Dell C9000 Line Cards Networking Configuration Guide for the C9000 Series Vers - Page 1027
UFD and NIC Teaming, Important Points to Remember, backup link in order.
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Figure 132. Uplink Failure Detection Example If only one of the upstream interfaces in an uplink-state group goes down, a specified number of downstream ports associated with the upstream interface are put into a Link-Down state. You can configure this number and is calculated by the ratio of the upstream port bandwidth to the downstream port bandwidth in the same uplink-state group. This calculation ensures that there is no traffic drops due to insufficient bandwidth on the upstream links to the routers/switches. By default, if all upstream interfaces in an uplink-state group go down, all downstream interfaces in the same uplink-state group are put into a Link-Down state. Using UFD, you can configure the automatic recovery of downstream ports in an uplink-state group when the link status of an upstream port changes. The tracking of upstream link status does not have a major impact on central processing unit (CPU) usage. UFD and NIC Teaming To implement a rapid failover solution, you can use uplink failure detection on a switch with network adapter teaming on a server. For more information, refer to NIC Teaming. For example, as shown previously, the switch/ router with UFD detects the uplink failure and automatically disables the associated downstream link port to the server. To continue to transmit traffic upstream, the server with NIC teaming detects the disabled link and automatically switches over to the backup link in order. Important Points to Remember When you configure UFD, the following conditions apply. • You can configure up to 16 uplink-state groups. By default, no uplink-state groups are created. - An uplink-state group is considered to be operationally up if it has at least one upstream interface in the Link-Up state. Uplink Failure Detection (UFD) 1027
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