Administrator Guide

61 Virtual Link Trunking (VLT)....................................................................................................................... 973
Overview.........................................................................................................................................................................973
VLT Terminology.......................................................................................................................................................976
Layer-2 Trac in VLT Domains............................................................................................................................... 977
Interspersed VLANs.................................................................................................................................................978
VLT on Core Switches.............................................................................................................................................978
Enhanced VLT.......................................................................................................................................................... 979
Congure Virtual Link Trunking....................................................................................................................................980
Important Points to Remember............................................................................................................................. 980
Conguration Notes.................................................................................................................................................981
Primary and Secondary VLT Peers........................................................................................................................984
RSTP and VLT..........................................................................................................................................................984
VLT Bandwidth Monitoring.....................................................................................................................................985
VLT and Stacking.....................................................................................................................................................985
VLT and IGMP Snooping........................................................................................................................................ 985
VLT IPv6................................................................................................................................................................... 985
VLT Port Delayed Restoration................................................................................................................................986
PIM-Sparse Mode Support on VLT.......................................................................................................................986
VLT Routing .............................................................................................................................................................988
Non-VLT ARP Sync..................................................................................................................................................991
RSTP Conguration.......................................................................................................................................................992
Preventing Forwarding Loops in a VLT Domain................................................................................................... 992
Sample RSTP Conguration...................................................................................................................................992
Conguring VLT....................................................................................................................................................... 993
PVST+ Conguration...................................................................................................................................................1003
Sample PVST+ Conguration............................................................................................................................... 1003
Peer Routing Conguration Example.........................................................................................................................1004
Dell-1 Switch Conguration...................................................................................................................................1005
Dell-2 Switch Conguration..................................................................................................................................1009
R1 Conguration......................................................................................................................................................1012
Access Switch A1 Congurations and Verication..............................................................................................1013
eVLT Conguration Example....................................................................................................................................... 1014
eVLT Conguration Step Examples...................................................................................................................... 1014
PIM-Sparse Mode Conguration Example................................................................................................................ 1016
Verifying a VLT Conguration......................................................................................................................................1017
Additional VLT Sample Congurations.......................................................................................................................1020
Troubleshooting VLT.................................................................................................................................................... 1022
Reconguring Stacked Switches as VLT...................................................................................................................1023
Specifying VLT Nodes in a PVLAN............................................................................................................................ 1023
Association of VLTi as a Member of a PVLAN................................................................................................... 1024
MAC Synchronization for VLT Nodes in a PVLAN.............................................................................................1024
PVLAN Operations When One VLT Peer is Down............................................................................................. 1025
PVLAN Operations When a VLT Peer is Restarted........................................................................................... 1025
Interoperation of VLT Nodes in a PVLAN with ARP Requests.........................................................................1025
Scenarios for VLAN Membership and MAC Synchronization With VLT Nodes in PVLAN...........................1025
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