Concept Guide

58 Virtual LANs (VLANs).............................................................................................................................. 997
Default VLAN................................................................................................................................................................. 998
Port-Based VLANs........................................................................................................................................................ 998
VLANs and Port Tagging.............................................................................................................................................. 999
Conguration Task List..................................................................................................................................................999
Creating a Port-Based VLAN.................................................................................................................................999
Assigning Interfaces to a VLAN........................................................................................................................... 1000
Moving Untagged Interfaces.................................................................................................................................1001
Assigning an IP Address to a VLAN..................................................................................................................... 1002
Conguring Native VLANs..........................................................................................................................................1002
Enabling Null VLAN as the Default VLAN................................................................................................................. 1003
59 Virtual Link Trunking (VLT).....................................................................................................................1004
Overview.......................................................................................................................................................................1004
VLT Terminology..................................................................................................................................................... 1007
Layer-2 Trac in VLT Domains.............................................................................................................................1008
Interspersed VLANs...............................................................................................................................................1009
VLT on Core Switches...........................................................................................................................................1009
Enhanced VLT......................................................................................................................................................... 1010
Congure Virtual Link Trunking.................................................................................................................................... 1011
Important Points to Remember............................................................................................................................. 1011
Conguration Notes................................................................................................................................................1012
Primary and Secondary VLT Peers.......................................................................................................................1015
RSTP and VLT.........................................................................................................................................................1016
VLT Bandwidth Monitoring....................................................................................................................................1016
VLT and Stacking....................................................................................................................................................1016
VLT and IGMP Snooping........................................................................................................................................1016
VLT IPv6...................................................................................................................................................................1017
VLT Port Delayed Restoration............................................................................................................................... 1017
PIM-Sparse Mode Support on VLT...................................................................................................................... 1017
VLT Routing ............................................................................................................................................................1019
Non-VLT ARP Sync................................................................................................................................................1022
RSTP Conguration..................................................................................................................................................... 1023
Preventing Forwarding Loops in a VLT Domain..................................................................................................1023
Sample RSTP conguration..................................................................................................................................1023
Conguring VLT......................................................................................................................................................1024
PVST+ Conguration................................................................................................................................................... 1034
Sample PVST+ Conguration............................................................................................................................... 1034
Peer Routing Conguration Example.........................................................................................................................1035
Dell-1 Switch Conguration...................................................................................................................................1036
Dell-2 Switch Conguration..................................................................................................................................1040
R1 Conguration.....................................................................................................................................................1043
Access Switch A1 Congurations and Verication.............................................................................................1044
eVLT Conguration Example...................................................................................................................................... 1045
eVLT Conguration Step Examples..................................................................................................................... 1045
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