Concept Guide
61 Virtual LANs (VLANs)............................................................................................................................. 1054
Default VLAN................................................................................................................................................................1055
Port-Based VLANs...................................................................................................................................................... 1055
VLANs and Port Tagging.............................................................................................................................................1056
Conguration Task List................................................................................................................................................1056
Creating a Port-Based VLAN............................................................................................................................... 1056
Assigning Interfaces to a VLAN............................................................................................................................1057
Moving Untagged Interfaces................................................................................................................................1058
Assigning an IP Address to a VLAN..................................................................................................................... 1059
Conguring Native VLANs..........................................................................................................................................1059
Enabling Null VLAN as the Default VLAN.................................................................................................................1060
62 Virtual Link Trunking (VLT)..................................................................................................................... 1061
Overview........................................................................................................................................................................1061
VLT Terminology.....................................................................................................................................................1064
Layer-2 Trac in VLT Domains.............................................................................................................................1065
Interspersed VLANs...............................................................................................................................................1066
VLT on Core Switches...........................................................................................................................................1066
Enhanced VLT.........................................................................................................................................................1067
Congure Virtual Link Trunking.................................................................................................................................. 1068
Important Points to Remember............................................................................................................................1068
Conguration Notes...............................................................................................................................................1069
Primary and Secondary VLT Peers.......................................................................................................................1072
RSTP and VLT.........................................................................................................................................................1073
VLT Bandwidth Monitoring................................................................................................................................... 1073
VLT and Stacking....................................................................................................................................................1073
VLT and IGMP Snooping....................................................................................................................................... 1073
VLT IPv6.................................................................................................................................................................. 1074
VLT Port Delayed Restoration...............................................................................................................................1074
PIM-Sparse Mode Support on VLT......................................................................................................................1074
VLT Routing ........................................................................................................................................................... 1076
Non-VLT ARP Sync................................................................................................................................................1079
RSTP Conguration.....................................................................................................................................................1080
Preventing Forwarding Loops in a VLT Domain..................................................................................................1080
Sample RSTP conguration..................................................................................................................................1080
Conguring VLT...................................................................................................................................................... 1081
PVST+ Conguration....................................................................................................................................................1091
Sample PVST+ Conguration............................................................................................................................... 1092
Peer Routing Conguration Example.........................................................................................................................1092
Dell-1 Switch Conguration...................................................................................................................................1093
Dell-2 Switch Conguration.................................................................................................................................. 1097
R1 Conguration......................................................................................................................................................1100
Access Switch A1 Congurations and Verication.............................................................................................. 1101
eVLT Conguration Example....................................................................................................................................... 1102
eVLT Conguration Step Examples...................................................................................................................... 1102
32
Contents