Transmission device and label allocation method
AssigneeFujitsu Limited
InventorsAkira Nagata, Shinya Kanoh, Keiji Miyazaki
Life of this patent
Estimating the term…
Abstract
In a network having a main route and a protection route, a branch node reflects label limit information for the main route into the label limit information for the protection route, and allocates to the main route, a label related to the label for the protection route. On the other hand, a merge node reflects label limit information for the protection route into the label limit information for the main route, and allocates to the protection route, a label related to the label for the main route. Thus, labels having a relation can be allocated to the main route and the protection route.
Claims20
A transmission device that controls a route according to a label switching protocol, in a network having a main route and a protection route that protects the main route, comprising:
- an interface to send and receive messages;
- and
- a controller that determines a position of the transmission device in the network and reuses label limit information included in a connection establishment request message for the main route into label limit information of a connection establishment request message for the protection route that is sent to a next transmission device on the protection route, when the controller judges that the transmission device is positioned at a branch between the main route and the protection route.
A label allocation method performed by a transmission device in a network, where a main route and a protection route that protects the main route are established, and where route control is executed based on a label switching protocol, comprising:
- receiving a connection establishment request message for the main route from a previous transmission device on the main route;
- determining whether the transmission device is positioned at a branch between the main route and the protection route based on the connection establishment request message for the main route;
- reusing label limit information included in the connection establishment request message for the main route into label limit information included in a connection establishment request message for the protection route that is sent to a next transmission device on the protection route, if the transmission device is positioned at the branch;
- waiting for a connection establishment response message for the protection route that is sent from the next transmission device on the protection route, after receiving a connection establishment response message for the main route that is sent from a next transmission device on the main route corresponding to the connection establishment request message for the main route;
- acquiring label limit information allocated to the protection route, from the connection establishment response message for the protection route;
- and
- allocating, based on a relation between the main route and the protection route, a label to the label limit information acquired at the acquiring into the connection establishment response message for the main route that is sent to the previous transmission device on the main route.
A label allocation method performed by a transmission device in a network, where a main route and a protection route that protects the main route are established, and where route control is executed based on a label switching protocol, comprising:
- receiving a connection establishment request message for the main route from a previous transmission device on the main route;
- determining whether the transmission device is positioned at a merge between the main route and the protection route based on the connection establishment request message for the main route;
- waiting for a connection establishment request message for the protection route that is sent from a previous transmission device on the previous route, if the transmission device is positioned at the merge;
- reusing label limit information included in the connection establishment request message for the protection route into label limit information included in the connection establishment request message for the main route that is sent to a next transmission device on the main route;
- acquiring label limit information allocated to the main route from a connection establishment response message for the main route that is sent from the next transmission device on the main route, after waiting for the connection establishment response message for the main route;
- and
- allocating, based on a relation between the main route and the protection route, a label to the label limit information acquired at the acquiring into the connection establishment response message for the protection route that is sent to the previous transmission device on the protection route.
Dependencies are inferred from the claim text.