Concept Guide

Conguration Task List................................................................................................................................................. 990
Creating a Port-Based VLAN.................................................................................................................................990
Assigning Interfaces to a VLAN..............................................................................................................................991
Moving Untagged Interfaces..................................................................................................................................992
Assigning an IP Address to a VLAN.......................................................................................................................993
Conguring Native VLANs........................................................................................................................................... 993
Enabling Null VLAN as the Default VLAN...................................................................................................................994
59 Virtual Link Trunking (VLT)...................................................................................................................... 995
Overview........................................................................................................................................................................ 995
VLT Terminology...................................................................................................................................................... 998
Layer-2 Trac in VLT Domains.............................................................................................................................. 999
Interspersed VLANs...............................................................................................................................................1000
VLT on Core Switches...........................................................................................................................................1000
Enhanced VLT......................................................................................................................................................... 1001
Congure Virtual Link Trunking.................................................................................................................................. 1002
Important Points to Remember............................................................................................................................1002
Conguration Notes...............................................................................................................................................1003
Primary and Secondary VLT Peers...................................................................................................................... 1006
RSTP and VLT........................................................................................................................................................ 1007
VLT Bandwidth Monitoring................................................................................................................................... 1007
VLT and Stacking....................................................................................................................................................1007
VLT and IGMP Snooping....................................................................................................................................... 1007
VLT IPv6..................................................................................................................................................................1008
VLT Port Delayed Restoration.............................................................................................................................. 1008
PIM-Sparse Mode Support on VLT..................................................................................................................... 1008
VLT Routing ............................................................................................................................................................1010
Non-VLT ARP Sync................................................................................................................................................ 1013
RSTP Conguration......................................................................................................................................................1014
Preventing Forwarding Loops in a VLT Domain.................................................................................................. 1014
Sample RSTP conguration...................................................................................................................................1014
Conguring VLT...................................................................................................................................................... 1015
PVST+ Conguration................................................................................................................................................... 1025
Sample PVST+ Conguration............................................................................................................................... 1026
Peer Routing Conguration Example.........................................................................................................................1026
Dell-1 Switch Conguration................................................................................................................................... 1027
Dell-2 Switch Conguration...................................................................................................................................1031
R1 Conguration..................................................................................................................................................... 1034
Access Switch A1 Congurations and Verication.............................................................................................1035
eVLT Conguration Example...................................................................................................................................... 1036
eVLT Conguration Step Examples..................................................................................................................... 1036
PIM-Sparse Mode Conguration Example................................................................................................................1038
Verifying a VLT Conguration.....................................................................................................................................1039
Additional VLT Sample Congurations.......................................................................................................................1042
Troubleshooting VLT.................................................................................................................................................... 1044
Reconguring Stacked Switches as VLT.................................................................................................................. 1045
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