Traffic blackhole avoidance during ethernet virtual private network (EVPN) mac mobility

EP4758824A1Pending Publication Date: 2026-06-17TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
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Patent Information

Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Filing Date
2023-08-10
Publication Date
2026-06-17

AI Technical Summary

Technical Problem

Existing EVPN MAC mobility procedures can lead to traffic blackholing scenarios where traffic destined for a MAC address is sent to the incorrect PE, due to the selection of routes based on IP addresses when multiple PEs advertise the same MAC address with the same sequence number but different Ethernet segment identifiers.

Method used

A method is introduced where a network device functioning as a PE in an EVPN invalidates routes and removes entries from the MAC table when it receives route advertisements with the same MAC address and sequence number but different Ethernet segment identifiers, thereby preventing incorrect routing and ensuring traffic is sent as broadcast, unknown, unicast, or multicast until the correct route is established.

Benefits of technology

This solution effectively prevents traffic blackholing during MAC mobility by ensuring that traffic is correctly routed to the PE connected to the host's current Ethernet segment, thereby maintaining network reliability and minimizing disruptions.

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Abstract

A method performed by a first provider edge (PE) in an ethernet virtual private network (EVPN) is disclosed to handle media access control (MAC) mobility. The method includes receiving a first route advertisement message from a second PE, wherein the first route advertisement message includes a MAC address associated with a host, a first ethernet segment identifier (ESI), and a sequence number, receiving a second route advertisement message from a third PE, wherein the second route advertisement message includes the MAC address, a second ESI, and the same sequence number included in the first route advertisement message, and responsive to a determination that the route advertisement messages include the same MAC address and the same sequence number but include different ESIs, invalidating routes associated with the MAC address having the same sequence number and removing an entry for the MAC address from a MAC table.
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