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Proactive Fault Detection in E-VPN: Mechanisms and Solutions

This draft paper proposes fault detection mechanisms and solutions for E-VPN networks, addressing various tunnel types and scenarios to ensure correct operation of the data plane.

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Proactive Fault Detection in E-VPN: Mechanisms and Solutions

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  1. Proactive fault detection in E-VPN(draft-vgovindan-l2vpn-evpn-bfd-00) VengadaPrasad Govindan, Samer Salam, Ali Sajassi IETF 88, November 2013 Vancouver

  2. EVPN OAM Layering(draft-salam-l2vpn-evpn-oam-req-frmwk-01)

  3. EVPN OAM Mechanisms(draft-salam-l2vpn-evpn-oam-req-frmwk-01)

  4. EVPN Network Layer OAM • Visible to PE nodes • Analogous to VCCV (RFC 5085) • Provides mechanism to check correct operation of data plane, and to verify the data plane against control plane for following EVPN functions • MP2P tunnels used for transport of unicast traffic • MP2P tunnels used for aliasing unicast traffic • Multicast tunnels (P2MP & MP2P) for BUM traffic • ESI split-horizon filtering function • DF filtering mechanism

  5. Scope and Problem Definition • Proposal addresses fault detection by setting up BFD sessions for the following types of E-VPN tunnels: • MP2P tunnels created for Unicast. • Tunnels created for BUM traffic using: • Ingress replication: MP2P tunnels. • LSM : P2MP tunnels. • Problems to be addressed for setting up and maintaining BFD sessions for the E-VPN tunnel types: • Disambiguation of the source of the BFD session in MP2P tunnels used for unicast and ingress replication. • De-multiplexing the BFD session and identification of source of the BFD session in P2MP tunnels. • The solution proposal should NOT rely on the source IP as it may not be present when using GAL/ G-Ach encapsulations.

  6. Fault detection mechanisms -1/2 • Unicast (MP2P) E-VPN tunnels: • Use out-of-band BFD discriminator exchange using MPLS Ping [RFC5884]. • Use entropy labels for monitoring the multi-path network. • Ingress replication (MP2P) E-VPN tunnels: • BFD session bootstrapped on reception of Inclusive multicast route from the tail containing the downstream allocated BUM label. • Use out-of-band BFD discriminator exchange using MPLS Ping [RFC5884]. Note that the head makes an individual copy for each tail. Hence the BFD packet can be custom-built for each tail. • Use entropy labels for monitoring the multi-path network.

  7. Fault detection mechanisms -2/2 • LSM (P2MP) E-VPN tunnels: • P2MPBFD proposed in draft-ietf-multipoint-01 can be applied to LSM tunnels. • LSM label can be used to de-multiplex BFD sessions at the multicast tails since it uniquely identifies a source (P2MP head) and the P-Tunnel. BFD packets MUST use LSM label as yourDisc. • Use LSM label + Context label (upstream assigned) for Aggregate Inclusive Multicast trees.

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