A method for port resource reservation comprising, receiving a request message for reserving a resource for traffic, wherein, the request message carries default priority information, and the request message is preset with a first field indicative of a mode for resource reservation and a second field indicative of an extended priority; the first field indicates that the reservation of the source is performed with a default mode or with the extended mode; and determining a mode for resource reservation according to the first field of the request message; in response to a determination that resource reservation is to be performed in the extended mode, acquiring, according to a predetermined first mapping relationship, an egress port queue corresponding to the extended priority carried in the request message, and performing resource reservation for the traffic on the egress port queue corresponding to the extended priority, wherein the first mapping relationship refers to a mapping relationship between the extended priority and the egress port queue; in response to a determination that resource reservation is to be performed with the default mode, acquiring, according to a transmission protocol on which the request message is based, an egress port queue corresponding to the default priority carried in the request message, and performing resource reservation for the traffic on the egress port queue corresponding to the default priority, wherein, the transmission protocol is the Stream Reservation Protocol, SRP; and acquiring a traffic identifier from the request message, and establishing a second mapping relationship, wherein the second mapping relationship refers to a mapping relationship between the traffic identifier and the extended priority. receiving a request message for reserving a resource for traffic, wherein, the request message carries default priority information, and the request message is preset with a first field indicative of a mode for resource reservation and a second field indicative of an extended priority; the first field indicates that the reservation of the source is performed with a default mode or with the extended mode; and determining a mode for resource reservation according to the first field of the request message; in response to a determination that resource reservation is to be performed in the extended mode, acquiring, according to a predetermined first mapping relationship, an egress port queue corresponding to the extended priority carried in the request message, and performing resource reservation for the traffic on the egress port queue corresponding to the extended priority, wherein the first mapping relationship refers to a mapping relationship between the extended priority and the egress port queue; in response to a determination that resource reservation is to be performed with the default mode, acquiring, according to a transmission protocol on which the request message is based, an egress port queue corresponding to the default priority carried in the request message, and performing resource reservation for the traffic on the egress port queue corresponding to the default priority, wherein, the transmission protocol is the Stream Reservation Protocol, SRP; and acquiring a traffic identifier from the request message, and establishing a second mapping relationship, wherein the second mapping relationship refers to a mapping relationship between the traffic identifier and the extended priority.