A method and device for transmitting BFD message when detecting LSP through BFD
A packet and label detection technology, which is applied in the communication field, can solve the problems of failure of the active/standby switchover function of LSP, waste of BFD sessions, and reduce the utilization rate of BFD sessions of egress nodes, so as to improve the utilization rate and simplify the interaction process
Active Publication Date: 2016-06-08
XINHUASAN INFORMATION TECH CO LTD
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Problems solved by technology
[0008] However, when the Ingress node needs to perform BFD detection on a large number of LSPs between itself and the Egress node, the Egress node needs to establish a large number of BFD sessions, and the source IP addresses of these BFD sessions are all the IP addresses of the Egress node, and the destination IP addresses are all Ingress nodes. The IP address of the node, and the egress node will send BFD control packets to the ingress node according to the same destination IP address, and these BFD control packets may take the same forwarding path to the ingress node, thus causing the BFD session to be broken on the egress node A lot of waste, and reduce the BFD session utilization of egress nodes
[0009] Furthermore, when the Ingress node has a primary LSP and a backup LSP, the Egress node will establish a BFD session for the primary LSP and a BFD session for the backup LSP, and the source IP and destination IP of the two BFD sessions are the same; The BFD control packet sent by the node will reach the Ingress node through the same forwarding path. Once the forwarding path fails, BFD will cause both the active LSP and the standby LSP to report a DOWN event, which will cause the LSP active-standby switchover function to fail.
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[0034] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0035]The present invention proposes a method for transmitting a BFD message when detecting an LSP through BFD. The method is applied in an MPLS network including at least an Ingress node and an Egress node, and there is at least one network device (such as a router) between the Ingress node and the Egress node. etc.); it should be noted that there is an LSP between the Ingress node and the Egress node, and the Ingress node needs to perform BFD detection on the LSP. When the Ingress node needs to perform BFD detection on the LSP, such as figure 1 As shown, the method includes the following steps:
[0036] In step 101, the Ingress node adds a label corresponding to the LSP to the BFD message to be sent to the Egress node, and the destination address of the BFD message is the IP address of the Ingress node.
[0037] In the embodiment of the present inve...
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The invention discloses a method and an apparatus for transmitting a BFD message during LSP detection by BFD. The method comprises: an Ingress node setting a destination IP (internet protocol) to the local IP address in a BFD message, adding a tag to the BFD message, and transmitting the BFD message with the tag to an Egress node; the Egress node removing the tag after receiving the BFD message with the tag, and forwarding the BFD message to the Ingress node by using the destination address of the BFD message; and the Ingress node receiving the BFD message to detect the connectivity of the LSP. In the invention, the Egress node only needs to forward the BFD message without creating a BFD session, thereby effectively improving the utilization rate of the BFD session.
Description
technical field [0001] The invention relates to the field of communication technology, in particular to a method and equipment for transmitting BFD messages when detecting LSPs through BFD. Background technique [0002] When using BFD (BidirectionalForwardingDetection, bidirectional forwarding detection) to detect the connectivity of LSP (LabelSwitchedPath, label switching path), it is necessary to establish a BFD session between the Ingress (incoming) node and the Egress (outgoing) node of the LSP, so as to use BFD Quickly detect the connectivity of the LSP; specifically, when detecting the connectivity of the LSP, the Ingress node needs to send a BFD control message, that is, forward the BFD control message along the LSP, and according to whether the BFD control message from the Egress node is received Control packets are used to determine the connectivity of the LSP; and when BFD detects an LSP failure, it can also trigger the LSP to switch traffic. [0003] Currently, a...
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IPC IPC(8): H04L12/26H04L12/70
Inventor 毛庆林
Owner XINHUASAN INFORMATION TECH CO LTD