A network path measurement method, comprising: obtaining , by a first switching node (A 1.1 ), which is part of a virtual switching node at an ingress stage of a Clos switching network, a first aggregate available bandwidth of a path from the first switching node to a second switching node (A 2.1 ), wherein the second switching node forms part of a virtual switching node at the egress stage of the Clos switching network, wherein the first aggregate available bandwidth is an aggregate available bandwidth of all paths from the first switching node to the second switching node; obtaining , by the first switching node, a first available bandwidth of a path from a first target port of a third switching node (T 1.1 ) to the first switching node, wherein the third switching node is a node of a previous stage of a first virtual switching node and wherein the first and third switching node are part of the first virtual switching node that is a two-stage Clos switching network; obtaining , by the first switching node, a second available bandwidth of a path from the second switching node to a fourth switching node (T 2.1 ), wherein the fourth switching node is a node of a next stage of a second virtual switching node and wherein the second and fourth switching nodes are part of the second virtual switching node that is a two-stage Clos switching network; and determining , by the first switching node, a second aggregate available bandwidth of a path from the first target port of the third switching node to the fourth switching node, wherein the second aggregate available bandwidth is a smallest available bandwidth among the first aggregate available bandwidth, the first available bandwidth, and the second available bandwidth. obtaining , by a first switching node (A 1.1 ), which is part of a virtual switching node at an ingress stage of a Clos switching network, a first aggregate available bandwidth of a path from the first switching node to a second switching node (A 2.1 ), wherein the second switching node forms part of a virtual switching node at the egress stage of the Clos switching network, wherein the first aggregate available bandwidth is an aggregate available bandwidth of all paths from the first switching node to the second switching node; obtaining , by the first switching node, a first available bandwidth of a path from a first target port of a third switching node (T 1.1 ) to the first switching node, wherein the third switching node is a node of a previous stage of a first virtual switching node and wherein the first and third switching node are part of the first virtual switching node that is a two-stage Clos switching network; obtaining , by the first switching node, a second available bandwidth of a path from the second switching node to a fourth switching node (T 2.1 ), wherein the fourth switching node is a node of a next stage of a second virtual switching node and wherein the second and fourth switching nodes are part of the second virtual switching node that is a two-stage Clos switching network; and determining , by the first switching node, a second aggregate available bandwidth of a path from the first target port of the third switching node to the fourth switching node, wherein the second aggregate available bandwidth is a smallest available bandwidth among the first aggregate available bandwidth, the first available bandwidth, and the second available bandwidth. <EOS>