EVPN packet processing method, device, and system for MAC learning via MAC/IP advertisement route

A first provider edge (PE) device in an Ethernet virtual private network (EVPN) in which a customer edge (CE) device is connected to a first interface of the first PE device over a first link, wherein the CE device is connected to a second interface of a second PE device over a second link, and wherein the first PE device comprises:

• a receiver configured to receive a first message from the second PE device, wherein the first message carries a first media access control/Internet Protocol (MAC/IP) advertisement route, wherein the first MAC/IP advertisement route comprises a first MAC address and an Ethernet segment identifier (ESI) to identify an Ethernet segment (ES), wherein the first MAC address is of the CE device or of a terminal device managed by the CE device, and wherein the ES comprises the first link and the second link;
• a processor coupled to the receiver;
• and
• a memory storing a program comprising instructions to be executed in the processor such that when executed, cause the first PE device to:
• generate, based on the first MAC/IP advertisement route, a first MAC forwarding entry comprising an outbound interface identifier identifying the first interface and the first MAC address;
• and
• use the first MAC forwarding entry to forward, to the CE device, a packet whose destination MAC address is the first MAC address.

A non-transitory computer medium applied to an Ethernet virtual private network (EVPN) in which a customer edge (CE) device is connected to a first interface of a first provider edge (PE) device over a first link, wherein the CE device is connected to a second interface of a second PE device over a second link, and wherein the non-transitory computer medium stores instructions executable by a processor of the first PE device such that when executed, cause the first PE device to implement a method comprising:

• receiving a first message from the second PE device, wherein the first message carries a first media access control/Internet Protocol (MAC/IP) advertisement route, wherein the first MAC/IP advertisement route comprises a first MAC address and an Ethernet segment identifier (ESI) to identify an Ethernet segment (ES), wherein the first MAC address is of the CE device or of a terminal device managed by the CE device, and wherein the ES comprises the first link and the second link;
• generating, based on the first MAC/IP advertisement route, a first MAC forwarding entry comprising an outbound interface identifier identifying the first interface and the first MAC address;
• and
• using the first MAC forwarding entry to forward, to the CE device, a packet whose destination MAC address is the first MAC address.

A system applied to an Ethernet virtual private network (EVPN), the system comprising:

• a customer edge (CE) device;
• a first provider edge (PE) device comprising a first interface connected to the CE device over a first link;
• and
• a second PE device comprising a second interface connected to the CE device over a second link,
• wherein the first PE device comprises:
• a receiver configured to receive a first message from the second PE device, wherein the first message carries a first media access control/Internet Protocol (MAC/IP) advertisement route, wherein the first MAC/IP advertisement route comprises a first MAC address and an Ethernet segment identifier (ESI) to identify an Ethernet segment (ES), wherein the first MAC address is of the CE device or of a terminal device managed by the CE device, and wherein the ES comprises the first link and the second link;
• a processor coupled to the receiver;
• and
• a memory storing instructions to be executed by the processor such that when executed, cause the first PE device to:
• generate, based on the first MAC/IP advertisement route, a first MAC forwarding entry comprising an outbound interface identifier identifying the first interface and the first MAC address;
• and
• use the first MAC forwarding entry to forward, to the CE device, a packet whose destination MAC address is the first MAC address.