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EVPN Multi-Homing Split-Horizon Filtering Extensions

This draft proposes Split-Horizon filtering extensions for EVPN Multi-Homing Split-Horizon mechanisms, focusing on EVPN NVO, ESI Label, and more. It discusses All-Active and Single-Active mode works for Inter-AS/domain communication and provides specifics on BUM designated forwarders, Local Bias filtering, and ESI Label-based filtering for network encapsulations. The draft covers the signaling of Split Horizon Type (SHT) using BGP EVPN extensions, ensuring compatibility with RFC8365. It also addresses advertising multiple encapsulations and SHT values for different scenarios.

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EVPN Multi-Homing Split-Horizon Filtering Extensions

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  1. draft-nr-bess-evpn-mh-split-horizon-00 EVPN Multi-HomingExtensionsfor Split HorizonFiltering Jorge Rabadan (Nokia) Kiran Nagaraj(Nokia) WenLin(Juniper) Ali Sajassi (Cisco) IETF104, Mar 2019 Prague

  2. In current specifications EVPN Multi-Homing Split-Horizon mechanisms EVPN NVO ESI Label SHT All-Active and Single-Active Works Inter-AS/domain PE1 PE2 Transp L2 EVI Lx IP1IP2 EVPN MPLS BD1 BD1 ESI L1 NVO Local Bias SHT All-Active only No Inter-AS/domain BUT: less resources, no extra labels, ingress NVE always forward locally PE1 PE2 BUM BUM DESIGNATED FORWARDER (ES-1 AND ES-2) BD1 BD1 BUM DESIGNATED FORWARDER (ES-1 AND ES-2) All-Active ES-2 All-Active ES-1 BUM BUM CE1 CE2 All-Active ES-2 All-Active ES-1 BUM CE1 CE2 RFC8365 Local Bias SH Filtering RFC7432 ESI Label based SH Filtering

  3. For network encapsulations that support both SHTs BGP EVPN extensions Signaling of the Split Horizon Type (SHT) Allows NVE/PEs attached to the same ES to agree on the SHT to be used in the ES. SHT is different than 00 only for tunnels that can support both SHTs Backwards compatibility with RFC8365: inconsistency in the ES reverts to the default SHT ESI Label extended community Advertised with A-D per ES route (type 1) 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type=0x06 | Sub-Type=0x01 |Flags (1 octet)| Reserved=0 | +---------------+---------------+-------------------------------+ | Reserved=0 | ESI Label | +---------------------------------------------------------------+ Flags Octet Bits: 0  Single-Active bit 7-6  SHT (Split Horizon Type) SHT bit 7 6 ----------- 0 0  Default SHT. Backwards compatible with [RFC8365] 0 1  Local Bias 1 0  ESI Label based filtering 1 1  reserved for future use NVEs supporting multiple encapsulations A-D per ES routes advertise multiple encapsulations and SHT=00 if at least one of the encaps support only one SHT • A-D per ES routes advertise multiple encapsulations and SHT≠00 if all encaps support both SHTs Different SHT may be signaled for the same ES in different A-D per ES routes for different groups of EVIs

  4. Next steps The Authors would like to request Feedback

  5. Thank you

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