Concept Guide

Layer-2 Trac in VLT Domains..............................................................................................................................1077
Interspersed VLANs............................................................................................................................................... 1078
VLT on Core Switches........................................................................................................................................... 1078
Enhanced VLT.........................................................................................................................................................1079
Congure Virtual Link Trunking.................................................................................................................................. 1080
Important Points to Remember............................................................................................................................1080
Conguration Notes................................................................................................................................................1081
Primary and Secondary VLT Peers...................................................................................................................... 1084
RSTP and VLT........................................................................................................................................................ 1085
VLT Bandwidth Monitoring...................................................................................................................................1085
VLT and Stacking................................................................................................................................................... 1085
VLT and IGMP Snooping.......................................................................................................................................1085
VLT IPv6..................................................................................................................................................................1086
VLT Port Delayed Restoration.............................................................................................................................. 1086
PIM-Sparse Mode Support on VLT..................................................................................................................... 1086
VLT Routing ........................................................................................................................................................... 1088
Non-VLT ARP Sync................................................................................................................................................ 1091
RSTP Conguration.....................................................................................................................................................1092
Preventing Forwarding Loops in a VLT Domain..................................................................................................1092
Sample RSTP conguration..................................................................................................................................1092
Conguring VLT......................................................................................................................................................1093
PVST+ Conguration....................................................................................................................................................1103
Sample PVST+ Conguration................................................................................................................................1104
Peer Routing Conguration Example......................................................................................................................... 1104
Dell-1 Switch Conguration....................................................................................................................................1105
Dell-2 Switch Conguration...................................................................................................................................1109
R1 Conguration.......................................................................................................................................................1112
Access Switch A1 Congurations and Verication...............................................................................................1113
eVLT Conguration Example........................................................................................................................................ 1114
eVLT Conguration Step Examples.......................................................................................................................1114
PIM-Sparse Mode Conguration Example.................................................................................................................1116
Verifying a VLT Conguration.......................................................................................................................................1117
Additional VLT Sample Congurations....................................................................................................................... 1120
Troubleshooting VLT..................................................................................................................................................... 1122
Reconguring Stacked Switches as VLT................................................................................................................... 1123
Specifying VLT Nodes in a PVLAN............................................................................................................................. 1123
Association of VLTi as a Member of a PVLAN....................................................................................................1124
MAC Synchronization for VLT Nodes in a PVLAN..............................................................................................1124
PVLAN Operations When One VLT Peer is Down..............................................................................................1125
PVLAN Operations When a VLT Peer is Restarted............................................................................................ 1125
Interoperation of VLT Nodes in a PVLAN with ARP Requests..........................................................................1125
Scenarios for VLAN Membership and MAC Synchronization With VLT Nodes in PVLAN........................... 1125
Conguring a VLT VLAN or LAG in a PVLAN............................................................................................................1127
Creating a VLT LAG or a VLT VLAN..................................................................................................................... 1127
Associating the VLT LAG or VLT VLAN in a PVLAN.......................................................................................... 1128
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