Dell Networking S6000 Instrukcja Użytkownika Strona 822
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Figure 115. STP Loop Guard Prevents Forwarding Loops
Configuring Loop Guard
Enable STP loop guard on a per-port or per-port channel basis.
Dell Networking OS Behavior: The following conditions apply to a port enabled with loop guard:
• Loop guard is supported on any STP-enabled port or port-channel interface.
• Loop guard is supported on a port or port-channel in any spanning tree mode:
– Spanning Tree Protocol (STP)
– Rapid Spanning Tree Protocol (RSTP)
– Multiple Spanning Tree Protocol (MSTP)
– Per-VLAN Spanning Tree Plus (PVST+)
822
Spanning Tree Protocol (STP)
- 9.5(0.1) 1
- Notes, Cautions, and Warnings 2
- Contents 3
- About this Guide 32
- Configuration Fundamentals 33
- Navigating CLI Modes 34
- The do Command 37
- Undoing Commands 38
- Obtaining Help 39
- Entering and Editing Commands 39
- Command History 40
- Getting Started 43
- Default Configuration 44
- Configuring a Host Name 44
- Accessing the System Remotely 45
- Configure a Management Route 46
- Configuration File Management 47
- Viewing Files 49
- Managing the File System 50
- View Command History 51
- Upgrading Dell Networking OS 51
- Using HTTP for File Transfers 51
- Management 54
- Configuring Logging 57
- Audit and Security Logs 58
- Configuring Logging Format 59
- Disabling System Logging 61
- Configuration 63
- Synchronizing Log Messages 65
- File Transfer Services 66
- Terminal Lines 68
- Lock CONFIGURATION Mode 71
- S6000MXL Switch 72
- Configuring 802.1X 78
- Enabling 802.1X 79
- Re-Authenticating a Port 83
- Configuring Timeouts 84
- Authentication 85
- Configuring a Guest VLAN 87
- CAM Usage 90
- ACLs and VLANs 92
- ACL Optimization 92
- Configure Route Map Filters 95
- Configuring Match Routes 96
- Configuring Set Conditions 97
- Continue Clause 99
- IP Fragment Handling 100
- Layer 4 ACL Rules Examples 101
- Configure a Standard IP ACL 102
- Access Control Lists (ACLs) 103
- Configure an Extended IP ACL 104
- Applying an IP ACL 107
- Configure Ingress ACLs 108
- Configure Egress ACLs 109
- IP Prefix Lists 110
- Implementation Information 111
- Viewing Prefix Lists 113
- ACL Resequencing 115
- Route Maps 117
- How BFD Works 121
- BFD Packet Format 122
- BFD Sessions 124
- BFD Three-Way Handshake 124
- Session State Changes 125
- Important Points to Remember 126
- Configure BFD 126
- Related Configuration Tasks 127
- Enabling BFD Globally 127
- Disabling and Re-Enabling BFD 130
- Configure BFD for OSPF 132
- Disabling BFD for OSPF 134
- Configure BFD for OSPFv3 135
- Configure BFD for IS-IS 136
- Disabling BFD for IS-IS 138
- Configure BFD for BGP 139
- Disabling BFD for BGP 141
- Use BFD in a BGP Peer Group 142
- Configure BFD for VRRP 146
- Configuring Protocol Liveness 149
- Troubleshooting BFD 149
- Autonomous Systems (AS) 151
- Figure 17. Internal BGP 152
- Sessions and Peers 153
- Route Reflectors 154
- BGP Attributes 155
- Best Path Selection Criteria 156
- Best Path Selection Details 157
- Local Preference 158
- Next Hop 161
- Multiprotocol BGP 162
- Four-Byte AS Numbers 163
- AS4 Number Representation 164
- AS Number Migration 165
- Configuration Information 168
- BGP Configuration 168
- Enabling BGP 169
- Configuring Peer Groups 175
- Configuring Passive Peering 179
- Enabling Graceful Restart 182
- Redistributing Routes 186
- Enabling Additional Paths 187
- Changing MED Attributes 192
- Changing the WEIGHT Attribute 194
- Enabling Multipath 194
- Filtering BGP Routes 194
- Aggregating Routes 198
- Enabling Route Flap Dampening 199
- Changing BGP Timers 202
- Enabling MBGP Configurations 204
- Debugging BGP 205
- Storing Last and Bad PDUs 206
- Capturing PDUs 207
- PDU Counters 208
- Sample Configurations 209
- CAM Allocation 215
- Test CAM Usage 217
