Dell PowerSwitch S4112F-ON OS10 Enterprise Edition User Guide Release 10.4.1.0 - Page 546
Uplink Failure Detection, snmp-server location, snmp-server vrf
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snmp-server location Configures the location of the SNMP server. Syntax Parameters Default Command Mode Usage Information Example snmp-server location text text - Enter an alphanumeric string (up to 55 characters). United States CONFIGURATION The no version of this command removes the SNMP location. OS10(config)# snmp-server location datacenter10 Supported Releases 10.2.0E or later snmp-server vrf Configures an SNMP agent to receive SNMP traps for the management VRF instance. Syntax Parameters Defaults Command Mode Usage Information Example snmp-server vrf management None Not configured CONFIGURATION The no version of this command disables the SNMP agent from receiving the SNMP traps. OS10(config)# snmp-server vrf management Supported Releases 10.4.1.0 or later Uplink Failure Detection Uplink failure detection (UFD) indicates the loss of upstream connectivity to servers connected to the switch. A switch provides upstream connectivity for devices, such as servers. If the switch loses upstream connectivity, the downstream devices also lose connectivity. However, the downstream devices do not generally receive an indication that the upstream connectivity was lost because connectivity to the switch is still operational. To solve this issue, use UFD. UFD associates downstream interfaces with upstream interfaces. When upstream connectivity fails, the switch operationally disables its downstream links. Failures on the downstream links allow downstream devices to recognize the loss of upstream connectivity. This allows the downstream servers to select alternate paths, if available, to send traffic to upstream devices. UFD creates an association between upstream and downstream interfaces known as uplink-state group. An interface in an uplink-state group can be a physical Ethernet or fibre channel interface or a port-channel. An enabled uplink-state group tracks the state of all assigned upstream interfaces. The failure of upstream interfaces results in automatic disabling of downstream interfaces in the uplink-state group, as shown in the following illustration. If only one of the upstream interfaces in an uplink-state group goes down, a specific number of downstream interfaces in the same uplink-state group go down. You can configure the number of downstream interfaces that go down based on the traffic conditions from the server to upstream interfaces. This avoids overloading traffic on upstream ports. 546 System management
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