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Figure 25. A Two-Aggregator Stack
Stack Management Roles
The stack elects the management units for the stack management.
• Stack master — primary management unit
• Standby — secondary management unit
The master holds the control plane and the other units maintain a local copy of the forwarding databases.
From Stack master you can configure:
• System-level features that apply to all stack members
• Interface-level features for each stack member
The master synchronizes the following information with the standby unit:
• Stack unit topology
• Stack running configuration (which includes LACP, SNMP, etc.)
• Logs
The master switch maintains stack operation with minimal impact in the event of:
Stacking
189
- M I/O Aggregator 1
- 9.5(0.1) 1
- Notes, Cautions, and Warnings 2
- Contents 3
- About this Guide 13
- Related Documents 14
- Before You Start 15
- Default Settings 16
- Data Center Bridging Support 17
- Link Tracking 18
- Configuring VLANs 18
- Where to Go From Here 19
- Configuration Fundamentals 20
- Navigating CLI Modes 21
- The do Command 22
- Undoing Commands 23
- Obtaining Help 23
- Entering and Editing Commands 24
- Command History 25
- Data Center Bridging (DCB) 27
- Priority-Based Flow Control 28
- Applying a DCB Map on a Port 35
- Configuring Lossless Queues 36
- Enabling Data Center Bridging 38
- ETS Operation with DCBx 43
- DCBX Operation 44
- DCBx Port Roles 45
- DCB Configuration Exchange 46
- Configuration Source Election 46
- DCBX Example 48
- DCBX Error Messages 49
- DHCP Client 65
- DHCP Client on a VLAN 66
- Figure 6. DHCP packet Format 67
- Option 82 68
- FIP Snooping 71
- FIP Snooping on VLANs 75
- FC-MAP Value 75
- Bridge-to-FCF Links 76
- FIP Snooping Prerequisites 76
- FIP Snooping Restrictions 76
- FIP Snooping Example 83
- Debugging FIP Snooping 84
- IGMP Overview 85
- IGMP Version 2 85
- Joining a Multicast Group 86
- Leaving a Multicast Group 86
- IGMP Version 3 86
- Leaving and Staying in Groups 88
- IGMP Snooping 89
- Disabling Multicast Flooding 90
- Displaying IGMP Information 90
- Interface Types 93
- Layer 2 Mode 95
- Management Interfaces 96
- VLAN Membership 98
- VLANs and Port Tagging 99
- Configuring VLAN Membership 99
- Displaying VLAN Membership 100
- Interfaces 101
- Port Channel Interfaces 102
- Interface Range 105
- Overlap Port Ranges 106
- Create a Single-Range 106
- Create a Multiple-Range 106
- Exclude a Smaller Port Range 106
- Maintenance Using TDR 108
- MTU Size 109
- Viewing Interface Information 113
- Clearing Interface Counters 114
- Link Aggregation 122
- Uplink LAG 123
- Server-Facing LAGs 123
- LACP Modes 123
- Auto-Configured LACP Timeout 123
- LACP Example 124
- Creating a Port Channel 125
- Uplink LAGs to be Active 130
- MAC Address Station Move 139
- MAC Move Optimization 140
- Overview 141
- Optional TLVs 143
- LLDP Operation 143
- Clearing LLDP Counters 145
- Debugging LLDP 146
- Relevant Management Objects 147
- Port Monitoring 153
- Important Points to Remember 154
- Security for M I/O Aggregator 156
- AAA Authentication 157
- Enabling AAA Authentication 158
- Server-Side Configuration 159
- RADIUS Authentication 160
- Monitoring RADIUS 163
- AAA Accounting 165
- Enabling AAA Accounting 165
- Monitoring AAA Accounting 166
- TACACS+ Remote Authentication 167
- Enabling SCP and SSH 168
- Secure Shell Authentication 170
- Troubleshooting SSH 173
- VTY MAC-SA Filter Support 175
- Implementation Information 176
- Reading Managed Object Values 177
- Deriving Interface Indices 181
- Monitor Port-Channels 182
- Entity MIBS 183
- Standard VLAN MIB 185
- Configuration 186
- SNMP Traps for Link Status 187
- Stacking 188
- Stack Management Roles 189
- Stack Master Election 190
- Failover Roles 190
- MAC Addressing 191
- Stacking LAG 191
- Stacking VLANs 191
- Stacking Port Numbers 192
- Configuring a Switch Stack 194
- Accessing the CLI 195
- Adding a Stack Unit 196
- Resetting a Unit on a Stack 196
- Ethernet 197
- Using Show Commands 199
- Failure Scenarios 203
- Upgrading a Switch Stack 205
- Upgrading a Single Stack Unit 206
- Broadcast Storm Control 208
- System Time and Date 209
- Setting Daylight Savings Time 210
- Feature Description 213
- UFD and NIC Teaming 216
- Introduction 224
- Multiple Uplink LAGs 225
- Stacking in PMUX Mode 232
- Creating a DCB Map 234
- Creating an FCoE VLAN 235
- Creating an FCoE Map 235
- Sample Configuration 237
- Configure LLDP 238
- Enabling LLDP 239
- Advertising TLVs 240
- Figure 29. Configuring LLDP 241
- Configuring LLDPDU Intervals 243
- Configuring a Time to Live 243
- Virtual Link Trunking (VLT) 245
- VLT Terminology 247
- VLT Bandwidth Monitoring 250
- VLT and Stacking 251
- VLT and IGMP Snooping 251
- VLT Port Delayed Restoration 251
- VLT Routing 251
- Spanned VLANs 251
- Verifying a VLT Configuration 252
- Troubleshooting VLT 257
- FC Flex IO Modules 259
- Processing of Data Traffic 263
- Installation 266
- Unpacking the Switch 266
- NPIV Proxy Gateway Operation 270
- Terms and Definitions 271
- Upgrade Procedures 286
- Debugging and Diagnostics 287
- Software show Commands 289
- Offline Diagnostics 291
- Trace Logs 292
- Environmental Monitoring 294
- Table 26. SNMP Traps and OIDs 297
- Buffer Tuning 298
- Deciding to Tune Buffers 299
- Troubleshooting Packet Loss 303
- Dataplane Statistics 304
- Displaying Drop Counters 306
- Power-cycling the unit(s) 308
- Standards Compliance 309
- General Internet Protocols 310
- General IPv4 Protocols 310
- Network Management 311
- MIB Location 314
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