Uplink Failure Detection (Ufd); Feature Description - Dell Force10 S4810P Configuration Manual

High-density, 1ru 48-port 10gbe switch

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Uplink Failure Detection (UFD)

Uplink Failure Detection (UFD) provides detection of the loss of upstream connectivity and, if used with

NIC teaming, automatic recovery from a failed link.

A switch provides upstream connectivity for devices, such as servers. If a switch loses its upstream

connectivity, downstream devices also lose their connectivity. However, the devices do not receive a direct

indication that upstream connectivity is lost since connectivity to the switch is still operational.

UFD allows a switch to associate downstream interfaces with upstream interfaces. When upstream

connectivity fails, the switch disables the downstream links. Failures on the downstream links allow

downstream devices to recognize the loss of upstream connectivity.

For example, in

downstream connectivity to the server. UFD operation is shown in Steps A through C:

In Step A, the server configuration uses the connection to S1 as the primary path. Network traf fic flows

from the server to S1 and then upstream to R1.

In Step B, the upstream link between S1 and R1 fails. The server continues to use the link to S1 for its

network traffic, but the traffic is not successfully switched through S1 because the upstream link is

In Step C, UFD on S1 disables the link to the server. The server then stops using the link to S1 and

switches to using its link to S2 to send traffic upstream to R1.

is supported on the following platforms:

Switches S1 and S2 both have upstream connectivity to Router R1 and

(S50 only), MXL,

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