- View CAM Profiles 217
- View CAM-ACL Settings 218
- View CAM Usage 220
- CAM Optimization 220
- Troubleshoot CAM Profiling 221
- Control Plane Policing (CoPP) 223
- Show Commands 228
- Data Center Bridging (DCB) 230
- Priority-Based Flow Control 231
- Enabling Data Center Bridging 236
- Configuring Lossless Queues 240
- ETS Operation with DCBx 247
- Configure a DCBx Operation 249
- DCBx Operation 250
- DCBx Port Roles 250
- DCB Configuration Exchange 252
- Configuration Source Election 252
- Behavior of Tagged Packets 254
- DCBx Example 255
- Configuring DCBx 256
- DCBx Error Messages 259
- Applying a DCB Map on a Port 278
- PFC Configuration Notes 281
- ETS Configuration Notes 283
- Pause and Resume of Traffic 284
- Settings 285
- Figure 31. DHCP packet Format 289
- Configuration Tasks 294
- Specifying a Default Gateway 295
- Debugging the DHCP Server 296
- Using DHCP Clear Commands 296
- Stacking 299
- Virtual Link Trunking (VLT) 300
- VLAN and Port Channels 300
- DHCP Snooping 300
- DHCP Server 300
- Configure Secure DHCP 301
- Clearing the Binding Table 303
- Dynamic ARP Inspection 304
- Source Address Validation 306
- Equal Cost Multi-Path (ECMP) 309
- Link Bundle Monitoring 310
- Managing ECMP Group Paths 311
- Creating an ECMP Group Bundle 312
- FCoE Transit 315
- Table 20. FIP Functions 316
- Using FIP Snooping 319
- Enable FIP Snooping on VLANs 321
- Configure the FC-MAP Value 321
- FIP Snooping Restrictions 322
- Configuring FIP Snooping 322
- Flex Hash Capability Overview 331
- Optimizing the Boot Time 332
- LACP and IPv4 Routing 334
- LACP and IPv6 Routing 335
- BGP Graceful Restart 335
- Software Upgrade 336
- LACP Fast Switchover 336
- Changes to BGP Multipath 336
- Protocol Overview 339
- Ring Status 340
- Multiple FRRP Rings 341
- Important FRRP Points 341
- Important FRRP Concepts 341
- Implementing FRRP 343
- FRRP Configuration 343
- Configuring the Control VLAN 344
- Setting the FRRP Timers 346
- Clearing the FRRP Counters 347
- Viewing the FRRP Information 347
- Troubleshooting FRRP 348
- Configure GVRP 351
- Enabling GVRP Globally 352
- Configure GVRP Registration 352
- Configure a GARP Timer 353
- LeaveAll Timer 5000 354
- Dell(conf)# 354
- IGMP Protocol Overview 355
- Join a Multicast Group 356
- Responding to an IGMP Query 356
- Leaving a Multicast Group 356
- IGMP Version 3 357
- Leaving and Staying in Groups 359
- Configure IGMP 360
- Selecting an IGMP Version 361
- Viewing IGMP Groups 362
- Adjusting Timers 362
- Enabling IGMP Immediate-Leave 364
- IGMP Snooping 364
- Disabling Multicast Flooding 365
- Applications 367
- Protocol Separation 368
- Interfaces 377
- Interface Types 378
- Enabling a Physical Interface 380
- Physical Interfaces 380
- Overview of Layer Modes 381
- Management Interfaces 385
- VLAN Interfaces 386
- Loopback Interfaces 387
- Null Interfaces 388
- Port Channel Interfaces 388
- Port Channel Benefits 389
- Port Channel Implementation 389
- Creating a Port Channel 390
- Changing the Hash Algorithm 396
- Bulk Configuration 397
- Bulk Configuration Examples 398
- Define the Interface Range 399
- Maintenance Using TDR 401
- Support for LM4 Optics 404
- Example Scenarios 404
- Link Dampening 408
- Clearing Dampening Counters 409
- Threshold Settings 411
- Enabling Pause Frames 411
- Table 29. Layer 2 Overhead 412
- Port-Pipes 413
- Set Auto-Negotiation Options 415
- Dynamic Counters 418
- IPv4 Routing 423
- Configuring Static Routes 425
- Messages 427
- Enabling Directed Broadcast 428
- Resolution of Host Names 428
- Configuration Tasks for ARP 431
- Enabling Proxy ARP 432
- Clearing ARP Cache 432
- ARP Learning via ARP Request 433
- Configuring ARP Retries 434
- Configuration Tasks for ICMP 435
- UDP Helper 436
- Enabling UDP Helper 436
- Troubleshooting UDP Helper 440
- IPv6 Routing 441
- IPv6 Headers 442
