Concept Guide
Port-Based VLANs.......................................................................................................................................................1049
VLANs and Port Tagging.............................................................................................................................................1050
Conguration Task List................................................................................................................................................1050
Creating a Port-Based VLAN............................................................................................................................... 1050
Assigning Interfaces to a VLAN............................................................................................................................ 1051
Moving Untagged Interfaces................................................................................................................................1052
Assigning an IP Address to a VLAN..................................................................................................................... 1053
Conguring Native VLANs..........................................................................................................................................1053
Enabling Null VLAN as the Default VLAN................................................................................................................. 1054
63 Virtual Link Trunking (VLT).....................................................................................................................1055
Overview.......................................................................................................................................................................1055
VLT Terminology.....................................................................................................................................................1058
Layer-2 Trac in VLT Domains.............................................................................................................................1059
Interspersed VLANs...............................................................................................................................................1060
VLT on Core Switches...........................................................................................................................................1060
Enhanced VLT......................................................................................................................................................... 1061
Congure Virtual Link Trunking.................................................................................................................................. 1062
Important Points to Remember............................................................................................................................1062
Conguration Notes...............................................................................................................................................1063
Primary and Secondary VLT Peers...................................................................................................................... 1066
RSTP and VLT.........................................................................................................................................................1067
VLT Bandwidth Monitoring................................................................................................................................... 1067
VLT and Stacking....................................................................................................................................................1067
VLT and IGMP Snooping....................................................................................................................................... 1067
VLT IPv6..................................................................................................................................................................1068
VLT Port Delayed Restoration.............................................................................................................................. 1068
PIM-Sparse Mode Support on VLT..................................................................................................................... 1068
VLT Routing ........................................................................................................................................................... 1070
Non-VLT ARP Sync................................................................................................................................................1073
RSTP Conguration......................................................................................................................................................1074
Preventing Forwarding Loops in a VLT Domain.................................................................................................. 1074
Sample RSTP conguration.................................................................................................................................. 1074
Conguring VLT......................................................................................................................................................1075
PVST+ Conguration...................................................................................................................................................1085
Sample PVST+ Conguration............................................................................................................................... 1086
Peer Routing Conguration Example.........................................................................................................................1086
Dell-1 Switch Conguration................................................................................................................................... 1087
Dell-2 Switch Conguration...................................................................................................................................1091
R1 Conguration.....................................................................................................................................................1094
Access Switch A1 Congurations and Verication.............................................................................................1095
eVLT Conguration Example...................................................................................................................................... 1096
eVLT Conguration Step Examples..................................................................................................................... 1096
PIM-Sparse Mode Conguration Example............................................................................................................... 1098
Verifying a VLT Conguration.....................................................................................................................................1099
Additional VLT Sample Congurations....................................................................................................................... 1102
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