Concept Guide

VLT Terminology......................................................................................................................................................1015
Layer-2 Trac in VLT Domains..............................................................................................................................1016
Interspersed VLANs................................................................................................................................................1017
VLT on Core Switches............................................................................................................................................1017
Enhanced VLT......................................................................................................................................................... 1018
Congure Virtual Link Trunking................................................................................................................................... 1019
Important Points to Remember.............................................................................................................................1019
Conguration Notes...............................................................................................................................................1020
Primary and Secondary VLT Peers.......................................................................................................................1023
RSTP and VLT........................................................................................................................................................ 1024
VLT Bandwidth Monitoring................................................................................................................................... 1024
VLT and Stacking....................................................................................................................................................1024
VLT and IGMP Snooping....................................................................................................................................... 1024
VLT IPv6..................................................................................................................................................................1025
VLT Port Delayed Restoration.............................................................................................................................. 1025
PIM-Sparse Mode Support on VLT..................................................................................................................... 1025
VLT Routing ............................................................................................................................................................1027
Non-VLT ARP Sync................................................................................................................................................1030
RSTP Conguration......................................................................................................................................................1031
Preventing Forwarding Loops in a VLT Domain...................................................................................................1031
Sample RSTP conguration...................................................................................................................................1031
Conguring VLT......................................................................................................................................................1032
PVST+ Conguration................................................................................................................................................... 1042
Sample PVST+ Conguration............................................................................................................................... 1042
Peer Routing Conguration Example.........................................................................................................................1043
Dell-1 Switch Conguration...................................................................................................................................1044
Dell-2 Switch Conguration.................................................................................................................................. 1048
R1 Conguration......................................................................................................................................................1051
Access Switch A1 Congurations and Verication.............................................................................................1052
eVLT Conguration Example...................................................................................................................................... 1053
eVLT Conguration Step Examples..................................................................................................................... 1053
PIM-Sparse Mode Conguration Example............................................................................................................... 1055
Verifying a VLT Conguration.....................................................................................................................................1056
Additional VLT Sample Congurations...................................................................................................................... 1059
Troubleshooting VLT..................................................................................................................................................... 1061
Reconguring Stacked Switches as VLT.................................................................................................................. 1062
Specifying VLT Nodes in a PVLAN............................................................................................................................ 1062
Association of VLTi as a Member of a PVLAN................................................................................................... 1063
MAC Synchronization for VLT Nodes in a PVLAN.............................................................................................1063
PVLAN Operations When One VLT Peer is Down............................................................................................. 1064
PVLAN Operations When a VLT Peer is Restarted........................................................................................... 1064
Interoperation of VLT Nodes in a PVLAN with ARP Requests.........................................................................1064
Scenarios for VLAN Membership and MAC Synchronization With VLT Nodes in PVLAN...........................1064
Conguring a VLT VLAN or LAG in a PVLAN...........................................................................................................1066
Creating a VLT LAG or a VLT VLAN.................................................................................................................... 1066
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