- IPv6 Header Fields 444
- Extension Header Fields 445
- Addressing 446
- Link-local Addresses 447
- Static and Dynamic Addressing 447
- Path MTU Discovery 450
- IPv6 Neighbor Discovery 451
- Configuration Tasks for IPv6 454
- Adjusting Your CAM-Profile 455
- Assigning a Static IPv6 Route 456
- Configuring Telnet with IPv6 457
- SNMP over IPv6 457
- Showing IPv6 Information 457
- Showing an IPv6 Interface 458
- Showing IPv6 Routes 459
- Clearing IPv6 Routes 460
- IS-IS Protocol Overview 472
- IS-IS Addressing 472
- Multi-Topology IS-IS 473
- Graceful Restart 474
- Enabling IS-IS 477
- Changing LSP Attributes 482
- Table 32. Metric Styles 483
- Configuring the IS-IS Cost 484
- Changing the IS-Type 485
- Controlling Routing Updates 486
- Distribute Routes 486
- Applying IPv4 Routes 486
- Applying IPv6 Routes 487
- Redistributing IPv4 Routes 488
- Redistributing IPv6 Routes 489
- Setting the Overload Bit 490
- Debugging IS-IS 491
- IS-IS Metric Styles 492
- Configure Metric Values 492
- LACP Modes 499
- Configuring LACP Commands 499
- LACP Configuration Tasks 500
- Setting the LACP Long Timeout 501
- Shared LAG State Tracking 502
- Configure a LAG on ALPHA 505
- Manage the MAC Address Table 513
- MAC Learning Limit 514
- NIC Teaming 518
- Configure Redundant Pairs 519
- Far-End Failure Detection 522
- FEFD State Changes 523
- Configuring FEFD 524
- Enabling FEFD on an Interface 525
- Debugging FEFD 526
- An RPM Failover 527
- 802.1AB (LLDP) Overview 528
- Optional TLVs 529
- Table 38. Optional TLV Types 530
- TIA-1057 (LLDP-MED) Overview 531
- LLDP-MED Capabilities TLV 533
- LLDP-MED Network Policies TLV 534
- Configure LLDP 536
- LLDP Compatibility 537
- Enabling LLDP 538
- Advertising TLVs 539
- Figure 72. Configuring LLDP 540
- Configuring LLDPDU Intervals 542
- Configuring a Time to Live 543
- Debugging LLDP 544
- Relevant Management Objects 545
- NLB Unicast Mode Scenario 551
- NLB Multicast Mode Scenario 552
- Configuring a Switch for NLB 553
- Anycast RP 556
- Enable MSDP 560
- Terminating a Peership 570
- Clearing Peer Statistics 570
- Debugging MSDP 571
- MSDP with Anycast RP 571
- Configuring Anycast RP 573
- MSDP Sample Configurations 576
- Spanning Tree Variations 580
- Modifying Global Parameters 584
- Configuring an EdgePort 586
- MSTP Sample Configurations 587
- Multicast Features 594
- Multicast Policies 596
- Area Types 606
- Networks and Neighbors 607
- Router Types 607
- Backbone Router (BR) 608
- Area Border Router (ABR) 608
- Internal Router (IR) 609
- LSA Throttling 610
- OSPF with Dell Networking OS 611
- OSPF ACK Packing 615
- Assigning a Router ID 617
- Assigning an OSPFv2 Area 619
- Enable OSPFv2 on Interfaces 619
- Configuring Stub Areas 621
- Enabling Passive Interfaces 622
- Enabling Fast-Convergence 623
- Creating Filter Routes 628
- Applying Prefix Lists 628
- Troubleshooting OSPFv2 629
- Basic OSPFv2 Router Topology 631
- OSPF Area 0 — Gl 1/1 and 1/2 631
- OSPF Area 0 — Gl 3/1 and 3/2 632
- OSPF Area 0 — Gl 2/1 and 2/2 632
- Enabling IPv6 Unicast Routing 633
- Configuring Passive-Interface 634
- Configuring a Default Route 635
- Displaying Graceful Restart 637
- Troubleshooting OSPFv3 645
- Viewing Summary Information 646
- Policy-based Routing (PBR) 647
- Networking OS 649
- PBR Exceptions (Permit) 652
- Sample Configuration 654
- Create the Redirect-List GOLD 655
- View Redirect-List GOLD 656
- PIM Sparse-Mode (PIM-SM) 657
- Refuse Multicast Traffic 658
- Send Multicast Traffic 658
- Configuring PIM-SM 659
- Enable PIM-SM 659
- Configuring S,G Expiry Timers 660
- Configure PIM-SMM 665
- Enabling PIM-SSM 665
- Port Monitoring 668
- Configuring Port Monitoring 670
- Remote Port Mirroring 673
- Configuration Notes 674
- Restrictions 676
- Configuration steps for ERPM 680
- Enabling PVST+ 685
- Disabling PVST+ 686
- PVST+ Sample Configurations 692
