PE Device P2P VXLAN Tunnel Bypassing for AC Link Faults
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Solution Overview
Problem
In EVPN-VPWS networks, packet loss occurs due to the long fault perception and notification processes when a fault occurs on an AC side link, leading to transient packet duplication and inefficient traffic routing.
Innovation Solution
A packet processing method where a PE device establishes a P2P VXLAN tunnel with another PE device when a fault is detected on the AC side link, allowing data traffic to be bypassed and forwarded through the secondary tunnel, reducing packet loss by enabling immediate traffic rerouting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the PE device waits for EVPN route notification to switch traffic routing after detecting a fault, then the routing decision is based on accurate fault information, but packet loss occurs during the notification delay period
Solution Approach 1:
The patent establishes a P2P VXLAN tunnel in advance before fault occurs, between the first PE device and second PE device. When fault is detected on the AC side link, this pre-established tunnel enables immediate traffic bypassing without waiting for EVPN route notification, thus resolving the contradiction between routing accuracy and notification delay
Solution Approach 2:
The P2P VXLAN tunnel acts as an intermediary communication path between the first PE device and second PE device. When the primary AC side link fails, this intermediary tunnel allows traffic to be forwarded through an alternative route, maintaining connectivity while the fault notification process continues
2Loss of time
If the PE device implements immediate traffic bypassing when fault is detected, then packet loss is reduced, but additional routing complexity is introduced
Solution Approach 1:
The P2P VXLAN tunnel is pre-established between PE devices before fault occurs. This preliminary setup means that when fault detection happens, the bypass path is already ready and simply needs to be activated, reducing the complexity of real-time tunnel establishment while achieving immediate traffic bypassing
Solution Approach 2:
The routing mechanism dynamically switches between the primary AC side link and the alternative P2P VXLAN tunnel based on fault conditions. The system maintains flexibility by enabling seamless transition between routing paths without requiring complete reconfiguration, thus managing complexity while achieving fast response
Data Source
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AI summary
A packet processing method, a device, and a system are disclosed. The method includes: receiving, by a first PE device, a first VXLAN packet through a first P2P VXLAN tunnel between the first PE device and a third PE device, where a CE device is dual-homed to the first PE device and a second PE device respectively through a first Ethernet link and a second Ethernet link; and forwarding, by the first PE device, the first VXLAN packet to the second PE device through a third P2P VXLAN tunnel from the first PE device to the second PE device when the first PE device determines that there is a fault on the first Ethernet link, where the first Ethernet link connected to the first PE device and a link formed by the third P2P VXLAN tunnel and the second Ethernet link have a primary/secondary relationship. Therefore, transient traffic bypassing is implemented, which helps to reduce a packet loss of data traffic in a transmission process.