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57 Virtual LANs (VLANs)..............................................................................................................................969
Default VLAN..................................................................................................................................................................970
Port-Based VLANs........................................................................................................................................................ 970
VLANs and Port Tagging............................................................................................................................................... 971
Conguration Task List...................................................................................................................................................971
Creating a Port-Based VLAN.................................................................................................................................. 971
Assigning Interfaces to a VLAN............................................................................................................................. 972
Moving Untagged Interfaces..................................................................................................................................973
Assigning an IP Address to a VLAN....................................................................................................................... 974
Conguring Native VLANs............................................................................................................................................974
Enabling Null VLAN as the Default VLAN...................................................................................................................975
58 Virtual Link Trunking (VLT)...................................................................................................................... 976
Overview.........................................................................................................................................................................976
VLT Terminology.......................................................................................................................................................979
Layer-2 Trac in VLT Domains.............................................................................................................................. 980
Interspersed VLANs................................................................................................................................................. 981
VLT on Core Switches............................................................................................................................................. 981
Enhanced VLT.......................................................................................................................................................... 982
Congure Virtual Link Trunking.................................................................................................................................... 983
Important Points to Remember............................................................................................................................. 983
Conguration Notes................................................................................................................................................ 984
Primary and Secondary VLT Peers........................................................................................................................ 987
RSTP and VLT.......................................................................................................................................................... 987
VLT Bandwidth Monitoring.....................................................................................................................................988
VLT and Stacking.....................................................................................................................................................988
VLT and IGMP Snooping........................................................................................................................................ 988
VLT IPv6................................................................................................................................................................... 988
VLT Port Delayed Restoration................................................................................................................................989
PIM-Sparse Mode Support on VLT.......................................................................................................................989
VLT Routing ............................................................................................................................................................. 991
Non-VLT ARP Sync................................................................................................................................................. 994
RSTP Conguration...................................................................................................................................................... 995
Preventing Forwarding Loops in a VLT Domain................................................................................................... 995
Sample RSTP Conguration...................................................................................................................................995
Conguring VLT....................................................................................................................................................... 996
PVST+ Conguration...................................................................................................................................................1006
Sample PVST+ Conguration...............................................................................................................................1006
Peer Routing Conguration Example.........................................................................................................................1007
Dell-1 Switch Conguration...................................................................................................................................1008
Dell-2 Switch Conguration...................................................................................................................................1012
R1 Conguration......................................................................................................................................................1015
Access Switch A1 Congurations and Verication..............................................................................................1016
eVLT Conguration Example....................................................................................................................................... 1017
eVLT Conguration Step Examples...................................................................................................................... 1017
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