- Quality of Service (QoS) 694
- Port-Based QoS Configurations 696
- Classify Traffic 700
- Creating a Layer 2 Class Map 701
- Create a QoS Policy 704
- DSCP Color Maps 706
- Displaying DSCP Color Maps 707
- Create Policy Maps 708
- Creating Output Policy Maps 711
- Enabling QoS Rate Adjustment 712
- Creating WRED Profiles 715
- Marking Packets 722
- Enabling RIP Globally 731
- Configure RIP on Interfaces 732
- Generating a Default Route 735
- Summarize Routes 735
- Controlling Route Metrics 736
- Debugging RIP 736
- RIP Configuration Example 737
- Core 2 RIP Output 738
- RIP Configuration on Core3 739
- Core 3 RIP Output 739
- RIP Configuration Summary 741
- Remote Monitoring (RMON) 743
- Setting the rmon Alarm 744
- Configuring an RMON Event 745
- Service Provider Bridging 758
- Configure VLAN Stacking 760
- Debugging VLAN Stacking 762
- VLAN Stacking 763
- Enabling Drop Eligibility 766
- Layer 2 Protocol Tunneling 770
- Setting Rate-Limit BPDUs 773
- Provider Backbone Bridging 774
- Overview 775
- Enabling Extended sFlow 776
- Displaying Show sFlow Global 777
- Back-Off Mechanism 779
- SNMPv3 Compliance With FIPS 783
- Set up SNMP 785
- Creating a Community 786
- Reading Managed Object Values 787
- Writing Managed Object Values 788
- Copying a Configuration File 795
- Manage VLANs using SNMP 799
- Managing Overload on Startup 801
- Deriving Interface Indices 804
- Monitor Port-Channels 805
- Storm Control 807
- Spanning Tree Protocol (STP) 808
- Enabling PortFast 814
- Selecting STP Root 817
- STP Root Guard 818
- Configuring Root Guard 819
- STP Loop Guard 821
- Configuring Loop Guard 822
- System Time and Date 824
- Enabling NTP 826
- Configuring NTP Broadcasts 827
- Disabling NTP on an Interface 827
- Configuration Task List 831
- Setting the Timezone 832
- Set Daylight Saving Time 832
- Tunneling 835
- Interfaces for Tunnels 839
- Upgrade Procedures 840
- Virtual LANs (VLANs) 841
- Port-Based VLANs 842
- VLANs and Port Tagging 842
- Moving Untagged Interfaces 845
- Configuring Native VLANs 847
- VLT Proxy Gateway 849
- VLT on Core Switches 857
- Enhanced VLT 857
- VLT Terminology 858
- RSTP and VLT 864
- VLT Bandwidth Monitoring 864
- VLT and IGMP Snooping 865
- VLT IPv6 865
- VLT Port Delayed Restoration 865
- VLT Routing 867
- Configuring VLT Unicast 868
- VLT Multicast Routing 868
- Configuring VLT Multicast 869
- RSTP Configuration 870
- Sample RSTP Configuration 871
- Configuring VLT 871
- Configuring a VLT Backup Link 873
- VLT Sample Configuration 878
- Verifying a VLT Configuration 886
- Access Switch) 891
- Troubleshooting VLT 892
- Components of VXLAN network 903
- VXLAN Frame Format 905
- Controller GUI 906
- 2. Create Service Node 907
- Configuring VxLAN Gateway 909
- VRF Overview 913
- VRF Configuration Notes 914
- Table 74 915
- VRF Configuration 917
- View VRF Instance Information 918
- Sample VRF Configuration 919
- Route Leaking VRFs 927
- VRRP Overview 928
- VRRP Benefits 929
- VRRP Implementation 929
- VRRP Configuration 930
- Assign Virtual IP addresses 932
- Disabling Preempt 935
- Track an Interface or Object 937
- Tracking an Interface 938
- VRRP in a VRF Configuration 945
- VLAN Scenario 947
- Offline Diagnostics 950
- Configuring Fanout Mode 955
- Trace Logs 958
- Hardware Watchdog Timer 959
- Table 76. SNMP Traps and OIDs 960
- Buffer Tuning 961
- Deciding to Tune Buffers 963
- Troubleshooting Packet Loss 967
- Dataplane Statistics 968
- Display Stack Port Statistics 969
- Display Stack Member Counters 970
- Mini Core Dumps 971
- Enabling TCP Dumps 972
- Standards Compliance 973
- RFC and I-D Compliance 974
- General IPv4 Protocols 975
- General IPv6 Protocols 976
- Border Gateway Protocol (BGP) 976
- Multicast 979
- Network Management 979
- MIB Location 986
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