Short overview about Aci Lacp Graceful-Convergence and what's good to know about.
Cisco ACI supports the Link Aggregation Control Protocol (LACP) for link aggregation between the leaves and the spines. The LACP graceful-convergence feature allows the leaves and spines to continue forwarding traffic during a switchover or a link failure.
LACP graceful-convergence is supported on all Cisco ACI fabrics. The feature is disabled by default. You can enable LACP graceful-convergence on a per-port-channel basis.
When you enable LACP graceful-convergence on a port channel, the port channel does not go down when one or more links in the port channel fail. The port channel remains up as long as there is at least one active link in the port channel.
LACP graceful-convergence is particularly useful in configurations where the links in the port channel are not all the same speed. For example, you can configure a port channel with two 10 Gigabit Ethernet links and two 1 Gigabit Ethernet links. If one of the 10 Gigabit Ethernet links fails, the port channel remains up because the other links are still active.
LACP graceful-convergence is also useful in configurations where the links in the port channel are not all from the same switch. For example, you can configure a port channel with two links from Switch A and two links from Switch B. If Switch A fails, the port channel remains up because the links from Switch B are still active.
LACP graceful-convergence is not supported on port channels that are configured as Layer 2 port channels. A Layer 2 port channel is a port channel that is not associated with a vPC.
LACP graceful-convergence is supported on port channels that are configured as vPCs. A vPC is a Cisco Nexus switch feature that allows you to create a port channel that spans two physical switches.
When you enable LACP graceful-convergence on a vPC, the vPC does not go down when one or more links in the vPC fail. The vPC remains up as long as there is at least one active link in the vPC.
LACP graceful-convergence is particularly useful in configurations where the links in the vPC are not all the same speed. For example, you can configure a vPC with two 10 Gigabit Ethernet links and two 1 Gigabit Ethernet links. If one of the 10 Gigabit Ethernet links fails, the vPC remains up because the other links are still active.
LACP graceful-convergence is also useful in configurations where the links in the vPC are not all from the same switch. For example, you can configure a vPC with two links from Switch A and two links from Switch B. If Switch A fails, the vPC remains up because the links from Switch B are still active.
