Question

A service provider runs an EVPN-based L2VPN across its IOS XR core. A dual-homed customer VM is migrated from a server behind PE1 to a server behind PE2. After the move, PE1 continues to advertise the VM's MAC as a local route while PE2 also advertises the same MAC, causing intermittent Layer 2 reachability and MAC flapping between the two PEs. Which EVPN mechanism resolves this by determining which PE currently owns the MAC?

Accepted Answer

The MAC Mobility extended community carrying an incrementing sequence number in the Type 2 MAC/IP advertisement route

Answer

The Ethernet Segment Identifier (ESI) label exchanged in the Type 4 Ethernet Segment route

Answer

The split-horizon group applied to the pseudowire to suppress duplicate flooding

Answer

The designated forwarder election performed via the Type 3 Inclusive Multicast Ethernet Tag route