Any word on if / when this is coming? Frankly, I haven't bought a CCR2004 yet, so maybe it's there but undocumented. The CCR2004 is already running 802.1br in CB mode based on the block diagram (as others brought up in a thread last summer). It seems like a killer feature to be able to deploy a 1000 port "router". Yes, there are a lot of bad use cases, but a couple particularly good ones too.

TL:DR: I reclassified my application as "a stupid idea". Still find the concept academically interesting, just have trouble seeing actually choosing to deploy it in prod.

Excuse the bump, but I thought I'd wrap at least my little story on this front.
Thinking it through, I couldn't really justify running 802.1br on the CCR2004 vs CRS317. Going a bit further, I was designing out control mechanisms for config updates and really started to question the whole idea. If I'm pursuing automated config generation and deployment, concatenating all the switches to a single blast radius "device" is really hard to justify.

Thought I'd wrap up.
I was again possessed by this thought, and had a go now that we have a small set of ccr2004's around. No dice. No warning while I was entering the config, but when I did an export after the fact, handy little note:

/interface bridge port-controller
# no hw support

Whole thing makes sense. It'd be something of a custom implementation to let the CCR2004 do it.