back on the root bridge, I have activated the BPDU Filter on its port towards the second switch. After 6 seconds, the second switch reported a loss of previous root and elected itself as a new root bridge.
So the max_age parameter seems to apply only to legacy 802.1D STP neighbors.
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...