Setup Guide
59 Virtual Link Trunking (VLT)..................................................................................................................... 1024
Overview....................................................................................................................................................................... 1024
VLT Terminology..................................................................................................................................................... 1027
Layer-2 Trac in VLT Domains............................................................................................................................. 1028
Interspersed VLANs...............................................................................................................................................1029
VLT on Core Switches........................................................................................................................................... 1029
Enhanced VLT........................................................................................................................................................ 1030
Congure Virtual Link Trunking................................................................................................................................... 1031
Important Points to Remember.............................................................................................................................1031
Conguration Notes...............................................................................................................................................1032
Primary and Secondary VLT Peers...................................................................................................................... 1035
RSTP and VLT........................................................................................................................................................ 1036
VLT Bandwidth Monitoring................................................................................................................................... 1036
VLT and Stacking................................................................................................................................................... 1036
VLT and IGMP Snooping.......................................................................................................................................1036
VLT IPv6.................................................................................................................................................................. 1037
VLT Port Delayed Restoration...............................................................................................................................1037
PIM-Sparse Mode Support on VLT......................................................................................................................1037
VLT Routing ........................................................................................................................................................... 1039
Non-VLT ARP Sync................................................................................................................................................1042
RSTP Conguration.....................................................................................................................................................1043
Preventing Forwarding Loops in a VLT Domain..................................................................................................1043
Sample RSTP conguration..................................................................................................................................1043
Conguring VLT......................................................................................................................................................1044
PVST+ Conguration...................................................................................................................................................1054
Sample PVST+ Conguration............................................................................................................................... 1054
Peer Routing Conguration Example........................................................................................................................ 1055
Dell-1 Switch Conguration...................................................................................................................................1056
Dell-2 Switch Conguration..................................................................................................................................1060
R1 Conguration.....................................................................................................................................................1063
Access Switch A1 Congurations and Verication.............................................................................................1064
eVLT Conguration Example...................................................................................................................................... 1065
eVLT Conguration Step Examples..................................................................................................................... 1065
PIM-Sparse Mode Conguration Example................................................................................................................1067
Verifying a VLT Conguration.....................................................................................................................................1068
Additional VLT Sample Congurations........................................................................................................................1071
Troubleshooting VLT.....................................................................................................................................................1073
Reconguring Stacked Switches as VLT...................................................................................................................1074
Specifying VLT Nodes in a PVLAN.............................................................................................................................1074
Association of VLTi as a Member of a PVLAN................................................................................................... 1075
MAC Synchronization for VLT Nodes in a PVLAN.............................................................................................1075
PVLAN Operations When One VLT Peer is Down............................................................................................. 1076
PVLAN Operations When a VLT Peer is Restarted............................................................................................1076
Interoperation of VLT Nodes in a PVLAN with ARP Requests.........................................................................1076
Scenarios for VLAN Membership and MAC Synchronization With VLT Nodes in PVLAN...........................1076
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