**To update a virtual router** The following ``update-virtual-router`` example uses a JSON input file to update a virtual router listener port. :: aws appmesh update-virtual-router \ --cli-input-json file://update-virtual-router.json Contents of ``update-virtual-router.json``:: { "meshName": "app1", "spec": { "listeners": [ { "portMapping": { "port": 8080, "protocol": "http" } } ] }, "virtualRouterName": "vrServiceB" } Output:: { "virtualRouter": { "meshName": "app1", "metadata": { "arn": "arn:aws:appmesh:us-east-1:123456789012:mesh/app1/virtualRouter/vrServiceB", "createdAt": 1563810546.59, "lastUpdatedAt": 1563819431.352, "uid": "a1b2c3d4-5678-90ab-cdef-11111EXAMPLE", "version": 2 }, "spec": { "listeners": [ { "portMapping": { "port": 8080, "protocol": "http" } } ] }, "status": { "status": "ACTIVE" }, "virtualRouterName": "vrServiceB" } } For more information, see `Virtual Routers <https://docs.aws.amazon.com/app-mesh/latest/userguide/virtual_routers.html>`__ in the *AWS App Mesh User Guide*.