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Uplink Failure Detection (UFD) | 241
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Uplink Failure Detection (UFD)
Feature Description
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 Figure 19-1 Switches S1 and S2 both have upstream connectivity to Router R1 and
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 traffic 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
down.
• 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.
Note: In Standalone, VLT, and Stacking modes, the UFD group number is 1 by default and cannot be
changed.
- Dell PowerEdge Configuration 1
- Notes, Cautions, and Warnings 2
- About this Guide 11
- Conventions 12
- Information Symbols 12
- Related Documents 12
- Configuration Fundamentals 13
- CLI Modes 14
- Navigating CLI Modes 15
- Undoing Commands 16
- Obtaining Help 17
- Entering and Editing Commands 18
- Command History 19
- Getting Started 23
- Front Panel 24
- Port Numbering 24
- Uplink Ports 25
- Stacking Ports 25
- Port Configuration 25
- Console access 26
- Boot Process 27
- 18 28
- Getting Started 29
- 20 30
- Getting Started 31
- Configure a Host Name 32
- Access the System Remotely 32
- Configure the Enable Password 34
- Configuration File Management 35
- View Files 39
- View Configuration Files 40
- File System Management 41
- View the Command History 42
- Upgrading FTOS 43
- 34 44
- Aggregator Management 45
- Disabling System Logging 46
- 38 48
- Aggregator Management 49
- File Transfer Services 50
- Enabling the FTP Server 51
- Terminal Lines 52
- Aggregator Management 55
- 46 56
- Data Center Bridging (DCB) 57
- Priority-Based Flow Control 58
- When DCB is Enabled 66
- Lossless Traffic Handling 67
- Enabling DCB on Next Reload 67
- Important: of two 68
- ETS Operation with DCBx 70
- DCBX Operation 71
- DCBx Operation 72
- DCBx Port Roles 72
- DCB Configuration Exchange 73
- DCBx Example 75
- DCBX Error Messages 77
- Verifying DCB Configuration 78
- DHCP Overview 93
- Relay Agent 95
- DHCP Client 96
- DHCP Client on a VLAN 102
- Configure Secure DHCP 103
- DHCP Snooping 104
- Clear the Binding Table 105
- Dynamic ARP Inspection 107
- command 108
- (Figure 6-9) 108
- Source Address Validation 109
- IP Source Address Validation 110
- FIP Snooping 113
- 104 114
- FIP Snooping 115
- 106 116
- FIP Snooping 117
- FIP Snooping on VLANs 118
- FC-MAP Value 118
- Bridge-to-FCF Links 118
- FIP Snooping Prerequisites 119
- FIP Snooping Restrictions 119
- 110 120
- Field Description 121
- FIP Snooping 123
- 114 124
- Raja: Can be re 126
- FIP Snooping Example 127
- Debugging FIP Snooping 128
- IGMP Overview 129
- Joining a Multicast Group 130
- Leaving a Multicast Group 130
- IGMP Packet 130
- IGMP Version 3 131
- IGMP Snooping 133
- Disabling Multicast Flooding 134
- Displaying IGMP Information 134
- Interfaces 137
- Interface Auto-Configuration 138
- Interface Types 138
- Viewing Interface Information 139
- 130 140
- Layer 2 Mode 142
- Management Interfaces 142
- interface 143
- (Figure 9-5) 144
- Interfaces 145
- {forwarding-router-address 145
- ManagementEthernet slot/port} 145
- VLAN Membership 146
- Port-Based VLANs 147
- VLANs and Port Tagging 147
- Configuring VLAN Membership 148
- Displaying VLAN Membership 149
- 140 150
- Port Channel Interfaces 151
- Port Channel Benefits 152
- Port Channel Implementation 152
- Interfaces 153
- 144 154
- Interfaces 155
- Interface Range 156
- Create a Multiple-Range 157
- Exclude a Smaller Port Range 157
- Overlap Port Ranges 157
- Interfaces 159
- Maintenance Using TDR 160
- rx off tx off 161
- MTU Size 162
- 154 164
- Interfaces 165
- Interfaces 167
- Clearing Interface Counters 168
- 160 170
- 162 172
- 164 174
- Link Aggregation 175
- Server-Facing LAGs 176
- LACP Modes 176
- Auto-Configured LACP Timeout 176
- LACP Example 177
- 168 178
- Link Aggregation 179
- 170 180
- Link Aggregation 181
- 172 182
- Clearing MAC Address Entries 183
- MAC Address Station Move 185
- MAC Move Optimization 185
- 176 186
- Overview 187
- Optional TLVs 188
- TIA-1057 (LLDP-MED) Overview 190
- LLDP-MED Capabilities TLV 192
- LLDP-MED Network Policies TLV 193
- Extended Power via MDI TLV 194
- LLDP Operation 195
- (Figure 13-10) 196
- Clearing LLDP Counters 198
- Debugging LLDP 199
- Relevant Management Objects 200
- Port Monitoring 205
- Port Monitoring 207
- Configuring Port Monitoring 208
- Port Monitoring 209
- 200 210
- Implementation Information 211
- Read Managed Object Values 212
- , as shown in Figure 15-5 214
- , as shown in Figure 15-6 214
- Deriving Interface Indices 217
- Monitor Port-channels 219
- Entity MIBS 220
- Stacking 223
- Stack Management Roles 224
- Stack Master Election 225
- Failover Roles 225
- MAC Addressing 226
- Stacking LAG 226
- Stacking VLANs 226
- Stacking Port Numbers 227
- Configuring a Switch Stack 227
- Stacking Prerequisites 228
- Cabling Stacked Switches 228
- Accessing the CLI 229
- Adding a Stack Unit 230
- Resetting a Unit on a Stack 231
- Using LEDs 232
- Using Show Commands 232
- Stacking 233
- 224 234
- Stacking 235
- Troubleshooting Commands 236
- Stacking 237
- Indicates master unit 237
- Indicates standby unit 237
- Failover type with redundancy 237
- Failure Scenarios 238
- Master Switch Fails 239
- Stack-Link Flapping Error 239
- 230 240
- Upgrading a Switch Stack 241
- Upgrading a Single Stack Unit 242
- Broadcast Storm Control 243
- 234 244
- System Time and Date 245
- Setting the Time Zone 247
- Setting Daylight Savings Time 248
- Feature Description 251
- UFD and NIC Teaming 253
- Important Points to Remember 254
- {interface interface 256
- [group-id] [detail] 258
- [group-id] 258
- Figure 19-5 260
- Command: UFD Output 260
- Figure 19-6 260
- Command: UFD Output 260
- Upgrade Procedures 263
- 254 264
- Debugging and Diagnostics 265
- Software show Commands 270
- Offline Diagnostics 272
- Trace Logs 273
- Show Hardware Commands 274
- Environmental Monitoring 275
- Buffer Tuning 279
- Deciding to Tune Buffers 281
- Buffer Tuning Commands 281
- buffer-profile [detail 282
- Troubleshooting Packet Loss 285
- Displaying Drop Counters 286
- Dataplane Statistics 287
- Application Core Dumps 290
- Mini Core Dumps 290
- TCP Dumps 292
- Default Settings 293
- Standards Compliance 295
- RFC and I-D Compliance 296
- General IPv4 Protocols 297
- Network Management 298
- Standards Compliance 299
- MIB Location 300
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