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. <EOS>