Concept Guide

59 Virtual Link Trunking (VLT)..................................................................................................................... 1022
Overview....................................................................................................................................................................... 1022
VLT Terminology.....................................................................................................................................................1025
Layer-2 Trac in VLT Domains............................................................................................................................. 1026
Interspersed VLANs............................................................................................................................................... 1027
VLT on Core Switches........................................................................................................................................... 1027
Enhanced VLT.........................................................................................................................................................1028
Congure Virtual Link Trunking...................................................................................................................................1029
Important Points to Remember............................................................................................................................1029
Conguration Notes...............................................................................................................................................1030
Primary and Secondary VLT Peers...................................................................................................................... 1033
RSTP and VLT........................................................................................................................................................ 1034
VLT Bandwidth Monitoring................................................................................................................................... 1034
VLT and Stacking................................................................................................................................................... 1034
VLT and IGMP Snooping....................................................................................................................................... 1034
VLT IPv6..................................................................................................................................................................1035
VLT Port Delayed Restoration.............................................................................................................................. 1035
PIM-Sparse Mode Support on VLT..................................................................................................................... 1035
VLT Routing ............................................................................................................................................................1037
Non-VLT ARP Sync................................................................................................................................................1040
RSTP Conguration......................................................................................................................................................1041
Preventing Forwarding Loops in a VLT Domain.................................................................................................. 1041
Sample RSTP conguration...................................................................................................................................1041
Conguring VLT......................................................................................................................................................1042
PVST+ Conguration...................................................................................................................................................1052
Sample PVST+ Conguration............................................................................................................................... 1052
Peer Routing Conguration Example.........................................................................................................................1053
Dell-1 Switch Conguration...................................................................................................................................1054
Dell-2 Switch Conguration..................................................................................................................................1058
R1 Conguration......................................................................................................................................................1061
Access Switch A1 Congurations and Verication.............................................................................................1062
eVLT Conguration Example...................................................................................................................................... 1063
eVLT Conguration Step Examples..................................................................................................................... 1063
PIM-Sparse Mode Conguration Example............................................................................................................... 1065
Verifying a VLT Conguration.....................................................................................................................................1066
Additional VLT Sample Congurations...................................................................................................................... 1069
Troubleshooting VLT..................................................................................................................................................... 1071
Reconguring Stacked Switches as VLT...................................................................................................................1072
Specifying VLT Nodes in a PVLAN.............................................................................................................................1072
Association of VLTi as a Member of a PVLAN................................................................................................... 1073
MAC Synchronization for VLT Nodes in a PVLAN.............................................................................................1073
PVLAN Operations When One VLT Peer is Down..............................................................................................1074
PVLAN Operations When a VLT Peer is Restarted............................................................................................1074
Interoperation of VLT Nodes in a PVLAN with ARP Requests......................................................................... 1074
Scenarios for VLAN Membership and MAC Synchronization With VLT Nodes in PVLAN........................... 1074
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