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Fast rerouting method and label exchange router
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A fast and routing technology, applied in the field of communication, can solve problems such as simultaneous failure of two links, achieve the effect of perfecting fast rerouting technology and improving stability
Active Publication Date: 2011-04-06
HUAWEI TECH CO LTD
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Problems solved by technology
[0014] To sum up, when the fast rerouting mechanism of the existing technology cannot realize the nesting protection, the situation that two links connected to a certain node fail at the same time
Method used
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Embodiment 1
[0045] Embodiment 1: link failure upstream node processing flow: the upstream node changes the PathErr message processing flow, and unbinds with the bypass tunnel in time;
[0046] As shown in Figure 4, the dotted line in Figure 4 indicates the sending direction of path messages, R1 to R4 is a protected tunnel, the main tunnel passes through paths R1, R2, R3, and R4, and R1 passes through bypass tunnel T1 (paths R1, R3) as The next hop node R2 provides node protection. R2 provides node protection for the next-hop node R3 through the bypass tunnel T2 (path R2, R4). When the link R2-R3 fails, the specific operation process includes the following steps:
[0047] Step 1: When the link R2-R3 fails, R2 sends a PathErr message with the error code "Notification" and the error value "Tunnel is locally protected" upstream to R1;
[0048] Step 2: R1 receives the message and judges whether it is the PLR of a node-protected bypass tunnel. If R1 is the PLR of the node-protected bypass...
Embodiment 2
[0062] Embodiment 2, the processing procedure when the link is nested and protected
[0063] The method described in the first embodiment above is also applicable to the situation of link nesting protection, and the operation principle is the same, and will be described with specific examples below.
[0064] As shown in FIG. 6 , the dotted line indicates the sending direction of path messages, R2 is the head node of the bypass tunnel T2 protected by the link, and R2 is protected by the node of the bypass tunnel T1 at the same time. When the link R2-R3 fails, R2 sends a Path message to R3 via T2. At the same time, R2 will also send a PathErr message to R1 to notify fast rerouting switching. R1 will re-evaluate the binding relationship between the protected tunnel and the bypass tunnel T1, and find that R3 can still serve as the MP. Therefore, this binding relationship will not be released. At this time, if the link R1-R2 fails, R3 receives a Path message sent from T1. Since ...
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Abstract
The invention relates to a quick rerouting method in communication technology field and label switching router. The label switching router comprises: route message judging module, a first judging module, a second judging module and routemessage processing module. The routemessage processing module judges if the received message is received from bypass tunnel; if the received message is receivedfrom bypass tunnel, then judges if the protected tunnel passes head node of bypass tunnel employing the present node as fusion node, if the protected tunnel does not pass head node, then discards theroute message or receives the route message; if the route message is received from ordinary route of non-bypass tunnel, then judges if the head node of bypass tunnel currently used is in route recording object of route message received from the ordinary route, if the head node is not in route recording object, then receives the route message or discards the route message received from the ordinary route. The invention effectively solves problem of adjacent double link failure under nesting protection through changing processing flow of node for route error message and route message.
Description
technical field [0001] The invention relates to the technical field of communication, in particular to a fast rerouting method and a label switching router applying the method. Background technique [0002] Fast reroute is a mechanism to protect against link or node failures of MPLS (Multi-Protocol Label Switching) traffic engineering label-switched paths by providing local protection if somewhere in the label-switched path fails. It allows the head node to try to establish a new end-to-end LSP (label switching path) to replace the old LSP. Before the new LSP is successfully established, the data continues to pass through the old LSP. Fast rerouting restores the protected LSP locally by rerouting the LSP to a bypass tunnel that bypasses the failed link or node. A bypass tunnel bypassing a failed link is said to provide link protection, and a bypass tunnel bypassing a failed node is said to provide node protection. These bypass tunnels are established and bound to protected...
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