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Multi-homing in EVPN with Inter-AS Option B draft-heitz-bess-evpn-optionb-00

Learn about multi-homing scenarios in EVPN with Inter-AS Option B, addressing failure scenarios and solutions for optimal network performance.

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Multi-homing in EVPN with Inter-AS Option B draft-heitz-bess-evpn-optionb-00

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  1. Multi-homing in EVPN with Inter-AS Option Bdraft-heitz-bess-evpn-optionb-00 IETF 96, July 2016 Berlin Jakob Heitz (Cisco) Ali Sajassi (Cisco) John Drake (Juniper) Jorge Rabadan (Nokia)

  2. Intra-AS ASN=1 MAC route|RD=1.1.1.1:21|NH=1.1.1.1 Egress PE1 EAD per EVI route|RD=1.1.1.1:21|NH=1.1.1.1 NH=1.1.1.1 EAD per ES route |RD=1.1.1.1:41|NH=1.1.1.1 CE Ingress PE3 EAD per EVI route|RD=1.1.1.2:22|NH=1.1.1.2 EAD per ES route |RD=1.1.1.2:42|NH=1.1.1.2 Egress PE2 NH=1.1.1.2 draft-heitz-bess-evpn-optionb-00

  3. Intra-AS Same Next-Hop. Mass withdraw ASN=1 ES fails MAC route|RD=1.1.1.1:21|NH=1.1.1.1 Egress PE1 EAD per EVI route|RD=1.1.1.1:21|NH=1.1.1.1 NH=1.1.1.1 EAD per ES route |RD=1.1.1.1:41|NH=1.1.1.1 CE Ingress PE3 Withdraw per ES EAD per EVI route|RD=1.1.1.2:22|NH=1.1.1.2 EAD per ES route |RD=1.1.1.2:42|NH=1.1.1.2 Egress PE2 NH=1.1.1.2 draft-heitz-bess-evpn-optionb-00

  4. Intra-AS ASN=1 MAC route|RD=1.1.1.1:21|NH=1.1.1.1 Egress PE1 EAD per EVI route|RD=1.1.1.1:21|NH=1.1.1.1 NH=1.1.1.1 EAD per ES route |RD=1.1.1.1:41|NH=1.1.1.1 CE Ingress PE3 Same Next-Hop. Mass withdraw EAD per EVI route|RD=1.1.1.2:22|NH=1.1.1.2 ES fails EAD per ES route |RD=1.1.1.2:42|NH=1.1.1.2 Egress PE2 NH=1.1.1.2 Withdraw per ES draft-heitz-bess-evpn-optionb-00

  5. Inter-AS Option B Same next-hop ASN=1 ASN=2 MAC route|RD=1.1.1.1:21|NH=2.1.1.1 Egress PE1 EAD per EVI route|RD=1.1.1.1:21|NH=2.1.1.1 NH=1.1.1.1 EAD per ES route |RD=1.1.1.1:41|NH=2.1.1.1 CE Ingress PE3 ASBR1 ASBR2 NH=2.1.1.1 EAD per EVI route|RD=1.1.1.2:22|NH=2.1.1.1 EAD per ES route |RD=1.1.1.2:42|NH=2.1.1.1 Egress PE2 NH=1.1.1.2 draft-heitz-bess-evpn-optionb-00

  6. EAD per ES route cannot be associated ASN=1 ASN=2 ES fails MAC route|RD=1.1.1.1:21|NH=2.1.1.1 Egress PE1 EAD per EVI route|RD=1.1.1.1:21|NH=2.1.1.1 NH=1.1.1.1 EAD per ES route |RD=1.1.1.1:41|NH=2.1.1.1 CE Ingress PE3 ASBR1 ASBR2 Withdraw per ES NH=2.1.1.1 EAD per EVI route|RD=1.1.1.2:22|NH=2.1.1.1 EAD per ES route |RD=1.1.1.2:42|NH=2.1.1.1 Rule: Mass Withdraw must not occur until all EAD per ES routes with a matching nexthop are withdrawn Egress PE2 NH=1.1.1.2 Same next-hop. Which one failed? draft-heitz-bess-evpn-optionb-00

  7. Mass Withdraw per EVI Same RD. Mass Wdr the MAC ASN=1 ASN=2 MAC route|RD=1.1.1.1:21|NH=2.1.1.1 Withdraw per EVI Egress PE1 EAD per EVIroute|RD=1.1.1.1:21|NH=2.1.1.1 NH=1.1.1.1 EAD per ES route |RD=1.1.1.1:41|NH=2.1.1.1 CE Ingress PE3 ASBR1 ASBR2 NH=2.1.1.1 EAD per EVI route|RD=1.1.1.2:22|NH=2.1.1.1 EAD per ES route |RD=1.1.1.2:42|NH=2.1.1.1 EAD per EVI is optional. If it never existed, then no mass withdrawal occurs. Egress PE2 NH=1.1.1.2 draft-heitz-bess-evpn-optionb-00

  8. Solution: PE of Origin ASN=1 ASN=2 MAC route|RD=1.1.1.1:21|NH=2.1.1.1|PEO=1.1.1.1 ASBR1 adds PEO. Copies NH+ASN into tunnel encap attribute Egress PE1 EAD per EVI route|RD=1.1.1.1:21|NH=2.1.1.1|PEO=1.1.1.1 NH=1.1.1.1 EAD per ES route |RD=1.1.1.1:41|NH=2.1.1.1|PEO=1.1.1.1 CE Ingress PE3 ASBR1 ASBR2 NH=2.1.1.1 EAD per EVI route|RD=1.1.1.2:22|NH=2.1.1.1|PEO=1.1.1.2 EAD per ES route |RD=1.1.1.2:42|NH=2.1.1.1|PEO=1.1.1.2 Egress PE2 NH=1.1.1.2 draft-heitz-bess-evpn-optionb-00

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