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3.1 |
7 |
In big and complex networks, there are multiple transport domains, different devices, different services, and different link types. All these differentiations need to have some parameters for negotiations. draft-ietf-bess-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. It helps MTU negotiation between networks, frame ordering, and increasing entropy for load-balancing accordingly. |
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8 |
In our test, we configured EVPN-VPWS as the overlay service and began advertising the Layer 2 Attributes Extended Community using BGP. Initially, all CW, MTU, and flow label settings 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 generated during the entire test. |
