Cisco Systems N3KC3064TFAL3 Manuale Utente Scaricare il pdf (Pagina 20)

• Root Guard—Root Guard prevents the port from becoming the root in an STP topology.

Cisco Nexus 3000 NX-OS Layer 2 Switching Configuration Guide, Release 5.0(3)U3(1)

6 OL-26590-01

Overview

STP Extensions

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 163 164

Release 5.0(3)U3(1) 1
CONTENTS 3
OL-26590-01 v 5
OL-26590-01 vii 7
OL-26590-01 ix 9
Contents 10
Audience 11
Document Conventions 11
OL-26590-01 xiii 13
CHAPTER 1 15
2 OL-26590-01 16
Overview 17
Private VLANs 18
Spanning Tree 18
Rapid PVST+ 19
STP Extensions 19
6 OL-26590-01 20
About the Interface Command 21
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Default UDLD Configuration 23
About Interface Speed 24
About Port Profiles 25
About MTU Configuration 25
Configuring the UDLD Mode 26
Configuring Interface Speed 28
Disabling Link Negotiation 29
Enabling or Disabling CDP 31
26 OL-26590-01 40
Configuring VLANs 41
VLAN Ranges 42
Table 4: VLAN Ranges 43
Configuring a VLAN 44
Adding Ports to a VLAN 46
Configuring VTP 48
Verifying VLAN Configuration 50
Configuring Private VLANs 51
Private VLAN Ports 52
OL-26590-01 39 53
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Private VLAN Isolated Trunks 55
Private VLAN Port Isolation 55
Configuring a Private VLAN 56
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CHAPTER 6 63
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Understanding Access VLANs 65
Understanding Allowed VLANs 66
Configuring Access Host Ports 68
Configuring Trunk Ports 68
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Configuring Switching Modes 73
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Understanding the Bridge ID 78
Extended System ID 79
STP MAC Address Allocation 79
Understanding BPDUs 80
Election of the Root Bridge 81
Understanding Rapid PVST+ 82
Rapid PVST+ BPDUs 83
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Protocol Timers 85
Port Roles 85
Port States 86
Blocking State 87
Learning State 87
Forwarding State 87
Synchronization of Port Roles 88
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Port Cost 90
Port Priority 91
Enabling Rapid PVST+ per VLAN 93
Restarting the Protocol 100
PurposeCommand 101
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Configuring Rapid PVST+ 102
Information About MST 103
MST Regions 104
MST BPDUs 104
MST Configuration Information 105
IST, CIST, and CST 105
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MST Terminology 107
Hop Count 108
Boundary Ports 108
Figure 16: MST Boundary Ports 109
Port Cost and Port Priority 110
Configuring MST 111
Procedure 112
Specifying the MST Name 113
Configuring the Root Bridge 117
Configuring the Port Priority 119
Configuring the Port Cost 120
Configuring the Hello Time 121
Specifying the Link Type 125
Verifying MST Configurations 126
Configuring STP Extensions 127
Understanding BPDU Guard 128
Understanding BPDU Filtering 129
Understanding Loop Guard 130
Understanding Root Guard 130
Before You Begin 133
Enabling BPDU Guard Globally 134
Enabling Loop Guard Globally 138
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Configuring LLDP 141
Configuring MAC Addresses 145
Configuring IGMP Snooping 149
IGMPv1 and IGMPv2 150
IGMP Snooping Querier 151
IGMP Forwarding 151
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CHAPTER 14 157
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OL-26590-01 IN-1 161
IN-2 OL-26590-01 162
OL-26590-01 IN-3 163
IN-4 OL-26590-01 164

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