I am working towards my CCNA and i have a question about root bridge priorities. Several references have conflicting guidance on setting the root bridge priority. Everyone agrees that the default is 32768 and if all are at default, the lowest MAC wins. When you lower the priority, can you use any number between 1 and 32768, or doess it have to be in blocks of 4096 ( 0, 4096, 8092, 12288, etc)? All help is appreciated.
Yes, that's what Cisco called "extended system id". You can only control the 4 upper bits of the priority fields, the others are the instance ID. When MST is used or when this extended system id feature is enabled, you can only configure the priority by increments of 4096. (some cat6k chassis have the feature enabled by default, with no option to disable it).
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...