VXLAN GPE Extension for Packets Exchange Between Control and User Plane of vBNG Lu Huang, China Mobile Shujun Hu, China Mobile Michael Wang, Huawei Ting Ao, ZTE

Problem to be addressed For China Mobile’s metro network evolution, we choose to separate control plane and user plane of the traditional BNG ( Broadband Network Gateway, or called BRAS, Broadband Remote Access Server) BNG-CP BNG-UP Service Interface Traditional BNG Between BNG-CP and UP, service interface is used to transmit PPPoE/IPoE authentication packets from UP to CP. We prefer to use VxLAN to encapsulate user’s packets. Furthermore, user’s port information on BNG-UP should be reported to BRAS-CP For TE, TS, LB, we need the BGP community information of a specific flow. We usually design several communities for one AS. BRAS-CP VxLAN No standard way for carrying port information in VxLAN header PPPoE BRAS-UP PPPoE Port information includes: device ID, slot ID, subcard ID, port ID User

ifIndex ( 32bit, speified in [RFC2863]) Proposed solution Extend VxLAN-GPE header to meet the requirement because it seems leverage the flexibility and complexity. Flag Reserved New Next protocol = vBNG service header VNI Next protocol Node ID Slot ID Subcard ID Port ID Port type VXLAN GPE Header vBNG Service Header An optional format for port information For TE, TS, LB, we need the BGP community information of a specific flow. We usually design several communities for one AS. Flag Next protocol Reserved Node ID ifIndex ( 32bit, speified in [RFC2863]) It’s a standard way to indicate a port/interface. But it can’t explicitly show the port’s location. CP should maintain a mapping table between ifIndex and physical port exactly same as UP. Should define a way to generate this table, UP or CP make the decision? It’s relatively more complex than the explicit way

Example of PPPoE dialup process For TE, TS, LB, we need the BGP community information of a specific flow. We usually design several communities for one AS.

Next Steps Welcome your comments and suggestions Request for WG adoption For TE, TS, LB, we need the BGP community information of a specific flow. We usually design several communities for one AS.

Thanks