EVPN Layer 2 Attributes Extended Community

RFC7432bis has defined the new "EVPN Layer 2 Attributes Extended Community," which allows for the control of Layer 2 Maximum Transmission Unit (MTU), Control Word (CW), and flow label.
In our test, we configured EVPN-VPWS as the overlay service and began advertising the Layer 2 Attributes Extended Community using BGP. Initially, all settings for CW, MTU, and flow control were matched, ensuring that the EVPN-VPWS service was operational. Subsequently, we intentionally configured mismatches for any of the three parameters to verify that the EVPN-VPWS service would go down. No traffic was sent during the entire test.
The results are as follows:
- Arista: CW, MTU
- Arrcus: CW, Flow label, MTU
- H3C: CW, Flow label, MTU
- Ribbon: MTU