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Hi. Please check PM

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Hi, Its nice of you if i can work with you. Thanks

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Flex Links is a layer 2 switch feature with which we can achieve redundancy and load balancing at Layer 2 level, as an alternative to Spanning Tree Protocol (STP). Flex links are a pair of Layer 2 interfaces, such as switch ports or port channels, where one interface is configured as a backup to the other. When the primary link goes down the backup link takes over traffic forwarding. They can be configured on all switches that need redundancy, but typical place for them are in service provider or enterprise networks where customers do not want to run STP on the switch. Flex Link Examples: Scenario 1: A Downlink Switch with one primary Uplink and a backup Uplink switches. Scenario 2: Back to Back connected Switches with redundant connections. It’s very simple to configure, but requires some manual effort. You need to identify which interface is going to act as the primary active link and which is going to act as the backup link. Once it is identified, assign the backup layer 2 interface [also called Flex link] as the backup to the primary Layer 2 interface. That’s it, Flex links are enabled in your setup. Flex links are not enabled by default. The backup link will be in standby mode [ready to begin traffic forwarding] until the primary link is up and forwarding traffic. It will begin traffic forwarding if the other link shuts down. At any point of time only one interface will be in linkup state and will be actively forwarding traffic. If the primary link shuts down, the standby link takes up the duty and starts forwarding traffic. When the primary link comes back up active, it goes into standby mode and does not participate I traffic forwarding. Flex Links are supported only on Layer 2 ports and port channels, not on VLAN’s or on Layer 3 ports. We can make the primary link to be available at our our service when its link is up. This can be achieved by preemption mechanism. Configure the Flex links pair with preemption mode. So one the primary link comes back up, it will directly take over traffic forwarding by putting itself as active link [with some pre-configured preemption delay]. The other link will be put back to standby [backup] mode. Load balancing in Flex links work at VLAN level. Both the ports in the Flex link pair can be made to forward traffic simultaneously. One port in the flex links pair can be configured to forward traffic belonging to VLANs 1-50 and the other can forward traffic for VLANs 51-100. Mutually exclusive VLANs are load sharing the traffic between the Flex link pairs. If one of the ports fails, the other active link forwards all the traffic. Flex links are easy to configure, highly efficient and more controllable feature but they require manual effort which is not the case with Spanning Tree Protocol (STP). For larger networks with ever-changing link layer network STP will be the only option. Flex links are more suitable and an opt choice for service provider and core enterprise networks. Spanning Tree Protocol is disabled on Flex Link interfaces.

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please check my pm for more details and queries.

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