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CHAPTER 6
Configuring Access and Trunk Interfaces
This chapter contains the following sections:
•
Information About Access and Trunk Interfaces, page 49
•
Configuring Access and Trunk Interfaces, page 53
•
Verifying Interface Configuration, page 57
Information About Access and Trunk Interfaces
Understanding Access and Trunk Interfaces
Ethernet interfaces can be configured either as access ports or a trunk ports, as follows:
•
An access port can have only one VLAN configured on the interface; it can carry traffic for only one
VLAN.
•
A trunk port can have two or more VLANs configured on the interface; it can carry traffic for several
VLANs simultaneously.
Cisco NX-OS supports only IEEE 802.1Q-type VLAN trunk encapsulation.Note
Cisco Nexus 3000 NX-OS Layer 2 Switching Configuration Guide, Release 5.0(3)U3(1)
OL-26590-01 49
- 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
- 8 OL-26590-01 22
- 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
- 40 OL-26590-01 54
- Private VLAN Isolated Trunks 55
- Private VLAN Port Isolation 55
- Configuring a Private VLAN 56
- 48 OL-26590-01 62
- CHAPTER 6 63
- 50 OL-26590-01 64
- Understanding Access VLANs 65
- Understanding Allowed VLANs 66
- Configuring Access Host Ports 68
- Configuring Trunk Ports 68
- 58 OL-26590-01 72
- Configuring Switching Modes 73
- 60 OL-26590-01 74
- 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
- 70 OL-26590-01 84
- Protocol Timers 85
- Port Roles 85
- Port States 86
- Blocking State 87
- Learning State 87
- Forwarding State 87
- Synchronization of Port Roles 88
- OL-26590-01 75 89
- Port Cost 90
- Port Priority 91
- Enabling Rapid PVST+ per VLAN 93
- Restarting the Protocol 100
- PurposeCommand 101
- 88 OL-26590-01 102
- Configuring Rapid PVST+ 102
- Information About MST 103
- MST Regions 104
- MST BPDUs 104
- MST Configuration Information 105
- IST, CIST, and CST 105
- 92 OL-26590-01 106
- 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
- 126 OL-26590-01 140
- Configuring LLDP 141
- Configuring MAC Addresses 145
- Configuring IGMP Snooping 149
- IGMPv1 and IGMPv2 150
- IGMP Snooping Querier 151
- IGMP Forwarding 151
- 138 OL-26590-01 152
- 142 OL-26590-01 156
- CHAPTER 14 157
- 144 OL-26590-01 158
- 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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