A packet sending method, applied to a first provider edge, PE, node and characterized by comprising: receiving a first packet from an access circuit, AC; processing the first packet to obtain at least one second packet, wherein each of the at least one second packet comprises a first internet protocol, IP, address, wherein the first IP address comprises a second IP address; wherein the second IP address is one of the following: an Ethernet segment identifier, ESI, IP address of an ESI corresponding to the AC, an IP address which is obtained from a modification to a designated bit of the ESI IP address of the ESI corresponding to the AC according to a Root/Leaf attribute of the AC, an IP address which is obtained from replacement of part bits of the ESI IP address of the ESI corresponding to the AC with a virtual local area network identifier, VLAN ID, value corresponding to the AC, a third IP address, or an IP address which is obtained from a modification to a designated bit of the third IP address according to the Root/Leaf attribute of the AC; and wherein the ESI corresponding to the AC is an ESI bound to a main interface to which the AC belongs, the ESI IP address of the ESI is an IP address corresponding to the ESI, the VLAN ID value corresponding to the AC is configured in the AC and used for matching the first packet, and the third IP address is determined through a provider edge, PE, node where the AC is located and a local index of the ESI corresponding to the AC on the PE node; and sending each of the at least one second packet to a second PE node; wherein the processing the first packet to obtain at least one second packet comprises: performing an IP encapsulation on the first packet to obtain the at least one second packet, wherein the IP encapsulation comprises an A-type extended segment routing internet protocol version 6, SRv6, encapsulation, wherein the A-type extended SRv6 encapsulation does not have a UDP header and a VXLAN header compared to a virtual extensible local area network, VXLAN, encapsulation. receiving a first packet from an access circuit, AC; processing the first packet to obtain at least one second packet, wherein each of the at least one second packet comprises a first internet protocol, IP, address, wherein the first IP address comprises a second IP address; wherein the second IP address is one of the following: an Ethernet segment identifier, ESI, IP address of an ESI corresponding to the AC, an IP address which is obtained from a modification to a designated bit of the ESI IP address of the ESI corresponding to the AC according to a Root/Leaf attribute of the AC, an IP address which is obtained from replacement of part bits of the ESI IP address of the ESI corresponding to the AC with a virtual local area network identifier, VLAN ID, value corresponding to the AC, a third IP address, or an IP address which is obtained from a modification to a designated bit of the third IP address according to the Root/Leaf attribute of the AC; and wherein the ESI corresponding to the AC is an ESI bound to a main interface to which the AC belongs, the ESI IP address of the ESI is an IP address corresponding to the ESI, the VLAN ID value corresponding to the AC is configured in the AC and used for matching the first packet, and the third IP address is determined through a provider edge, PE, node where the AC is located and a local index of the ESI corresponding to the AC on the PE node; and an Ethernet segment identifier, ESI, IP address of an ESI corresponding to the AC, an IP address which is obtained from a modification to a designated bit of the ESI IP address of the ESI corresponding to the AC according to a Root/Leaf attribute of the AC, an IP address which is obtained from replacement of part bits of the ESI IP address of the ESI corresponding to the AC with a virtual local area network identifier, VLAN ID, value corresponding to the AC, a third IP address, or an IP address which is obtained from a modification to a designated bit of the third IP address according to the Root/Leaf attribute of the AC; and wherein the ESI corresponding to the AC is an ESI bound to a main interface to which the AC belongs, the ESI IP address of the ESI is an IP address corresponding to the ESI, the VLAN ID value corresponding to the AC is configured in the AC and used for matching the first packet, and the third IP address is determined through a provider edge, PE, node where the AC is located and a local index of the ESI corresponding to the AC on the PE node; and sending each of the at least one second packet to a second PE node; wherein the processing the first packet to obtain at least one second packet comprises: performing an IP encapsulation on the first packet to obtain the at least one second packet, wherein the IP encapsulation comprises an A-type extended segment routing internet protocol version 6, SRv6, encapsulation, wherein the A-type extended SRv6 encapsulation does not have a UDP header and a VXLAN header compared to a virtual extensible local area network, VXLAN, encapsulation.